Peter Velguth - Academia.edu (original) (raw)

Papers by Peter Velguth

Research paper thumbnail of Taxonomy of Mexican and Central American Members of Solanum Series Conicibaccata (sect. Petota)

Zenodo (CERN European Organization for Nuclear Research), Oct 1, 2001

Members of Solanum series Conicibaccata in Mexico and Central America are very similar. All are t... more Members of Solanum series Conicibaccata in Mexico and Central America are very similar. All are tetraploids (2n ϭ 4x ϭ 48). Recent authors have recognized three or four species: S. agrimonifolium, S. woodsonii, S. longiconicum (sometimes included in the next), and S. oxycarpum. We had difficulty distinguishing these species in the herbarium, and needed to resolve species boundaries for ongoing floristic studies. We studied this group in the field throughout Mexico, Guatemala, Costa Rica, and Panama, grew collections in the greenhouse, studied herbarium specimens, determined ploidy levels through flow cytometry, and generated molecular data using Random Amplified Polymorphic DNA. Molecular data distinguish S. agrimonifolium, S. longiconicum, and S. oxycarpum. Solanum woodsonii was not available for molecular analysis. All four species can be distinguished morphologically, but only by leaf character states that overlap in range, by pubescence differences that are best observed in living specimens, and by a seed spot character that is only evident on living or recently gathered specimens.

Research paper thumbnail of Day/night temperature environment affects cell elongation but not division in Lilium longiflorum Thunb

Journal of Experimental Botany, 1994

Lilium longiflorum Thunb. cv. 'Nellie White' plants were grown in different day/night temperature... more Lilium longiflorum Thunb. cv. 'Nellie White' plants were grown in different day/night temperature (DT/NT) environments to determine the anatomical basis for differential responses of stem elongation to DT and NT. Lilium plants were forced in 1986 and 1987 under 25 and 12 different DT/NT environments, respectively, with temperatures ranging from 14 to 30°C. Parenchyma and epidermal cell length and width were measured in stem tissue (1987) and epidermal cell length and width were measured in leaf tissue (1986). Total cell number per internode and vertical cell number per internode were calculated. Stem parenchyma and stem and leaf epidermal cell length increased linearly as the difference (DIF) between DT and NT increased (DIF= DT-NT), i.e. as DT increased relative to NT. DIF had no effect on stem parenchyma width, stem and leaf epidermal cell width, or cell number per internode. Data suggested that stem elongation responses to DIF are elicited primarily through effects on cell elongation and not division.

Research paper thumbnail of Documentation of Genetic Differences in a Volunteer Grass, Poa annua (Annual Meadowgrass), under Different Conditions of Golf Course Turf, and Implications for Urban Landscape Plant Selection and Management

Springer eBooks, 1998

Poa annua, commonly known as annual meadowgrass or annual bluegrass, is worldwide in distribution... more Poa annua, commonly known as annual meadowgrass or annual bluegrass, is worldwide in distribution (Beard et al. 1978), and is one of the ten most abundant weeds in city allotment gardens (Gilbert 1989). Plants range from an annual bunching habit to a prostrate creeping plant that roots at nodes and tends to be perennial (Beard et al. 1978; Gibeault and Goetze 1972). Particular forms have been found in association with specific habitats and several studies have suggested that differences in populations have a genetic basis.

Research paper thumbnail of Observation on the reproductive biology in Poa annua L

Research paper thumbnail of Use of Flow Cytometric Measurement of Nuclear DNA Content to Assess Ploidy Level in Azalea

Hortscience, Aug 1, 1996

To determine when a paper is to be presented, check the session number in the Program Schedule or... more To determine when a paper is to be presented, check the session number in the Program Schedule or the Conference at a Glance charts. The Author presenting the paper is indicated by an asterisk.

Research paper thumbnail of Diurnal Variations in Temperature Affect Cellular Elongation but Not Division

Hortscience, 1991

Page 1. ABSTRACTS Colloquia Workshops Contributed Papers (Oral and Poster) 88th Annual Meeting of... more Page 1. ABSTRACTS Colloquia Workshops Contributed Papers (Oral and Poster) 88th Annual Meeting of the American Society for Horticultural Science University Park, Pa. 19-24 July 1991 The Abstracts that follow are arranged in numerical sequence by the abstract number. ...

Research paper thumbnail of Diurnal Variations in Temperature Affect Cellular Elongation but Not Division

HortScience, 1991

Page 1. ABSTRACTS Colloquia Workshops Contributed Papers (Oral and Poster) 88th Annual Meeting of... more Page 1. ABSTRACTS Colloquia Workshops Contributed Papers (Oral and Poster) 88th Annual Meeting of the American Society for Horticultural Science University Park, Pa. 19-24 July 1991 The Abstracts that follow are arranged in numerical sequence by the abstract number. ...

Research paper thumbnail of Documentation of Genetic Differences in a Volunteer Grass, Poa annua (Annual Meadowgrass), under Different Conditions of Golf Course Turf, and Implications for Urban Landscape Plant Selection and Management

Research paper thumbnail of Taxonomy of Mexican and Central American Members of Solanum series Conicibaccata (sect. Petota)

Syst Bot, 2001

Members of Solanum series Conicibaccata in Mexico and Central America are very similar. All are t... more Members of Solanum series Conicibaccata in Mexico and Central America are very similar. All are tetraploids (2n ϭ 4x ϭ 48). Recent authors have recognized three or four species: S. agrimonifolium, S. woodsonii, S. longiconicum (sometimes included in the next), and S. oxycarpum. We had difficulty distinguishing these species in the herbarium, and needed to resolve species boundaries for ongoing floristic studies. We studied this group in the field throughout Mexico, Guatemala, Costa Rica, and Panama, grew collections in the greenhouse, studied herbarium specimens, determined ploidy levels through flow cytometry, and generated molecular data using Random Amplified Polymorphic DNA. Molecular data distinguish S. agrimonifolium, S. longiconicum, and S. oxycarpum. Solanum woodsonii was not available for molecular analysis. All four species can be distinguished morphologically, but only by leaf character states that overlap in range, by pubescence differences that are best observed in living specimens, and by a seed spot character that is only evident on living or recently gathered specimens.

Research paper thumbnail of Use of Flow Cytometric Measurement of Nuclear DNA Content to Assess Ploidy Level in Azalea

Research paper thumbnail of Taxonomy of Mexican and Central American members of Solanum series Conicibaccata (sect. Petota)

Members of Solanum series Conicibaccata in Mexico and Central America are very similar. All are t... more Members of Solanum series Conicibaccata in Mexico and Central America are very similar. All are tetraploids (2n = 4x = 48). Recent authors have recognized three or four species: S. agrimonifolium, S. woodsonii, S. longiconicum (sometimes included in the next), and S. oxycarpum. We had difficulty distinguishing these species in the herbarium, and needed to resolve species boundaries for ongoing floristic studies. We studied this group in the field throughout Mexico, Guatemala, Costa Rica, and Panama, grew collections in the greenhouse, studied herbarium specimens, determined ploidy levels through flow cytometry, and generated molecular data using Random Amplified Polymorphic DNA. Molecular data distinguish S. agrimonifolium, S. longiconicum, and S. oxycarpum. Solanum woodsonii was not available for molecular analysis. All four species can be distinguished morphologically, but only by leaf character states that overlap in range, by pubescence differences that are best observed in livi...

Research paper thumbnail of Day/night temperature environment affects cell elongation but not division in Lilium longiflorum Thunb

Journal of Experimental Botany, 1994

Abstract Lilium tongiflorum Thunb. cv.'Nellie White'plants were grown in differ... more Abstract Lilium tongiflorum Thunb. cv.'Nellie White'plants were grown in different day/night temperature (DT/NT) environments to determine the anatomical basis for differential responses of stem elongation to DT and NT. Lilium plants were forced in 1986 and 1987 ...

Research paper thumbnail of Taxonomy of Mexican and Central American members of Solanum Series Conicibaccata (sect. Petota)

Systematic botany, 2001

Members of Solanum series Conicibaccata in Mexico and Central America are very similar. All are t... more Members of Solanum series Conicibaccata in Mexico and Central America are very similar. All are tetraploids (2n ϭ 4x ϭ 48). Recent authors have recognized three or four species: S. agrimonifolium, S. woodsonii, S. longiconicum (sometimes included in the next), and S. oxycarpum. We had difficulty distinguishing these species in the herbarium, and needed to resolve species boundaries for ongoing floristic studies. We studied this group in the field throughout Mexico, Guatemala, Costa Rica, and Panama, grew collections in the greenhouse, studied herbarium specimens, determined ploidy levels through flow cytometry, and generated molecular data using Random Amplified Polymorphic DNA. Molecular data distinguish S. agrimonifolium, S. longiconicum, and S. oxycarpum. Solanum woodsonii was not available for molecular analysis. All four species can be distinguished morphologically, but only by leaf character states that overlap in range, by pubescence differences that are best observed in living specimens, and by a seed spot character that is only evident on living or recently gathered specimens.

Research paper thumbnail of Diurnal Variations in Temperature Affect Cellular Elongation but Not Division

Hortscience, Jun 1, 1991

The Abstracts that follow are arranged in numerical sequence by the abstract number. For Poster S... more The Abstracts that follow are arranged in numerical sequence by the abstract number. For Poster Sessions, session numbers (in parentheses) follow the abstract numbers. Example: 003 (PS 1) represents abstract 003 in Poster Session 2; 304 (PS 14) represents abstract 304 in Poster Session 14. .

Research paper thumbnail of Taxonomy of Mexican and Central American Members of Solanum Series Conicibaccata (sect. Petota)

Zenodo (CERN European Organization for Nuclear Research), Oct 1, 2001

Members of Solanum series Conicibaccata in Mexico and Central America are very similar. All are t... more Members of Solanum series Conicibaccata in Mexico and Central America are very similar. All are tetraploids (2n ϭ 4x ϭ 48). Recent authors have recognized three or four species: S. agrimonifolium, S. woodsonii, S. longiconicum (sometimes included in the next), and S. oxycarpum. We had difficulty distinguishing these species in the herbarium, and needed to resolve species boundaries for ongoing floristic studies. We studied this group in the field throughout Mexico, Guatemala, Costa Rica, and Panama, grew collections in the greenhouse, studied herbarium specimens, determined ploidy levels through flow cytometry, and generated molecular data using Random Amplified Polymorphic DNA. Molecular data distinguish S. agrimonifolium, S. longiconicum, and S. oxycarpum. Solanum woodsonii was not available for molecular analysis. All four species can be distinguished morphologically, but only by leaf character states that overlap in range, by pubescence differences that are best observed in living specimens, and by a seed spot character that is only evident on living or recently gathered specimens.

Research paper thumbnail of Day/night temperature environment affects cell elongation but not division in Lilium longiflorum Thunb

Journal of Experimental Botany, 1994

Lilium longiflorum Thunb. cv. 'Nellie White' plants were grown in different day/night temperature... more Lilium longiflorum Thunb. cv. 'Nellie White' plants were grown in different day/night temperature (DT/NT) environments to determine the anatomical basis for differential responses of stem elongation to DT and NT. Lilium plants were forced in 1986 and 1987 under 25 and 12 different DT/NT environments, respectively, with temperatures ranging from 14 to 30°C. Parenchyma and epidermal cell length and width were measured in stem tissue (1987) and epidermal cell length and width were measured in leaf tissue (1986). Total cell number per internode and vertical cell number per internode were calculated. Stem parenchyma and stem and leaf epidermal cell length increased linearly as the difference (DIF) between DT and NT increased (DIF= DT-NT), i.e. as DT increased relative to NT. DIF had no effect on stem parenchyma width, stem and leaf epidermal cell width, or cell number per internode. Data suggested that stem elongation responses to DIF are elicited primarily through effects on cell elongation and not division.

Research paper thumbnail of Documentation of Genetic Differences in a Volunteer Grass, Poa annua (Annual Meadowgrass), under Different Conditions of Golf Course Turf, and Implications for Urban Landscape Plant Selection and Management

Springer eBooks, 1998

Poa annua, commonly known as annual meadowgrass or annual bluegrass, is worldwide in distribution... more Poa annua, commonly known as annual meadowgrass or annual bluegrass, is worldwide in distribution (Beard et al. 1978), and is one of the ten most abundant weeds in city allotment gardens (Gilbert 1989). Plants range from an annual bunching habit to a prostrate creeping plant that roots at nodes and tends to be perennial (Beard et al. 1978; Gibeault and Goetze 1972). Particular forms have been found in association with specific habitats and several studies have suggested that differences in populations have a genetic basis.

Research paper thumbnail of Observation on the reproductive biology in Poa annua L

Research paper thumbnail of Use of Flow Cytometric Measurement of Nuclear DNA Content to Assess Ploidy Level in Azalea

Hortscience, Aug 1, 1996

To determine when a paper is to be presented, check the session number in the Program Schedule or... more To determine when a paper is to be presented, check the session number in the Program Schedule or the Conference at a Glance charts. The Author presenting the paper is indicated by an asterisk.

Research paper thumbnail of Diurnal Variations in Temperature Affect Cellular Elongation but Not Division

Hortscience, 1991

Page 1. ABSTRACTS Colloquia Workshops Contributed Papers (Oral and Poster) 88th Annual Meeting of... more Page 1. ABSTRACTS Colloquia Workshops Contributed Papers (Oral and Poster) 88th Annual Meeting of the American Society for Horticultural Science University Park, Pa. 19-24 July 1991 The Abstracts that follow are arranged in numerical sequence by the abstract number. ...

Research paper thumbnail of Diurnal Variations in Temperature Affect Cellular Elongation but Not Division

HortScience, 1991

Page 1. ABSTRACTS Colloquia Workshops Contributed Papers (Oral and Poster) 88th Annual Meeting of... more Page 1. ABSTRACTS Colloquia Workshops Contributed Papers (Oral and Poster) 88th Annual Meeting of the American Society for Horticultural Science University Park, Pa. 19-24 July 1991 The Abstracts that follow are arranged in numerical sequence by the abstract number. ...

Research paper thumbnail of Documentation of Genetic Differences in a Volunteer Grass, Poa annua (Annual Meadowgrass), under Different Conditions of Golf Course Turf, and Implications for Urban Landscape Plant Selection and Management

Research paper thumbnail of Taxonomy of Mexican and Central American Members of Solanum series Conicibaccata (sect. Petota)

Syst Bot, 2001

Members of Solanum series Conicibaccata in Mexico and Central America are very similar. All are t... more Members of Solanum series Conicibaccata in Mexico and Central America are very similar. All are tetraploids (2n ϭ 4x ϭ 48). Recent authors have recognized three or four species: S. agrimonifolium, S. woodsonii, S. longiconicum (sometimes included in the next), and S. oxycarpum. We had difficulty distinguishing these species in the herbarium, and needed to resolve species boundaries for ongoing floristic studies. We studied this group in the field throughout Mexico, Guatemala, Costa Rica, and Panama, grew collections in the greenhouse, studied herbarium specimens, determined ploidy levels through flow cytometry, and generated molecular data using Random Amplified Polymorphic DNA. Molecular data distinguish S. agrimonifolium, S. longiconicum, and S. oxycarpum. Solanum woodsonii was not available for molecular analysis. All four species can be distinguished morphologically, but only by leaf character states that overlap in range, by pubescence differences that are best observed in living specimens, and by a seed spot character that is only evident on living or recently gathered specimens.

Research paper thumbnail of Use of Flow Cytometric Measurement of Nuclear DNA Content to Assess Ploidy Level in Azalea

Research paper thumbnail of Taxonomy of Mexican and Central American members of Solanum series Conicibaccata (sect. Petota)

Members of Solanum series Conicibaccata in Mexico and Central America are very similar. All are t... more Members of Solanum series Conicibaccata in Mexico and Central America are very similar. All are tetraploids (2n = 4x = 48). Recent authors have recognized three or four species: S. agrimonifolium, S. woodsonii, S. longiconicum (sometimes included in the next), and S. oxycarpum. We had difficulty distinguishing these species in the herbarium, and needed to resolve species boundaries for ongoing floristic studies. We studied this group in the field throughout Mexico, Guatemala, Costa Rica, and Panama, grew collections in the greenhouse, studied herbarium specimens, determined ploidy levels through flow cytometry, and generated molecular data using Random Amplified Polymorphic DNA. Molecular data distinguish S. agrimonifolium, S. longiconicum, and S. oxycarpum. Solanum woodsonii was not available for molecular analysis. All four species can be distinguished morphologically, but only by leaf character states that overlap in range, by pubescence differences that are best observed in livi...

Research paper thumbnail of Day/night temperature environment affects cell elongation but not division in Lilium longiflorum Thunb

Journal of Experimental Botany, 1994

Abstract Lilium tongiflorum Thunb. cv.'Nellie White'plants were grown in differ... more Abstract Lilium tongiflorum Thunb. cv.'Nellie White'plants were grown in different day/night temperature (DT/NT) environments to determine the anatomical basis for differential responses of stem elongation to DT and NT. Lilium plants were forced in 1986 and 1987 ...

Research paper thumbnail of Taxonomy of Mexican and Central American members of Solanum Series Conicibaccata (sect. Petota)

Systematic botany, 2001

Members of Solanum series Conicibaccata in Mexico and Central America are very similar. All are t... more Members of Solanum series Conicibaccata in Mexico and Central America are very similar. All are tetraploids (2n ϭ 4x ϭ 48). Recent authors have recognized three or four species: S. agrimonifolium, S. woodsonii, S. longiconicum (sometimes included in the next), and S. oxycarpum. We had difficulty distinguishing these species in the herbarium, and needed to resolve species boundaries for ongoing floristic studies. We studied this group in the field throughout Mexico, Guatemala, Costa Rica, and Panama, grew collections in the greenhouse, studied herbarium specimens, determined ploidy levels through flow cytometry, and generated molecular data using Random Amplified Polymorphic DNA. Molecular data distinguish S. agrimonifolium, S. longiconicum, and S. oxycarpum. Solanum woodsonii was not available for molecular analysis. All four species can be distinguished morphologically, but only by leaf character states that overlap in range, by pubescence differences that are best observed in living specimens, and by a seed spot character that is only evident on living or recently gathered specimens.

Research paper thumbnail of Diurnal Variations in Temperature Affect Cellular Elongation but Not Division

Hortscience, Jun 1, 1991

The Abstracts that follow are arranged in numerical sequence by the abstract number. For Poster S... more The Abstracts that follow are arranged in numerical sequence by the abstract number. For Poster Sessions, session numbers (in parentheses) follow the abstract numbers. Example: 003 (PS 1) represents abstract 003 in Poster Session 2; 304 (PS 14) represents abstract 304 in Poster Session 14. .