Germination and seedling growth of ornamental species of Passiflora under artificial shade (original) (raw)
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Breeding Advances in Passiflora spp.(Passionflower) Native to Argentina
Floriculture and …
Passiflora is the largest genus in the Passifloraceae family and comprises nearly 500 species. The genus is distributed throughout the tropics and subtropics and the majority of the species are endemic of Central and South America. In Argentina, 19 species grouped in four subgenera are present. P. alata, P. amethystina, P. cincinnata, P. edulis f. edulis and P. umbilicata are the most interesting species for ornamental use due to the size and colour of their flowers. The aim of our breeding program was to obtain new forms for ornamental use. It was also focused in cold tolerance selection. Interspecific crosses have been performed, providing information about the combinatory ability of some species of the genus (P. alata, P. cincinnata, P. caerulea, P. amethystina, P. edulis f. edulis and the hybrid P. 'violacea'). P. alata and P. caerulea were crossed successfully in both directions, while the other combinations showed unilateral incompatibility. Pollen tube growth was arrested in the style in the crosses P. caerulea × P. amethystina and P. caerulea × P. alata. The knowledge of the site where incompatibility expresses allowed the design of complementary strategies in order to overcome the barriers to hybridization. The chromosome numbers found in parental species and hybrids was 2n=2x=18. Preliminary results about cold tolerance showed that P. caerulea tolerates low temperatures but P. alata and P. amethystina does not. This tolerance was reflected in their progeny.
Interspecific Hybridization in Ornamental Passion Flowers
Acta Horticulturae, 2012
The genus Passiflora (family of Passifloraceae) consists of more than 560 species of vines, lianas and small trees, widespread in tropical and subtropical regions. Passion flower exhibits unique floral features: multiple series of brightly decorated corona filaments, a prominent androgynophore and coloured petals and sepals. Equally fascinating is the wide variety and leaf shapes and colors. Due to their exotic features and the wide interspecific variability, Passiflora hybrids have a great commercial potential in the floriculture market. A collection of passion flowers including wild species, cultivars, varieties and registered hybrids was established at the Research Unit for Floriculture and Ornamental Species, in Sanremo (Italy). The plants were grown in pots in a warm greenhouse with the aim of collecting genetic resources available both for researchers and for flower growers. The present study describes the results of two years (2010-2011) cross breeding among accessions to produce new hybrids adapted to the Mediterranean climate for garden and pot plant purposes. After manual pollinations, 18 accessions that have been used as female parent produced more than 100 fruits. The fruits were collected at ripening and the seeds were sown in different conditions. The new Passiflora hybrids have been described based on morphological and phenological characters. Molecular and cytogenetic analyses were performed as well.
Production of passion fruit seedlings by grafting using native passiflora species rootstocks
Research, Society and Development, 2020
To obtain uniform passion fruit plantations, the aim of this research is to analyze the development of rootstocks and grafted seedlings, using the following treatments: non-grafted Passifora edulis and grafted with two different method: single grafting, P. edulis on P. caerulea and P. edulis on P. giberti, and double grafting, P. edulis on P. giberti and P. caerulea, on the same plant, with 3 replicates in 2 blocks. The germinative potential of seeds of the three species used was evaluated according to the storage period, viability of the grafting methods used, plant height after the juvenile period and relative growth rate. It was observed that treatments of passion fruit on P. caerulea obtained good initial development, reducing more sharply in the last data collection compared to treatments of passion fruit on P. giberti and double grafting. For non-grafted passion fruit, there was matter accumulation at the beginning of plant development, with reduction throughout collections, w...
Revista Brasileira de Fruticultura
This work aimed to evaluate the floral and physicochemical characteristics of passion fruits BRS Pérola do Cerrado cultivar (Passiflora setacea D.C.), as well as its relationship with local climatic factors. Peak flowering, time in days of floral appearance until anthesis and until fruits harvest, floral morphometry, time of flower opening and closing, occurrence of natural self-pollination, geitonogamy and floral incompatibility, physicochemical characteristics of fruits and relationship with climatic variables were evaluated. Under the conditions of this study, it was observed that the flowering peak occurred in November and the time of flower opening ranged from 7:21 pm to 8:40 pm throughout the year, probably influenced by daily solar radiation; while the time of flower closing occurred between 6:00 am and 8:00 pm. After closing, flowers showed no recurrence of floral opening. Flowers of Passiflora setacea species BRS Pérola do Cerrado cultivar are self-incompatible and do not a...
Vegetative and reproductive performance of species of the genus Passiflora
Scientia Horticulturae, 2020
As passion fruit gains market share, it becomes important to evaluate the agronomic and phenological traits of cultivated and wild genotypes for genetic improvement and understand the influence of time of cultivation on plant behavior. This study aimed to investigate agronomic and phenological parameters of Passiflora suberosa, P. alata, P. maliformis, P. quadrangularis, P. foetida, P. mucronata, P. cincinnata and hybrids BRS Rubi do Cerrado, BRS Gigante Amarelo, and BRS Pérola do Cerrado. Key traits for genetic improvement were also assessed. Two experiments were carried out for 12 months, the first starting in December 2015 and the second in May 2016. Plots were organized in a randomized block design, and analyses were performed monthly. The following vegetative characteristics were evaluated: length and diameter of orthotropic and plagiotropic branches, internode length, leaf length and width of orthotropic and plagiotropic branches, and number of plagiotropic branches. Flowering and fruiting were dichotomized as presence or absence. Ten microsatellite markers were used to estimate genetic diversity. The wild species P. suberosa differed markedly from cultivated genotypes and had the lowest values for all vegetative parameters. The hybrid BRS Gigante Amarelo differed from other plants in orthotropic branch diameter. In Experiment II, plants differed in plagiotropic branch diameter and leaf length of plagiotropic branches. Most plants had similar cumulative growth curves as well as flowering and fruiting patterns. Clustering of genotypes based on microsatellite data revealed similarities in growth parameters, flowering time, and fruiting time. Some genotypes showed similar phenological patterns and are potential candidates for developing novel hybrids, and some wild species may find application as resistant and tolerant rootstocks.
Studies on Floral Biology of Passion Fruit (Passiflora SPP.)
Pak. J. Bot, 2010
Floral biology of purple, yellow, giant and Passiflora foetida was studied at the ICAR Research Complex, Mizoram Centre, Kolasib, Mizoram, India during 2005-07. Purple, giant and P. foetida had major bloom during March-April, July-August and September-October. While major ...
Advances in passion fruit (Passiflora spp.) propagation
Revista Brasileira de Fruticultura
The propagation of many passion fruit species (Passiflora spp.) is done by seeds or sexual method, although asexual propagation, such stem cuttings, grafting or tissue culture is also possible and very useful in many cases. In this work, it was presented information on scientific and technological advances in sexual and asexual propagation of passion fruit, considering the different propagation methods and their applications. New demands for research and development activities are also related, given the wide range of passion fruit species and its potential for food, ornamental and medicinal use.
Scientia Agricola
Ornamental hybrids of passion flowers are thoroughly diffused in many countries and used in the decoration of houses and gardens. However, the cultivation of ornamental passion fruits practically unexploited in Brazil. This study aimed at evaluating the growth and blooming of F1 hybrids of Passiflora L. (P. sublanceolata J.M. MacDougal [ex P. palmeri var. sublanceolata Killip] vs. P. foetida var. foetida L.) cultivated in ceramic and concrete pots under different shading levels. The vegetative and flower evaluations were carried out weekly, in clonal cuttings 60 days after rooting. The height, leaf length and width, the number of internodes and leaves and stem diameter were evaluated using a randomized complete design in a factorial scheme which corresponded to two genotypes, two types of pot, three shading levels (25 %, 50 %, 75 %) and seven weeks of evaluation, with four replications. For the variable number of flowers, the same experimental design was adopted. However, the number...
2015
The purple passion fruit is the second economically most important species of the genus Passiflora L. as it is marketed as fresh and processed fruit in all continents. The objective of this research was to study the mechanism of natural and assisted pollination to understand gulupa reproductive system that enables the implementation of pre-breeding and conservation strategies. A total of 32 accessions from 10 Colombian departments under five pollination treatments (natural and assisted) were evaluated in Manizales, Caldas at 2340 m.a.s.l. Results show that 80% of the anthesis in purple passion fruit occurred between 6:00 and 8:00 hours, prevailing flowers with fully curved style (66.4%). The highest percentage of fruit formation was found in manual self-pollination and geitonogamy treatments (82 and 86%), and followed by cross-pollination (68%) with significant differences (Duncan, P<0.05). High precipitation during the anthesis phase (≥9 mm/day) generated a negative impact on po...