The Seed Atlas of Pakistan-X. Cucurbitaceae (original) (raw)
Related papers
Acta Botanica Brasilica, 2015
To evaluate their diagnostic value in systematic studies, seed coat morphology for 16 taxa from 11 genera of Cucurbitaceae were examined using stereomicroscopy and scanning electron microscopy. The taxa included representatives of the tribes Benincaseae, Bryonieae, Coniandreae, and Luffeae in order to evaluate their diagnostic value in systematic studies. Macro-and micromorphological characters of their seeds are presented, including shape, color, size, surface, epidermal cell shape, anticlinal boundaries, and periclinal cell wall. The taxonomic and phylogenetic implications of seed coat micromorphology were compared with those of the available gross morphological and molecular data. Seed character analysis offered useful data for evaluating the taxonomy of Cucurbitaceae on both intrageneric and tribal levels. Monophyly of the tribes Bryonieae, Coniandreae, and Luffeae was supported. Moreover, these analyses supported previous biochemical and phylogenetic data, indicating that distinct lineages are present within the tribe Benincaseae, that this tribe is not monophyletic, and that the subtribe Benincasinae is highly polyphyletic. A key is provided for identifying the investigated taxa based on seed characters.
Ambient Science, 2020
Seedling characters are important and promising from the taxonomic as well as evolutionary point of view. The seedling morphology of f ive medicinal plants of Cucurbitaceae was studied from different parts of Tripura, Northeast India. Seedling morphology of f ive species of Cucurbitaceae has been investigated on the basis of their germination pattern, the position of cotyledon, hypocotyl, epicotyl, and para-cotyledon and eophylls development. An artif icial key has been constructed for easier identif ication of plants in their juvenile stage. Phenogram has been prepared to investigate the correlation between the investigated taxa. Cluster analysis summarized the relationship among the investigated taxa into a phenogram.
Comparative studies on the morphology and anatomy of the three species of Cucurbita L. (C. moschata, C. maxima and C. pepo) in Nigeria were carried out. The morphological features of significance include variations in the number of tendrils, fruit size, shape, nature of fruit stalk, leaf shape and flower colour. Seed-coat anatomy revealed four distinct zones, which varied in thickness and tissue layers. Similarities were observed in the distribution, differentiation and number of layers of cells and tissues in the leaf, petiole and stem sections. There were, however, variations in number of bicollateral vascular bundles in their petiole. While the number is 10 in C. moschata, 14 in C. pepo, it is 16 in C. maxima. Parietal placentation and 15 anther-lobes are reported for these species for the first time. The usefulness of these parameters in the taxonomic delimitation of these species is discussed.
Comparative Vegetative Anatomy of Some Species of the Family Cucurbitaceae Juss in Nigeria
Research Journal of Botany, 2013
Detailed morphological study of the vegetative and floral parts of the melon species belonging to the family, Cucurbitaceae, found in Nigeria was conducted in search of intergeneric and intraspecific characters that may be of taxono mic value in the species identification. Important and significant diagnostic characters were observed. Morphological characters that may be of taxonomic value are variat ions in the fru it colour, seed color, and seed sizes. Branched tendrils were found in the C. lanatus species, and C. moschata (Duch. Ex Lam.) Duch. Ex Poiret, while Cucumis melo L. (sweet melon), and Cucumeropsis mannii Naud. (syn. C. edulis (Hooker f.) cogn.) (White-seeded melon), have simple tendrils. The morphological differences existing between watermelon and brown-seeded melon in particular and among the melons as a whole are presented.
Anatomical Diversity among Certain Genera of Family Cucurbitaceae
The anatomical characters of the Cucrbitaceae having long attracted the attention of botanists. In order to understand the evolution of anatomical diversity, anatomical features of five genera in the family Cucurbitaceae, (Colocynthis, Cucumis, Cucurbita, Citrullus, and Luffa) were investigated. Similarities in the distribution, tissue differentiation and number of layers of cells and tissues in the root, stem and leaf transverse sections were similar in all genera. However, there were variations in the vascular bundles in the roots where they were bicollateral in Cucumis sativus and Luffa aegyptiaca, while it consisted of four radial arms of primary xylem alternating with four arms of primary phloem in the other species. The Trichomes were multicellular, glandular and non-glandular types with a preponderance of non-glandular types with various shapes. The variation in number of tiers within these trichomes was taxonomically significance.
Genetic Resources and Crop Evolution, 2018
Field observations and herbarium studies distinguish C. muriculatus from C. hystrix for many distinct morphological characters. The present record of C. muriculatus in India is based on the collections from Mizoram, previously described as Cucumis hystrix var. mizoramensis Sutar et S.R. Yadav, and is synonymized under it here. Full description, taxonomic key and comparative morphology of C. muriculatus and C. hystrix are given along with notes on their ecology, adaptability under cultivation and economic potential. Collections of these two rare crop wild relatives of cucumber from Indian Gene Centre assume great significance for cucumber improvement.
Embryology of Cucurbitaceae and circumscription of Cucurbitales: a review
2015
The literature on embryology of Cucurbitaceae may appear to be exhaustive but only c. 3 per cent of all the recognized genera have been investigated so far. In these Cucurbitaceae, the bi-or tetrasporangiate anthers are usually with a layer of epidermis, fibrous endothecium, 2-3 ephemeral middle layers and Secretory tapetum. Cytokinesis is simultaneous and microspores are arranged in tetrahedral, isobilateral and decussate manner. Pollen grains are shed at 2 or 3-celled stage. The ovules are anatropous, bitegmic and crassinucellate. The female archesporium is one to multi-celled and the embryo sac development is of Polygonum type. Fertilization is porogamous. Endosperm development is of Nuclear type. The chalazal endosperm haustorium varies in size from rudimentary to a long coenocytic organ and may remain either coenocytic forever or becomes partly or completely cellular in some cucurbits. The embryogeny corresponds to Onagrad, Asterad or Solanad type. Seed coat is formed by outer integument alone and comprises epidermis, hypodermis, main sclerotic layer, aerenchyma and chlorenchyma or parenchyma. Mature seed is exalbuminous. The embryo is spatulate and occupies major part of the seed. Pericarp consists of epicarp, hypoderm, mesocarp and endocarp. A comparative study of the families included in the order Cucurbitales indicates that the families Cucurbitaceae, Begoniaceae, Tetramelaceae, Datiscaceae, Coriariaceae, Corynocarpaceae and Anisophyllaceae show similarities in broad embryological features. Embryological data support the interfamilial relationships as inferred from the DNA sequence data.
Morphology and distribution of species of the family Cucurbitaceae in Akwa Ibom State, Nigeria
Phytotaxa
A study of the family Cucurbitaceae in Akwa Ibom State, Nigeria, was carried out in 15 Local Government Areas in different ecological zones across the State, where collections were made between May 2017 and June 2018. A total of eleven species in nine genera were collected: Citrullus lanatus, Citrullus mucosospermus, Cucumis sativus, Cucurbita maxima, Lagenaria siceraria, Lagenaria sphaerica, Luffa aegyptiaca, Momordica charantia, Siraitia africana, Telfairia occidentalis, and Trichosanthes cucumerina. Variation in morphology were seen in the investigated species in the stem shape that were cylindrical or angular, the compound or simple types of leaves, the indumentum of the leaf, the acute or acuminate leaf apices, the yellow or white petals, the cylindrical, spherical or irregular fruit shape, the lanceolate or irregular seed shape, and the pubescent or smooth seed. Cultivated cucurbits collected were 65% of the species investigated, while 35% occurred in the wild. A survey of the...
2015
Inter Simple Sequence Repeat (ISSR) markers were employed to study the genetic diversity among 30 indigenous species of Iranian cucurbit from five different genera of Cucurbitaceae. Eleven out of seventeen studied primers amplified a total of 283 bands, out of which 263 (92.93%) were polymorphic. The mean Polymorphism Information Content (PIC) was estimated at 0.327. Among the primers, ISSR15 exhibited the highest polymorphic bands and PIC value and was recognized as the most appropriate and discriminating primer to investigate genetic diversity. The results of clustering analysis showed that the least distance was observed between two species of Cucumis L. genus from Mashhad and Sabzevar with a genetic similarity value of 68.34%, while the highest genetic distance was observed between two species of Cucumis L. and Cucurbita L. genera from Dastgerd and Hamadan with a genetic similarity value of 20.71%. Although Cucurbita maxima and Cucurbita maschata were genetically similar, they w...