Pollen development of Rheum nobile Hook.f. & Thomson (Polygonaceae), with reference to its sterility induced by bract removal
نویسندگان
چکیده
منابع مشابه
Genome-Scale Transcriptome Analysis of the Alpine “Glasshouse” Plant Rheum nobile (Polygonaceae) with Special Translucent Bracts
BACKGROUND Rheum nobile is an alpine plant with translucent bracts concealing the inflorescence which produce a "glasshouse" effect promoting the development of fertile pollen grains in such conditions. The current understanding of the adaptation of such bracts to alpine environments mainly focuses on the phenotypic and physiological changes while the genetic basis is very limited. By sequencin...
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هدف از این تحقیق بررسی برخی عوامل ادراکی واحساسی یعنی استفاده از شیوه های یادگیری زبان ، انگیزه ها ونگرش نسبت به زبان انگلیسی در رابطه با زمینه زبانی زبان آموزان می باشد. هدف بررسی این نکته بود که آیا اختلافی چشمگیر میان زبان آموزان دو زبانه و تک زبانه در میزان استفاده از شیوه های یادگیری زبان ، انگیزه ها نگرش و سطح مهارت زبانی وجود دارد. همچنین سعی شد تا بهترین و موثرترین عوامل پیش بینی کننده ...
15 صفحه اولMorphological Variation in Leaf Dissection of Rheum palmatum Complex (Polygonaceae)
AIMS Rheum palmatum complex comprises all taxa within section Palmata in the genus Rheum, including R. officinale, R. palmatum, R. tanguticum, R. tanguticum var. liupanshanense and R. laciniatum. The identification of the taxa in section Palmata is based primarily on the degree of leaf blade dissection and the shape of the lobes; however, difficulties in species identification may arise from th...
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BACKGROUND During adaptive radiation events, characters can arise multiple times due to parallel evolution, but transfer of traits through hybridization provides an alternative explanation for the same character appearing in apparently non-sister lineages. The signature of hybridization can be detected in incongruence between phylogenies derived from different markers, or from the presence of t...
متن کاملCytological Investigation of Pollen Development in Sorghum Line with Male Sterility Induced by Sodium Ascorbate in Tissue Culture
Investigation of male sterility mutations is an effective approach for identification of genes involved in anther and pollen development. The comparison of “cytological phenotypes” of newly induced mutants with phenotypes determined by already known genes favors elucidation of genetic control of diverse microsporoand gametogenesis stages. In this paper, we describe pollen development in the gra...
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ژورنال
عنوان ژورنال: Botanical Journal of the Linnean Society
سال: 1996
ISSN: 0024-4074
DOI: 10.1111/j.1095-8339.1996.tb02076.x