کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2179574 1095062 2012 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Ultrastructural study of pollen and anther development in Luehea divaricata (Malvaceae, Grewioideae) and its systematic implications: Role of tapetal transfer cells, orbicules and male germ unit
کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
Ultrastructural study of pollen and anther development in Luehea divaricata (Malvaceae, Grewioideae) and its systematic implications: Role of tapetal transfer cells, orbicules and male germ unit
چکیده انگلیسی

Developmental processes of microsporogenesis and microgametogenesis in Luehea divaricata (Malvaceae, Grewioideae) were analyzed with transmission electron microscopy. The species studied has perfect flowers. The young anthers are bithecal and tetrasporangiate; microspore mother cells undergo simultaneous meiosis, forming tetrads with a tetrahedral arrangement. The development of the anther wall conforms to the basic type and the tapetum is secretory. The results highlight the presence of multinucleate tapetal cells, which acquire ultrastructural features characteristic of transfer cells at the young pollen grain stage, and which are associated with the presence of orbicules. Tapetal transfer cells have not been previously investigated in detail for other species of angiosperms; their function during pollen development is discussed. The present work is the first contribution to the knowledge of ultrastructural pollen development in the genus Luehea, as well as in the subfamily Grewioideae.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Flora - Morphology, Distribution, Functional Ecology of Plants - Volume 207, Issue 12, December 2012, Pages 888–894
نویسندگان
, , ,