POLLEN APERTURE POLYMORPHISM AND GAMETOPHYTE PERFORMANCE INVIOLA DIVERSIFOLIA
نویسندگان
چکیده
منابع مشابه
Evolution of pollen morphology.
Over evolutionary time, the morphology of angiosperm pollen has evolved toward an increasing number of apertures, among other things. From a neo-Darwinian point of view, this means that (i) some polymorphism for aperture number must exist and (ii) there must be some fitness increase associated with increasing the aperture number. Pollen types with different aperture numbers often occur in the s...
متن کاملPollen tube guidance by the female gametophyte.
In flowering plants, pollen grains germinate on the pistil and send pollen tubes down the transmitting tract toward ovules. Previous genetic studies suggested that the ovule is responsible for long-range pollen tube guidance during the last phase of a pollen tube's journey to the female gametes. It was not possible, however, to unambiguously identify the signaling cells within an ovule: the hap...
متن کاملFemale gametophyte-controlled pollen tube guidance.
During the evolution of flowering plants, their sperm cells have lost mobility and are transported from the stigma to the female gametophyte via the pollen tube to achieve double fertilization. Pollen tube growth and guidance is largely governed by the maternal sporophytic tissues of the stigma, style and ovule. However, the last phase of the pollen tube path is under female gametophyte control...
متن کاملFemale Gametophyte Development and Pollen Tube Guidance in Arabidopsis thaliana
1 Department of Botany, Graduate School of Science, Kyoto University, Kitashirakawa-oiwake, Sakyo, Kyoto, 606-8502 Japan 2 Institute of Plant Biology, University of Zurich, Zollikerstrasse 107, Zurich, CH-8008, Switzerland 3 Temasek Life Sciences Laboratory, 1 Research Link, National University of Singapore, Singapore 117604 4 Department of Biological Mechanisms and Functions, Graduate School o...
متن کاملThe Arabidopsis GPR1 Gene Negatively Affects Pollen Germination, Pollen Tube Growth, and Gametophyte Senescence
Genes essential for gametophyte development and fertilization have been identified and studied in detail; however, genes that fine-tune these processes are largely unknown. Here, we characterized an unknown Arabidopsis gene, GTP-BINDING PROTEIN RELATED1 (GPR1). GPR1 is specifically expressed in ovule, pollen, and pollen tube. Enhanced green fluorescent protein-tagged GPR1 localizes to both nucl...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Evolution
سال: 1993
ISSN: 0014-3820
DOI: 10.1111/j.1558-5646.1993.tb02137.x