Pollen aperturePlasma membrane domainExinePollenMicrosporePattern formationPollen grains are covered by the complex extracellular structure, called exine, which in most species is deposited on the pollen surface non-uniformly. Certain surface areas receive fewer exine deposits and develop into regions whose...
C. Investigating the origins of his home country's tropical forests. D. Collecting fossil pollen grains and leaves.( A )3. What does the Paragraph 3 mainly tell us? A. How to conduct the new study. B. How to search for the rock. C. How to collect fossil grains. D. How to ...
The formation of mature and fertile pollen grains, taking place inside the anther, depends on supply of assimilates, in the form of sucrose, provided mainl... E Pressman,R Shaked,S Shen,... - 《American Journal of Plant Sciences》 被引量: 36发表: 2012年 Comparison of Ripening Characteris...
Complexes of microscopic fungi of seven pollen plant species of an apiary in the Zalesovo district (Altai krai, Russia) in two years differing in weather conditions are studied. A comparative analysis of the fungal cenoses in plant vegetative and generative organs as well as pollen grains is co...
DNA analysis for section identification of individual Pinus pollen grains from Belukha glacier, Altai Mountains, Russia Pollen taxon in sediment samples can be identified by analyzing pollen morphology. Identification of related species based on pollen morphology is difficul... F Nakazawa,J Uetake,Y ...
Induction of haploid plants from pollen grains on culture of anthers has been possible in a number of angiosperms but it is not yet understood why only a fraction of pollen responds to form haploids. Noteworthy in this connection are the recent experiments on anther culture of barley, tobacco...
Angiosperm male reproductive organs (anthers and pollen grains) have complex and interesting morphological features, but mechanisms that underlie their patterning are poorly understood. Here we report the isolation and characterization of a male sterile mutant of No Pollen 1 (NP1) in rice (Oryza sat...
2. Formation of Plant Zygote During the pollination process, pollen grains are deposited over the stigma and converted to pollen tubes. The pollen tube then migrates towards the ovary through the stigma and style. During migration two gametes are formed inside the pollen tube. When the pollen ...
1971: In vitro production of haploid plants from pollen grains ofAtropa belladonnaL Cellular and Molecular Life Sciences 27(9): 1087-1087 Levan, A. 1941: Syncyte formation in the pollen mother-cells of haploid Phleum pratense Hereditas 27(3/4): 243-252 Fischer, H.E. 1964: Observations on...
The present paper deals with the fossil spores and pollen grains collected from the middle Triassic Liaocheng Formation in Liaocheng region, Shandong. There are totally 42 genera and over 60 species, including 3 new species discovered therein. In general aspects the palynological assemblage is characte...