Pollen ovule ratio
WebPOLLEN-OVULE RATIO, POLLEN SIZE, AND THE RATIO OF STIGMATIC AREA TO THE POLLEN-BEARING AREA OF THE POLLINATOR: AN HYPOTHESIS ROBERT WILLIAM CRUDEN Department of Botany and Program in Evolutionary Ecology and Behavior, University of Iowa, Iowa City, Iowa 52242 AND SHARON MILLER-WARD Iowa … WebAug 11, 2004 · Pollen Histochemistry and Pollen : Ovule Ratios in Zingiberaceae Annals of Botany Oxford Academic Abstract. • Background and Aims Pollen grains of 37 species from 11 genera in the family Zingiberaceae were examined to assess qualitatively starch or lipid con Skip to Main Content Advertisement Journals Books Search Menu Menu
Pollen ovule ratio
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WebFew studies have directly examined the relationship between pollen-ovule ratio and pollen transfer efficiency. For active pollination in the pollination brood mutualisms of yuccas and yucca moths, figs and fig wasps, senita and senita moths, and leafflowers and leafflower moths, pollinators purposefully collect pollen and place it directly on ... WebPollen-ovule ratios (P/O) were measured for 79 species of Caryophylloideae (Agrostemma, Dianthus, Saponaria, Silene, and Vaccaria). We analyzed if these fe Pollen grain …
WebThe correlation between pollen/ovule (P/O) ratio and breeding system has generally been accounted for either on the basis that P/O reflects pollination efficiency, or in terms of the … WebDec 30, 2015 · Reproductive biology (pollen-ovule ratio, pollen viability, germination in vivo pollination and stigma receptivity in vivo) and karyotype characterization by classical and molecular techniques were performed in Passiflora sublanceolata. The pollen-ovule ratio was 83.9, suggesting that this species is facultative autogamous. Pollen viability …
WebMoreover, the quantity of pollen per flower was estimated at 22,560 for control plants grown at the 24/18°C regime. These plants produced 5.9 ovules per ovary, establishing a pollen-ovule... WebMar 3, 2024 · pollination, transfer of pollen grains from the stamens, the flower parts that produce them, to the ovule-bearing organs or to the ovules (seed precursors) themselves. In plants such as conifers and cycads, in which the ovules are exposed, the pollen is simply caught in a drop of fluid secreted by the ovule.
WebThe pollen:ovule ratio (P/O) has traditionally been used as a rough estimator of plant breeding systems. It has been shown that plant breeding systems are associated with …
WebJun 29, 2024 · We did not investigate the endomembrane trafficking defects related to ovule or embryo sac development, but the fact that AP-1 has been previously implicated in ovule development and synergid function during pollen tube reception (Wang et al., 2016, 2024) is consistent with a similar requirement of β subunits as part of the AP-1 complex for ... hsn code for biometric machineWebDec 30, 2014 · The pollen/ovule (P/O) ratio has been used as predictor of the reproductive system of angiosperms (lowest P/O values correspond to obligate autogamous species … hobby word hisotryWebMar 14, 2014 · Interspecific variation in pollen–ovule ratio is negatively correlated with pollen transfer efficiency in a natural community ... The pollination efficiency hypothesis has long been proposed as an explanation for interspecific variation in pollen–ovule (P:O) ratios. However, no empirical study on P:O ratios has directly and quantitatively ... hsn code for bmsWebApr 12, 2024 · The genus Limonium Mill. (sea lavenders) includes species with sexual and apomixis reproductive strategies, although the genes involved in these processes are unknown. To explore the mechanisms beyond these reproduction modes, transcriptome profiling of sexual, male sterile, and facultative apomictic species was carried out using … hobby woodworking projectsWebMay 5, 2011 · The evolution of pollen–ovule ratios is likely to depend on selective factors affecting mating system, pollen presentation and dispensing, patterns of pollen receipt, … hsn code for body shaverWebDec 30, 2024 · We counted the male and female flowers on each plant and multiplied the pollen-ovule ratio per flower by the male-to-female flower ratio to determine the plant … hsn code for boiler sparesWebThe pollen/ovule (P/O) ratio has been used as predictor of the repro-ductive system of angiosperms (lowest P/O values correspond to obli-gate autogamous species while the highest correlate with obligate xenogamous species) but … hobby word origin