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24 gru 2021 · The stigma is a swollen, knob-like structure. It can be either hairy or sticky, or sometimes both to trap pollen grains. In wind-pollinated flowers, like grasses, it may be feathery and branched or elongated. However, for some other flowers, it may be compact and has a sticky surface.
11 cze 2004 · Defines stigmas as uniquely water-permeant sites on the plant; proteins and lipids are involved in adhesion, hydration, and germination; dry stigmas are pollen compatibility sites, with selective support of pollen hydration and germination, whereas wet stigmas often are covered in exudates from apoptotic cells and block inappropriate ...
Stigma can play an active role in pollen discrimination and some self-incompatibility reactions, that reject pollen from the same or genetically similar plants, involve interaction between the stigma and the surface of the pollen grain.
5 paź 2024 · During sexual reproduction in flowering plants, tip-growing pollen tubes travel from the stigma inside the maternal tissues of the pistil towards ovules. In maize (Zea mays L.), the stigma is highly elongated, forming thread-like strands known as silks.
28 maj 2018 · The stigma has a tightly regulated functional lifespan and is therefore a key determinant for floral receptivity. New evidence reveals how two transcription factors play a pivotal role in...
Various plant tissues from sunflower (whole seedlings, hypocotyl segments, stigma from capitulum, protoplasts and isolated oil bodies) have been tested for detection of NO using MNIP-Cu. In this context, the probe has been observed to be relatively nontoxic at concentrations up to 50 µM.
25 sty 2023 · A signalling mechanism ensuring intraspecies and interspecies reproductive barriers in flowering plants is uncovered.
