-
In angiosperms, the reproduction process starts once the pollen grain lands on the stigma. Before pollen tubes grow into stigma for fertilization, complicated communications between pollen and stigma papillary cells occur. The stigma papillae have to distinguish compatible pollen from foreign pollen, incompatible pollen and fungal spores. In general, flowering plants could be classified into dry stigma type and wet stigma type. In dry stigma plants such as Brassicaceae, stigma provides water for pollen hydration and germination after stringent pollen-stigma interactions. Encompassing diverged kinds of pollens including self-compatible (SC), self-incompatible (SI), unilaterally compatible (UC) and unilaterally incompatible (UI), the Brassicaceae represents an ideal model family for extensive study of the molecular mechanism of pollen-stigma interactions.
Concluding remarks and future perspectives -
So far, studies have discovered the interplay between the two crucial receptor kinases SRK and FER in intraspecific and interspecific pollen-stigma recognition. However, many interesting questions await further study. How does compatible pollination induce the generation of the stigmatic NO? How is the NO level alteration regulated? The mechanism of the redox regulation of the stigma papillae would deepen our understanding of the pollen-stigma interaction processes. Besides, further exploration of the signal from UI pollen that activates the SRK and FER signaling should provide valuable clues for the UI responses. In addition, the Brassicaceae family include many important vegetable and oil crops, manipulation of the ROS, NO, and/or SRK‒FER signaling components could be useful approaches for distant hybridization.
(1) References(10) - About this article
Cite this articleCheng L, Li C. 2023. Stigma receptors function as barriers between intraspecies and interspecies in Brassicaceae. Seed Biology 2:3 doi: 10.48130/SeedBio-2023-0003 -
Stigma receptors function as barriers between intraspecies and interspecies in Brassicaceae
- Received: 30 January 2023
- Accepted: 31 January 2023
- Published online: 09 February 2023
-
Key words:
- Receptors /
- Intraspecies /
- Interspecies /
- Stigma