AI Article Synopsis
- Flowering plants use specific interactions between pollen and pistils to ensure fertilization occurs within the same species and to prevent cross-species fertilization.
- In Arabidopsis, several receptor kinases (RKs) are known to control the later stages of pollen tube growth, but this study investigates their role in the earlier stages.
- The research found that a group of LRR-MAL RKs in the stigma helps support the growth of Arabidopsis pollen tubes and creates a barrier against pollen from other species (like Capsella rubella), highlighting their importance in early sexual reproduction.
Article Abstract
Flowering plants contain tightly controlled pollen-pistil interactions required for promoting intraspecific fertilization and preventing interspecific hybridizations. In Arabidopsis (Arabidopsis thaliana), several receptor kinases (RKs) are known to regulate the later stages of intraspecific pollen tube growth and ovular reception in the pistil, but less is known about RK regulation of the earlier stages. The Arabidopsis RECEPTOR-LIKE KINASE IN FLOWERS1 (RKF1)/RKF1-LIKE (RKFL) 1-3 cluster of 4 leucine-rich repeat malectin (LRR-MAL) RKs was previously found to function in the stigma to promote intraspecific pollen hydration. In this study, we tested additional combinations of up to 7 Arabidopsis LRR-MAL RK knockout mutants, including RKF1, RKFL1-3, LysM RLK1-INTERACTING KINASE1, REMORIN-INTERACTING RECEPTOR1, and NEMATODE-INDUCED LRR-RLK2. These LRR-MAL RKs were discovered to function in the female stigma to support intraspecific Arabidopsis pollen tube growth and to establish a prezygotic interspecific barrier against Capsella rubella pollen. Thus, this study uncovered additional biological functions for this poorly understood group of RKs in regulating the early stages of Arabidopsis sexual reproduction.
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| http://dx.doi.org/10.1093/plphys/kiae038 | DOI Listing |
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