Research shows heat-stress improves pollen germination in Arabidopsis, suggesting Rab5 GTPases enhance resilience.
Summary statement In Arabidopsis, canonical Rab5 GTPases ARA7 / RHA1 are upregulated by heat, and their loss ( crab5 mutant) impairs pollen germination under heat, while ARA7 overexpression enhances thermotolerance and competitive fertilisation.
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Yu et al. (2026) studied this question.
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