Department of Biomolecular Engineering, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan.
Department of Chemical and Biological Sciences, Faculty of Science, Japan Women's University, Bunkyo-ku, Tokyo 112-8681, Japan.
Sci Adv. 2023 Jun 2;9(22):eadg5495. doi: 10.1126/sciadv.adg5495.
Salinity stress can greatly reduce seed production because plants are especially sensitive to salt during their reproductive stage. Here, we show that the sodium ion transporter AtHKT1;1 is specifically expressed around the phloem and xylem of the stamen in to prevent a marked decrease in seed production caused by salt stress. The stamens of AtHKT1;1 mutant under salt stress overaccumulate Na, limiting their elongation and resulting in male sterility. Specifically restricting expression to the phloem leads to a 1.5-fold increase in the seed yield upon sodium ion stress. Expanding phloem expression of AtHKT1;1 throughout the entire plant is a promising strategy for increasing plant productivity under salinity stress.
盐胁迫会极大地降低种子产量，因为植物在生殖阶段对盐特别敏感。在这里，我们表明，钠离子转运蛋白 AtHKT1;1 在 的雄蕊的韧皮部和木质部周围特异性表达，以防止盐胁迫导致种子产量明显下降。在盐胁迫下，AtHKT1;1 突变体的雄蕊中钠离子过度积累，限制了其伸长，导致雄性不育。具体来说，将 AtHKT1;1 的表达特异性限制在韧皮部会导致在钠离子胁迫下种子产量增加 1.5 倍。在整个植物中扩大 AtHKT1;1 的韧皮部表达是在盐胁迫下提高植物生产力的一种很有前途的策略。
