The Role of Annexin Genes in Strawberry Fruit Development
March 30, 2016| |
Plant annexins are multi-functional membrane- and Ca2+-binding proteins that are involved in various developmental progresses and stress responses. Jingxin Chen along with researchers of Zheijang University studied three annexins, FaAnn5a, FaAnn5b and FaAnn8, from strawberry to learn of their roles in fruit development.
During fruit development, the transcript levels of FaAnn5a and FaAnn5b increased while FaAnn5b decreased. The expression patterns of annexins suggested their potential roles in strawberry fruit development and ripening. Expressions of annexin genes were also highly correlated with hormone levels.
Exogenous abscisic acid (ABA) enhanced the expressions of FaAnn5a and FaAnn8 while exogenous auxin (IAA) retarded their expressions. However, both ABA and IAA promoted the expression of FaAnn5b, indicating the independent regulation of each annexin. The responses of annexin genes to exogenous ABA and IAA inhibitors confirmed the involvement of annexins in plant hormone signaling.
Calcium inhibited the expressions of FaAnn5a and FaAnn5b but enhanced that of FaAnn8. Effects of calcium on annexin expression confirmed that it mediates hormone signal transduction pathways. Therefore, the three annexins might be involved in plant hormones' regulation in the development and ripening of strawberry fruit through calcium signaling.
To learn more on the study, read the full article on Plant Cell Reports.
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