Fruit presence induces polar auxin transport in citrus and olive stem and represses IAA release from the bud

第一作者：Dor Haim

第一单位：以色列农业研究组织植物科学研究所

通讯作者：Avi Sadka

 Abstract 

隔年结实：In many fruit trees, heavy fruit load in one year reduces flowering in the following year, creating a biennial fluctuation in yield termed alternate bearing (AB).

结实与开花诱导：In subtropical trees, where flowering induction is mostly governed by the accumulation of chilling hours, fruit load is thought to generate a signal (AB signal) that blocks the perception of the cold induction.

去果实：Fruit removal during a heavy-fruit-load year (On-Crop) is effective at inducing flowering only if performed one to a few months prior to onset of the flowering induction period.

前期研究基础：We previously showed that following fruit removal, content of the auxin indoleacetic acid (IAA) in citrus buds is reduced, suggesting that the hormone plays a role in the AB signal.

主要研究：Here, we demonstrate that fruit presence generates relatively strong polar auxin transport (PAT) in citrus and olive stems.

结果1-去果后PAT：Upon fruit removal, PAT is reduced and allows auxin release from the bud.

结果2-去果后IAA含量：Furthermore, using immunolocalization, hormone and gene expression analyses, we show that in citrus, IAA level in the bud and, specifically, in the apical meristem is reduced upon fruit removal.

结论：Overall, our data provide support for the notion that fruit presence generates an auxin signal in the bud which may affect flowering induction.

 通讯作者 

doi: https://doi.org/10.1093/jxb/eraa590

Journal: Journal of Experimental Botany

Published date: Dec 21, 2020

p.s. 相关研究：

New Phytologist：柑桔树大小年结果参与开花的表观调控