期刊
JOURNAL OF EXPERIMENTAL BOTANY
卷 72, 期 7, 页码 2450-2462出版社
OXFORD UNIV PRESS
DOI: 10.1093/jxb/eraa590
关键词
Alternate bearing; auxin; citrus; defruiting; fruit load; fruit tree; indoleacetic acid; olive; polar auxin transport
资金
- Research Fund of the Chief Scientist of the Ministry of Agriculture and Rural Development, Israel [20-10-0058]
In fruit trees, the alternate bearing (AB) phenomenon is influenced by heavy fruit load in one year, which can reduce flowering in the following year. Fruit removal before the flowering induction period can effectively induce flowering by reducing the auxin indoleacetic acid (IAA) content in buds. Fruit presence generates strong polar auxin transport in citrus and olive stems, which decreases upon fruit removal, releasing auxin from the bud and reducing IAA levels in apical meristem, ultimately affecting flowering induction.
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). 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 cold induction. Fruit removal during a heavy-fruit-load year is effective at inducing flowering only if performed one to a few months before the onset of the flowering induction period. We previously showed that following fruit removal, the content of the auxin indoleacetic acid (IAA) in citrus buds is reduced, suggesting that the hormone plays a role in the AB signal. Here, we demonstrate that fruit presence generates relatively strong polar auxin transport in citrus and olive stems. Upon fruit removal, polar auxin transport is reduced and allows auxin release from the bud. 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. Overall, our data provide support for the notion that fruit presence generates an auxin signal in the bud, which may affect flowering induction.
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