Strigolactones restore vegetative and reproductive developments in Huanglongbing (HLB) affected, greenhouse-grown citrus trees by modulating carbohydrate distribution

文献类型： 外文期刊

第一作者： Zheng, Yongqiang

作者： Zheng, Yongqiang;Kumar, Neveen;Zheng, Yongqiang;Gonzalez, Pedro;Etxeberria, Ed.

作者机构：

关键词： Citrus sinensis; HLB; Strigolactones; Photoassimilates partition

期刊名称：SCIENTIA HORTICULTURAE （ 影响因子：3.463； 五年影响因子：3.672 ）

ISSN： 0304-4238

年卷期： 2018 年 237 卷

页码：

收录情况： SCI

摘要： Two-year-old greenhouse-grown Huanglongbing (HLB)-affected and healthy 'Hamlin' sweet orange (Citrus sinensis L. Osbeck) trees were spray treated with 10 mu M strigolactone (SL) during the floral induction period (November 2016 and January 2017), and the flowering and fruit-setting period (April and June of 2017). Trees were grouped in four treatments: SL-treated HLB-affected trees; untreated HLB-affected trees; SL-treated healthy trees, and healthy control trees. Strigolactone application on HLB-affected trees during floral induction accelerated and augmented reproductive growth by inducing a 2.3-fold increase in flower bearing branches and an average of 2.6-fold increase in flowers per tree within two months from application. On the contrary, the same trees produced 31% less vegetative branches, 55% less flower bearing branches and 85% fewer flowers than HLB trees during the spring flush (April 2017). For the entire season, the number of fruit was higher in HLB + SL trees compared to untreated HLB-affected trees. Strigolactone application on healthy trees increased sucrose and starch content in mature leaves by 26% and 166%, respectively, with a 47% increase in the number of flowers compared to untreated trees. Strigolactone application during the flowering and fruit-setting period induced additional summer flush. The results of iodine staining and analytical observations demonstrated a decline in starch content in leaves and an increase in roots of SL-treated HLB-affected trees. We conclude that strigolactone ameliorates the effect of HLB by balancing vegetative and reproductive developmental response in HLB-affected citrus trees through the partitioning of stored carbohydrate.

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