An organ-specific role for ethylene in rose petal expansion during dehydration and rehydration

文献类型： 外文期刊

第一作者： Liu, Daofeng

作者： Liu, Daofeng;Liu, Xiaojing;Meng, Yonglu;Sun, Cuihui;Tang, Hongshu;Jiang, Yudong;Khan, Muhammad Ali;Ma, Nan;Gao, Junping;Liu, Daofeng;Liu, Xiaojing;Xue, Jingqi

作者机构：

关键词： cut roses;dehydration;ethylene biosynthesis;ethylene perception;petal expansion;rehydration

期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：6.992； 五年影响因子：7.86 ）

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收录情况： SCI

摘要： Dehydration is a major factor resulting in huge loss from cut flowers during transportation. In the present study, dehydration inhibited petal cell expansion and resulted in irregular flowers in cut roses, mimicking ethylene-treated flowers. Among thefive floral organs, dehydration substantially elevated ethylene production in the sepals, whilst rehydration caused rapid and elevated ethylene levels in the gynoecia and sepals. Among the five ethylene biosyn-thetic enzyme genes [RhACS1-5), expressionof RhACSI and RhACS2 was induced by dehydration and rehydration in the two floral organs. Silencing both RhACSI and RhACS2 significantly suppressed dehydration- and rehydration-induced ethylene in the sepals and gynoecia. This weakened the inhibitory effect of dehydration on petal cell expansion. B-glucuronidase activity driven by both the RhACSI and RhACS2 promoters was dramatically induced in the sepals, pistil, and stamens, but not in the petals of transgenic Arabidopsis. This further supports the organ-specific induction of these two genes. Among the five rose ethylene receptor genes (RhETRI-5), expression of RhETR3 was predominantly induced by dehydration and rehydration in the petals. RhETR3 silencing clearly aggravated the inhibitory effect of dehydration on petal cell expansion. However, no significant difference in the effect between RhETR3-silenced flowers and RhETRI-genes-silenced flowers was observed. Furthermore, RhETR-genes silencing extensively altered the expression of 21 cell expansion-related downstream genes in response to ethylene. These results suggest that induction of ethylene biosynthesis by dehydration proceeds in an organ-specific manner, indicating that ethylene can function as a mediator in dehydration-caused inhibition ofcell expansion in rose petals.

分类号： Q94

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