Differential transcriptomic changes in low-potassium sensitive and low potassium tolerant tea plant (Camellia sinensis) genotypes under potassium deprivation

文献类型： 外文期刊

第一作者： Li, Yeyun

作者： Li, Yeyun;Wang, Wenzhi;Wang, Wenzhi;Wei, Kang;Ruan, Li;Wang, Liyuan;Cheng, Hao;Zhang, Fen;Wu, Liyun;Bai, Peixian;Ruan, Li

作者机构：

关键词： Camellia sinensis; K starvation; Root morphology; Differentially expressed gene

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： 2019 年 256 卷

页码：

收录情况： SCI

摘要： Potassium (K) deficiency is a common abiotic stress that can inhibit plant growth and thus reduce crop productivity. K shortages in tea farms are very severe in current tea production systems. Therefore, developing low-K tolerant tea plants is an effective approach to mitigating K deficiencies in agricultural production systems. Up to now, the mechanisms underlying the transcriptional changes of tea plants under K+ deprivation have not been studied. In this study, to elucidate the underlying mechanism of tea plant genotype tolerance to K deprivation, we investigated K deprivation-induced changes in root morphology and global transcription in two tea plant genotypes, "1511" and "1601", which are tolerant and sensitive to low-K conditions, respectively. The results showed that the root systems were more developed in "1511" than "1601". The K starvation treatment increased the proportion of roots with a 0.5-2 mm diameter in "1511" and the proportion of those with a 0-0.5 nun diameter in "1601". There were 487 and 294 up-regulated genes in "1511" and "1601" (> 2-fold change), respectively. The expression levels of the most differentially expressed genes in "1511" were higher than those in "1601". Under K+ starvation, we detected differentially expressed genes were only up-regulated in "1511" associated with ethylene-related, ammonium transporter, nitrate transporter, catalase-related and phosphatidylinositol-related pathways. These up-regulated genes might play crucial roles in root architecture and K+ uptake and utilization, which would help enhance the low-K tolerance of "1511". Our study provides new insights into the molecular mechanisms underlying tolerance of K+ starvation and builds a foundation for selecting low-K tolerance tea plant genotypes.

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