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Comparative transcriptome profiling of potassium starvation responsiveness in two contrasting watermelon genotypes

文献类型： 外文期刊

作者： Fan, Molin 1 ; Huang, Yuan 1 ; Zhong, Yaqin 1 ; Kong, Qiusheng 1 ; Xie, Junjun 1 ; Niu, Mengliang 1 ; Xu, Yong 2 ; Bie, Z 1 ;

作者机构： 1.Huazhong Agr Univ, Coll Hort & Forestry Sci, Minist Educ, Key Lab Hort Plant Biol, Wuhan 430070, Peoples R China

2.Beijing Acad Agr & Forestry Sci, Natl Engn Res Ctr Vegetables, Key Lab Biol & Genet Improvement Hort Crops North, Beijing 100097, Peoples R China

关键词： Citrullus lanatus;Gene expression;Potassium deficiency;RNA -seq;Root;Stress response

期刊名称：PLANTA （ 影响因子：4.116； 五年影响因子：4.316 ）

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收录情况： SCI

摘要： Potassium (K) is one of the essential nutrients for crops, and K~+ deficiency highly restricts crop yield and quality. Watermelon [Citrullus lanatus (Thunb.) Matsum. & Nakai] is an economically important crop that often suffers from K~+ deficiency. To elucidate the underlying tolerance mechanism of watermelon to K~+ deficiency and to improve K efficiency of watermelon and other crops in the future, two watermelon genotypes, namely, YS and 8424, that exhibit contrasting K efficiencies were studied to compare their response mechanisms to K~+ deficiency. YS was more tolerant of K~+ deficiency and displayed less inhibited root growth than 8424. Roots of YS and 8424 seedlings with or without K~+ supply were harvested at 6 and 120 h after treatment (HAT), and their transcriptomes were analyzed by Illumina RNA sequencing. Different regulation mechanisms of the root K~+-uptake genes for short- and long-term stress were observed. Genes involved in jasmonic acid and reactive oxygen species production; Ca~(2+) and receptorlike kinase signaling; lignin biosynthesis; and other stressrelated genes were repressed in YS, whereas a large number of such stress-related genes were induced in 8424 at 120 HAT. These results suggested that repressed defense and stress response can save energy for better root growth in YS, which can facilitate K~+ uptake and increase K efficiency and tolerance to K~+ deficiency. This study presents the first global root transcriptome in watermelon and provides new insights into the molecular mechanisms underlying tolerance to K~+ deficiency of K-efficient watermelon genotypes.

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