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23
10 月
Pitaya HpWRKY3 Is Associated with Fruit Sugar Accumulation by Transcriptionally Modulating Sucrose Metabolic Genes HpINV2 and HpSuSy1
| 作者： Wei, Wei ; Cheng, Mei-Nv ; Ba, Liang-Jie ; Zeng, Run-Xi ; Luo, Dong-Lan ; Qin, Yong-Hua ; Liu, Zong-Li ; Kuang, Jian-Fei ; Lu, Wang-Jin ; Chen, Jian-Ye ; Su, Xin-Guo ; Shan, Wei |
| 刊名： International journal of molecular sciences |
| 期刊所屬國別： |
| 出版年： 201904 |
| 關鍵字： Biosynthesis ; Consumers ; Enzymes ; Fructose ; Fruit ; Gene expression ; Glucose ; Metabolism ; Metabolites ; Proteins ; Sucrose ; Sugar ; Tomatoes ; Transcription ; Transcriptional activation |
| 摘要： "Sugar level is an important determinant of fruit taste and consumer preferences. However, upstream regulators that control sugar accumulation during fruit maturation are poorly understood. In the present work, we found that glucose is the main sugar in mature pitaya ( ) fruit, followed by fructose and sucrose. Expression levels of two sucrose-hydrolyzing enzyme genes and obviously increased during fruit maturation, which were correlated well with the elevated accumulation of glucose and fructose. A WRKY transcription factor HpWRKY3 was further identified as the putative binding protein of the and promoters by yeast one-hybrid and gel mobility shift assays. HpWRKY3 was localized exclusively in the nucleus and possessed trans-activation ability. exhibited the similar expression pattern with and . Finally, transient expression assays in tobacco leaves showed that HpWRKY3 activated the expressions of and . Taken together, we propose that HpWRKY3 is associated with pitaya fruit sugar accumulation by activating the transcriptions of sucrose metabolic genes. Our findings thus shed light on the transcriptional mechanism that regulates the sugar accumulation during pitaya fruit quality formation." |
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