数字农科院2.0

Abrassica Napusreductase Gene Dissected By Associative Transcriptomics Enhances Plant Adaption To Freezing Stress

文献类型： 外文期刊

作者： Huang, Y; Hussain, MA; Luo, D; Xu, HZ; Zeng, C; Havlickova, L; Bancroft, I; Tian, ZT; Zhang, XK; Cheng, Y; Zou, XL; Lu, GY; Lv, Y

作者机构：

关键词： Rapeseed; Associative Transcriptomics; Photosynthetic Gas Exchange Parameter; Tropinone Reductase; Alkaloid

期刊名称： FRONTIERS IN PLANT SCIENCE

ISSN： 1664-462X

年卷期： 2020 年 11 卷

页码：

收录情况： JCR（2021版）

摘要： Cold treatment (vernalization) is required for winter crops such as rapeseed (Brassica napusL.). However, excessive exposure to low temperature (LT) in winter is also a stress for the semi-winter, early-flowering rapeseed varieties widely cultivated in China. Photosynthetic efficiency is one of the key determinants, and thus a good indicator for LT tolerance in plants. So far, the genetic basis underlying photosynthetic efficiency is poorly understood in rapeseed. Here the current study used Associative Transcriptomics to identify genetic loci controlling photosynthetic gas exchange parameters in a diversity panel comprising 123 accessions. A total of 201 significant Single Nucleotide Polymorphisms (SNPs) and 147 Gene Expression Markers (GEMs) were detected, leading to the identification of 22 candidate genes. Of these, Cab026133.1, an ortholog of theArabidopsisgene AT2G29300.2 encoding a tropinone reductase (BnTR1), was further confirmed to be closely linked to transpiration rate. Ectopic expressingBnTR1inArabidopsisplants significantly increased the transpiration rate and enhanced LT tolerance under freezing conditions. Also, a much higher level of alkaloids content was observed in the transgenicArabidopsisplants, which could help protect against LT stress. Together, the current study showed that AT is an effective approach for dissecting LT tolerance trait in rapeseed and thatBnTR1is a good target gene for the genetic improvement of LT tolerance in plant.

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