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Plant function and evolutionary biology
RESEARCH ARTICLE

LncRNA improves cold resistance of winter wheat by interacting with miR398

Qiuwei Lu A , Fuye Guo A , Qinghua Xu A B and Jing Cang https://orcid.org/0000-0002-3068-0620 A B
+ Author Affiliations
- Author Affiliations

A College of Life Science, Northeast Agricultural University, Harbin 15000, Heilongjiang, China.

B Corresponding authors. Email: xuqinghua@neau.edu.cn; cangjing2003@163.com

Functional Plant Biology 47(6) 544-557 https://doi.org/10.1071/FP19267
Submitted: 16 September 2019  Accepted: 21 December 2019   Published: 29 April 2020

Abstract

One of the important functions of long non-coding RNA (lncRNA) is to be competing endogenous RNAs (ceRNAs). As miR398 is reported to respond to different stressors, it is necessary to explore its relationship with lncRNA in the cold resistance mechanism of winter wheat. Tae-miR398-precursor sequence was isolated from the winter wheat (Triticum aestivum). RLM-RACE verified that tae-miR398 cleaved its target CSD1. Quantitative detection at 5°C, –10°C and –25°C showed that the expression of tae-miR398 decreased in response to low temperatures, whereas CSD1 showed an opposite expression pattern. LncR9A, lncR117 and lncR616 were predicted and verified to interact with miR398. tae-miR398 and three lncRNAs were transferred into Arabidopsis thaliana respectively. The lncR9A were transferred into Brachypodium distachyom. Transgenic plants were cultivated at –8°C and assessed for the expression of malondialdehyde, chlorophyll, superoxide dismutase and miR398-lncRNA-target mRNA. The results demonstrate that tae-miR398 regulates low temperature tolerance by downregulating its target, CSD1. lncRNA regulates the expression of CSD1 indirectly by competitively binding miR398, which, in turn, affects the resistance of Dn1 to cold. miR398-regulation triggers a regulatory loop that is critical to cold stress tolerance in wheat. Our findings offer an improved strategy to crop plants with enhanced stress tolerance.

Additional keywords: ceRNA, cold stress, CSD1, lncRNAs, long non-coding RNAs, Triticum aestivum.


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