文献类型： 外文期刊

作者： Yao, Jinliang ¹ ; Cui, Rui ¹ ; Fang, Beibei ¹ ; Wang, Sheliang ¹ ; Ye, Xiangsheng ¹ ; Liu, Zhaojun ¹ ; Xu, Fangsen ¹ ;

作者机构： 1.Huazhong Agr Univ, Microelement Res Ctr, Natl Key Lab Crop Genet Improvement, Wuhan 430070, Hubei, Peoples R China

2.Xinjiang Acad Agr Sci, Biol Breeding Lab, Urumqi 830091, Xinjiang, Peoples R China

3.Zhengzhou Univ, Sch Agr Sci, Zhengzhou 450001, Henan, Peoples R China

关键词： Brassica napus; Boron deficiency; Leaf curling; Leaf epinasty; Adaxial side; Auxin; WRKY

期刊名称：CROP JOURNAL （ 影响因子：5.6； 五年影响因子：6.0 ）

ISSN： 2095-5421

年卷期： 2025 年 13 卷 4 期

页码：

收录情况： SCI

摘要： Brassica napus (oilseed rape) is sensitive to boron (B) deficiency and exhibits young leaf curling in response to low-B stress at the seedling stage, which leads to reduced photosynthesis and plant growth. So far, no gene has been identified to be involved in B deficiency induced leaf curling. Our previous results showed the transcription factor BnaA1.WRKY53 might be involved in B-deficiency tolerance. However, altered BnaA1.WRKY53 expression does not influence B concentration in shoot, root and leaf cell walls, which suggests BnaA1.WRKY53 might be involved in other biological processes. Indeed, phenotypic and anatomical analyses revealed that BnaA1.WRKY53 negatively regulated the leaf curling induced by leaf epinasty by suppressing the overexpansion of palisade cells under B deficiency. Further transcriptome enrichment analysis of differentially expressed genes (DEGs) between wild-type and BnaA1.WRKY53 overexpression line showed auxin response pathway was enriched. In addition, Arabidopsis DR5::GFP auxin reporter line showed B deficiency caused predominant auxin signal accumulation in the adaxial side and concomitant adaxial cell expansion, which indicated that B deficiency may induce leaf curling by altering auxin distribution. Phytohormone quantification and gene expression analysis demonstrated that BnaA1.WRKY53 prevent auxin overaccumulation in leaves by suppressing auxin biosynthetic genes under B deficiency. Furthermore, exogenous 1-naphthlcetic acid (NAA) treatment experiments revealed that high auxin could induce leaf curling and BnaA1.WRKY53 expression. Overall, these findings demonstrate that auxin and the transcription factor BnaA1.WRKY53 synergistically regulate leaf curling to maintain an optimal leaf area under B deficiency, and provide novel insights into the resistance mechanisms against B-deficiency-induced leaf curling in oilseed rape. (c) 2025 Crop Science Society of China and Institute of Crop Science, CAAS. Production and hosting by Elsevier B.V. on behalf of KeAi Communications Co., Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).