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Acta Horticulturae Sinica ›› 2026, Vol. 53 ›› Issue (4): 1143-1156.doi: 10.16420/j.issn.0513-353x.2025-0407

• Genetic & Breeding · Germplasm Resources · Molecular Biology • Previous Articles     Next Articles

Identification of the WSD Family Gene in Chinese Cabbage and Expression Analysis Under Drought Stress in Waxy Near-Isogenic Lines

WANG Ronghua, LIU Shuantao, ZHAO Zhizhong, LI Qiaoyun, XU Nianfang, ZHANG Zhigang, WANG Shubin*()   

  1. Shandong Key Laboratory of Bulk Open-field Vegetable Breeding,Ministry of Agriculture and Rural Affairs Key Laboratory of Huang Huai Protected Horticulture Engineering,Institute of Vegetables,Shandong Academy of Agricultural Sciences,Ji'nan 250100,China
  • Received:2025-05-09 Revised:2025-09-08 Online:2026-04-25 Published:2026-04-20
  • Contact: WANG Shubin

Abstract:

Wax synthase/diacylglycerol acyltransferase(WSD)is a key enzyme that catalyzes esterification reaction of long-chain fatty acids and fatty alcohols to synthesize wax esters. An increase in wax ester content helps to improve drought resistance in plant. Whole genome identification and chromosome localization,protein physicochemical properties,gene structure,protein conserved domain structure,collinear relationships,promoter cis-acting elements,tissue-specific expression and expression patterns under drought stress were analyzed based on bio-informatics methods. The results identified 18 WSD genes members classified into four subfamilies,which are unevenly distributed across seven chromosomes.The range of amino acids length and molecular weight for WSD is 415-554 and 46.57-62.86 kD,respectively. Gene structure analysis revealed that the WSD structure is relatively conserved. There are three pairs of tandem duplicated genes and six pairs of fragment duplicated genes in WSD. Collinearity analysis showed that six family members,including BrWSD1BrWSD4BrWSD8BrWSD16,BrWSD17 and BrWSD18,exhibited tripling of the WSD gene in Arabidopsis thaliana,while two family members,BrWSD3 and BrWSD7,exhibited doubling. Based on homology comparison and comparative transcriptome analysis,two candidate genes BrWSD1 and BrWSD9 were identified which may be involved in the drought stress response of Chinese cabbage.

Key words: Chinese cabbage, wax ester synthase, wax, gene family, drought