Biochemical defense responses in cotton: secondary metabolite and antioxidant shifts under thrips infestation

• 全文链接

棉花生化防御反应：蓟马侵染下的次生代谢产物和抗氧化物转移

关键词：

来源：

PHYTOPARASITICA

全文链接：

//agri.nais.net.cn/topic/downloadFile/96f7b283-121d-43a2-ac4c-fc70623c411d

来源地址：

https://link.springer.com/article/10.1007/s12600-025-01318-y

资源所属：

棉花遗传育种

类型：

学术文献

语种：

英语

原文发布日期：

2025-09-12

摘要：

Thrips are among the most destructive pests of cotton, causing significant losses in yield and fiber quality through direct feeding. This study aimed to investigate the biochemical responses associated with thrips resistance in two cotton genotypes- LH 2107 (susceptible) and LD 491 (tolerant). Key defense-related parameters, including phenolic metabolism, antioxidant activity, and volatile compounds, were analyzed under both uninfested and thrips-infested conditions. Activities of phenylalanine ammonia-lyase and tyrosine ammonia lyase increased significantly in LD 491 during an infestation, indicating enhanced phenolic biosynthesis. Both genotypes exhibited increased levels of total phenols, o-dihydroxy phenols and total flavanols from 15 days post-infestation, with LD 491 showing significantly higher concentrations than LH 2107. Antioxidant assays revealed a marked rise in DPPH free radical scavenging activity, FRAP activity, total reducing power, superoxide anion radical scavenging activity, and hydroxyl radical scavenging activity, with LD 491 demonstrating the greatest enhancement. GC-MS analysis of volatile compounds showed genotype-specific differences, with the compound palmitin, 2-mono- uniquely present in LD 491 under both conditions. These findings suggested that elevated phenolic content, antioxidant activity, and specific volatiles contribute to thrips resistance in cotton. The identified biochemical markers may serve as valuable tools for screening and breeding thrips-resistant cotton genotypes.