Genetic and morpho-physiological attributes of drought resistance in Capsicum accessions

IF 6.2 1区农林科学 Q1 HORTICULTURE

Horticultural Plant Journal Pub Date : 2025-02-21 DOI:10.1016/j.hpj.2024.11.008

Kyu Kyu Thin, Soobin Lee, Je Min Lee

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引用次数: 0

Abstract

Drought stress is one of the factors limiting pepper production in water-stressed regions. It affects growth and development by inducing morphological, biochemical, and physiological changes. Breeding drought-resistant varieties is a sustainable strategy to mitigate drought, therefore, reliable evaluation systems are essential to identify drought-resistant pepper accessions. In this study, 100 pepper accessions were screened for drought resistance under highly controlled conditions at the vegetative stage. Selected accessions exhibited a significantly higher recovery rate after water-deficiency and showed durable resistance under greenhouse conditions. Correlation analysis between drought resistance with morphological and physiological traits showed that the recovery rate was positively correlated with root length and relative water content, and negatively correlated with plant height and leaf area. Gene expression analysis showed that the drought-resistant accession exhibited higher expression levels of drought-responsive genes under drought stress. Among the accessions, anthocyanin-accumulating peppers showed more significant drought resistance compared to other accessions. When the MYB transcription factor An2, the genetic determinant of anthocyanin accumulation, was silenced, drought resistance was significantly reduced. Drought-resistant accessions with favorable adaptive traits identified in this study will be valuable in various breeding programs to generate new pepper cultivars to cope with climate change.

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辣椒品种抗旱性的遗传和形态生理特征

干旱胁迫是制约缺水地区辣椒生产的因素之一。它通过诱导形态、生化和生理变化来影响生长发育。培育抗旱品种是缓解干旱的可持续策略，因此，可靠的评价系统是鉴定抗旱辣椒品种的必要条件。本研究以100份辣椒材料为材料，在高度控制的营养期条件下进行抗旱性筛选。所选材料在温室条件下表现出较高的缺水恢复率和持久的抗性。抗旱性与形态生理性状的相关分析表明，恢复率与根长、相对含水量呈正相关，与株高、叶面积呈负相关。基因表达分析表明，抗旱品种在干旱胁迫下表现出较高的干旱响应基因表达水平。其中，花青素积累型辣椒的抗旱性较其他品种显著。当MYB转录因子An2（花青素积累的遗传决定因素）被沉默时，抗旱性显著降低。本研究鉴定的具有良好适应性状的抗旱材料将为辣椒新品种的选育提供参考，以适应气候变化。

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来源期刊

Horticultural Plant Journal Environmental Science-Ecology

CiteScore

9.60

自引率

14.00%

发文量

293

审稿时长

33 weeks

期刊介绍： Horticultural Plant Journal (HPJ) is an OPEN ACCESS international journal. HPJ publishes research related to all horticultural plants, including fruits, vegetables, ornamental plants, tea plants, and medicinal plants, etc. The journal covers all aspects of horticultural crop sciences, including germplasm resources, genetics and breeding, tillage and cultivation, physiology and biochemistry, ecology, genomics, biotechnology, plant protection, postharvest processing, etc. Article types include Original research papers, Reviews, and Short communications.