Growth and non-structural carbohydrates response patterns of Eucommia ulmoides under salt and drought stress

作者：Xuejie Zhang, Hao Qin, Zhenchao Kan, Dan Liu, Bingxin Wang, Shoujin Fan, Peipei Jiang · 发表于：Frontiers in Plant Science · 年份：2024 · DOI：10.3389/fpls.2024.1436152 · 被引用次数：13 · 研究领域：Plant Water Relations and Carbon Dynamics、Plant nutrient uptake and metabolism、Plant Stress Responses and Tolerance

Introduction: Salinity and droughts are severe abiotic stress factors that limit plant growth and development. However, the differences and similarities of non-structural carbohydrates (NSCs) responses patterns of trees under the two stress conditions remain unclear. Methods: seedlings planted in field under drought and salt stress with different intensities and durations. Results and discussion: tended to enhance its stress resistance by increasing proline concentration and leaf thickness or density but decreasing investment in belowground biomass in short-term stress. During short-term drought and salt stress, the aboveground organs showed different NSCs response characteristics, while belowground organs showed similar change characteristics: the starch (ST) and NSCs concentrations in the coarse roots decreased, while the ST and soluble sugar (SS) concentrations in the fine roots increased to enhance stress resistance and maintain water absorption function. As salt and drought stress prolonged, the belowground organs represented different NSCs response patterns: the concentrations of ST and SS in fine roots decreased as salt stress prolonged; while ST in fine roots could still be converted into SS to maintain water absorption as drought prolonged, resulting in an increase of SS and a decrease of ST. Significant positive relationships were found between growth and the SS and total NSCs concentrations in leaves and branches, however, no significant correlations were found bet...