Effects of drought stress on root and leaf morphological characteristics and physiological changes in Paulownia fortunei seedlings
Journal Title: Journal of Henan Agricultural University - Year 2023, Vol 57, Issue 5
Abstract
[Objective] We aim to explore changes in root and leaf morphological traits and physiological processes in Paulownia fortunei seedlings under drought stress as well as their relationships. Unraveling the strategies of Paulownia fortunei in dealing with drought stress is important for subsequent researches on drought resistance for Paulownia fortunei breading. [Method] Paulownia fortunei seedlings were selected and suffered from different drought treatments with three water gradients by potted water control method, and root and leaf morphological traits and physiological processes for Paulownia fortunei seedlings were examined. [Result] (1) Under drought stress, leaf thickness decreased, specific leaf area and tissue density increased, while root diameter decreased, and specific root length and tissue density increased. (2) Drought stress severely restricted the photosynthetic activity in seedling leaves. With the increase of drought stress, maximum net photosynthetic rate decreased, dark respiration rate remained unchanged, light compensation point and light saturation point increased. (3)Under moderate drought stress, both fine root respiration rate and secretion rate all increased, while under severe drought stress, fine root respiration rate continued to increase and secretion rate decreased. [Conclusion] Drought stress causes a decrease in leaf photosynthetic capacity and an increase in specific leaf area in Paulownia fortunei seedlings. For roots under moderate drought, they tended to be thinner, and have longer root length per unit dry mass and higher respiration and secretion rates. When the drought was more severe, root respiration rate increased while root secretion rate was significantly reduced.
Authors and Affiliations
Haojie WANG, Yueshuang HOU, Jing CHEN, Jingjing CAO, Zhenli ZHAO, Guoqiang FAN, Deliang KONG
Keywords
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- EP ID EP769250
- DOI 10.16445/j.cnki.1000-2340.20230410.001
- Views 2
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