Responses Characteristics of Leaf Water Potential in Different Growth Stages of  Lespedeza bicolor Seedlings to Drought Stress and Rewatering

doi:10.11733/j.issn.1007-0435.2023.07.018

Acta Agrestia Sinica ›› 2023, Vol. 31 ›› Issue (7): 2077-2085.DOI: 10.11733/j.issn.1007-0435.2023.07.018

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Responses Characteristics of Leaf Water Potential in Different Growth Stages of Lespedeza bicolor Seedlings to Drought Stress and Rewatering

FENG Shu-lin¹, ZHOU Ting², WANG Jun-li¹

1. Xianyang Vocational Technical College, Xianyang, Shaanxi Province 712100, China;
2. Xianyang Academy of Agricultural Sciences, Xianyang, Shaanxi Province 712100, China

Received:2023-03-09 Revised:2023-04-17 Online:2023-07-15 Published:2023-08-01

胡枝子幼苗不同生长阶段叶水势对干旱-复水的响应特征

冯树林¹, 周婷², 王军利¹

1. 咸阳职业技术学院, 陕西咸阳 712100;
2. 咸阳市农业科学研究院, 陕西咸阳 712100

作者简介:冯树林(1987-),男,汉族,贵州兴仁人,博士,讲师,主要从事林草生态工程研究,E-mail:shulinfeng06@163.com
基金资助:
咸阳职业技术学院博士科研基金项目(2021BK05)；陕西省教育厅一般专项科研计划项目(22 JK0609)资助

Abstract

Abstract: In order to reveal the response characteristics of Lespedeza bicolor seedlings to drought and rewatering,leaf water potential of L. bicolor was measured at its different growth stages under drought and rewatering conditions in a pot experiment carried out in a greenhouse. The results showed that soil moisture,drought duration,and growth stage,as well as the interactions among those three factors,had significant (P<0.01) effects on the leaf water potential of L. bicolor seedlings. With the droughtness became severe and severe,the seedling leaf water potential decreased and the water stress index increased. Under the condition of soil relative water content (SRWC) 40.00%,the leaf water potential of seedlings decreased to its lowest extent. In addition,in the early growth stage (EGS) in a duration for 60 days of drought stress,the fast growth stage (FGS) and the late growth stage (LGS) in the duration for 15 days of drought stress,the leaf water potential decreased by 0.93 MPa,0.79 MPa,and 0.57 MPa,respectively. However,the leaf water potential of the seedlings in all three growth stages recovered gradually over a few days after being rewatered. There was a strong correlation of the pace of recovery with the drought severity,length of drought duration,growth stage. In contrast,after 6 days of the subsequent rewatering,the leaf water potential of L. bicolor seedlings in EGS and LGS did not fully recovered to the control level. However,in FGS,the leaf water potential of L. bicolor seedlings recovered to the control level and showed morphological recovery and a physiological compensation effect in L. bicolor seedlings.

Key words: Leaf water potential, Growth stage, Drought stress, Compensation effect, Lespedeza bicolor

摘要： 为探究胡枝子(Lespedeza bicolor)叶水势对干旱-复水环境的响应特征，本研究通过盆栽试验，研究干旱-复水对胡枝子不同生长时期叶水势的影响。研究发现：土壤干旱程度、干旱持续时间和苗木生长阶段3个因素以及各因素间的相互作用对胡枝子叶水势产生了极显著影响(P<0.01)；随着干旱程度加剧，胡枝子叶水势呈下降趋势，水分胁迫指数呈上升趋势；40.00%土壤相对含水量处理的胡枝子叶水势下降幅度达到最大，其中生长初期干旱60 d以及生长中期和生长后期干旱15 d处理的苗木叶水势分别比对照下降了0.93 MPa，0.79 MPa和0.57 MPa；随着旱后复水时间的增加，胡枝子3个生长时期的叶水势逐渐恢复，恢复速率与干旱程度、干旱胁迫持续时间及苗木生长阶段密切相关。恢复供水6 d后，胡枝子生长初期和生长后期叶水势未恢复到对照水平，生长中期叶水势总体恢复到接近对照水平，出现超补偿效应。

关键词: 叶水势, 生长阶段, 干旱胁迫, 补偿效应, 胡枝子

CLC Number:

FENG Shu-lin, ZHOU Ting, WANG Jun-li. Responses Characteristics of Leaf Water Potential in Different Growth Stages of Lespedeza bicolor Seedlings to Drought Stress and Rewatering[J]. Acta Agrestia Sinica, 2023, 31(7): 2077-2085.

冯树林, 周婷, 王军利. 胡枝子幼苗不同生长阶段叶水势对干旱-复水的响应特征[J]. 草地学报, 2023, 31(7): 2077-2085.

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Responses Characteristics of Leaf Water Potential in Different Growth Stages of Lespedeza bicolor Seedlings to Drought Stress and Rewatering

胡枝子幼苗不同生长阶段叶水势对干旱-复水的响应特征

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