Adaptive Responses of Root Phenotypic Plasticity of Leymus secalinus Seedlings to Salt Stress

doi:10.11733/j.issn.1007-0435.2026.04.010

Acta Agrestia Sinica ›› 2026, Vol. 34 ›› Issue (4): 1242-1251.DOI: 10.11733/j.issn.1007-0435.2026.04.010

Adaptive Responses of Root Phenotypic Plasticity of Leymus secalinus Seedlings to Salt Stress

ZHANG Jing^1,2, CONG Ying-li², JIA Sha-er², LI Xiang², HUANG Qing-liang¹, AYINAZHA Elawudun¹, ABULAITI Abuduhaibier¹, YERKASHI Dalieli¹, ZHENG Wei^1,3

1. College of Grassland Science, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China;
2. Grassland General Station of Xinjiang Uygur Autonomous Region, Urumqi, Xinjiang 830049, China;
3. Xinjiang Key Laboratory of Grassland Resources and Ecology, Urumqi, Xinjiang 830052, China

Received:2025-04-17 Revised:2025-06-06 Published:2026-04-15

赖草幼苗根系表型可塑性对盐胁迫的适应性响应

张晶^1,2, 丛英利², 加沙尔², 李翔², 黄清亮¹, 阿依娜扎尔·艾拉吾敦¹, 阿卜来提·阿卜杜海比尔¹, 叶尔卡什·达列力¹, 郑伟^1,3

1. 新疆农业大学草业学院, 新疆乌鲁木齐 830052;
2. 新疆维吾尔自治区草原总站, 新疆乌鲁木齐 830049;
3. 新疆维吾尔自治区草地资源与生态重点实验室, 新疆乌鲁木齐 830052

通讯作者: 郑伟，E-mail：zw065@126.com
作者简介:张晶（1986-），女，汉族，甘肃武威人，高级畜牧师，博士研究生，主要从事草地资源管理与草原保护研究，E-mail：cyzz505@126.com；
基金资助:
新疆维吾尔自治区2024年林业发展补助资金（林草科技）项目（项目编号XJLYKJ-2024-07）；新疆维吾尔自治区2023年林业发展补助资金（林草科技）项目（项目编号XJLYKJ-2023-16）资助

Abstract

Abstract: The restoration of saline grasslands relies on effective soil amelioration， precise seeding timing， and successful seedling establishment. In this study， the pioneer grass species Leymus secalinus was used as test material， and low， medium， and high salinity levels of salt stress were set up using a 1∶2 ratio of NaCl and Na₂SO₄. The effects of salt stress and its interaction with seedling age on root system phenotypic plasticity were investigated. Our results showed that salt stress made roots grow shallower. Seedling age was the main factor controlling root biomass distribution （P<0.001）. Salt alone and its interaction with age were only significant in some cases. Salt and age both reduced root length， surface area， and volume （P<0.01）. Their interaction had the strongest effect on root volume （F=36.878）. Salt damage increased nonlinearly as the seedling grew. Root tip number decreased with higher salt. Older seedlings were more sensitive to salt. Root angle significantly reduced at the two- and three-leaf stages. Also， root fractal dimension showed a nonlinear response， and increased under low salt but decreased under medium and high salt （P<0.05）. This study revealed the phased adaptation strategies of Leymus secalinus seedlings under salt stress， providing a basis for enhancing the application potential of Leymus secalinus in ecological restoration of saline grasslands.

Key words: Leymus secalinus, Salt stress, Seedling age, Root system, Phenotypic plasticity

摘要： 为指导盐渍化草地修复中土壤特性改良、播种时期确定及幼苗保育等实践，本研究以盐渍化草地生态系统先锋物种赖草（Leymus secalinus）为研究对象，采用NaCl与Na₂SO₄按1∶2比例配制的低、中、高盐度溶液进行盆栽模拟试验，探究了盐胁迫及其与苗龄的交互作用对幼苗根系表型可塑性的影响。结果表明：盐胁迫使根系分布浅层化，苗龄是根系生物量垂直分配的主导因子（P<0.001），盐分主效应及交互作用仅在特定条件下显著。盐浓度和苗龄对根长、根表面积和根体积均存在显著独立与交互抑制效应（P<0.01），其中根体积的交互效应最强（F=36.878），显示盐害随幼苗生长呈非线性增强。根尖数随盐度增加而减少，高龄苗更敏感；根角度在二、三叶期受盐抑制显著。根系分形维数呈低盐升高、中高盐降低的非线性响应（P<0.05）。本研究揭示了盐胁迫下赖草幼苗的阶段性适应策略，为提升赖草在盐碱地生态修复中的应用潜力提供依据。

关键词: 赖草, 盐胁迫, 苗龄, 根系, 表型可塑性

CLC Number:

S812

ZHANG Jing, CONG Ying-li, JIA Sha-er, LI Xiang, HUANG Qing-liang, AYINAZHA Elawudun, ABULAITI Abuduhaibier, YERKASHI Dalieli, ZHENG Wei. Adaptive Responses of Root Phenotypic Plasticity of Leymus secalinus Seedlings to Salt Stress[J]. Acta Agrestia Sinica, 2026, 34(4): 1242-1251.

张晶, 丛英利, 加沙尔, 李翔, 黄清亮, 阿依娜扎尔·艾拉吾敦, 阿卜来提·阿卜杜海比尔, 叶尔卡什·达列力, 郑伟. 赖草幼苗根系表型可塑性对盐胁迫的适应性响应[J]. 草地学报, 2026, 34(4): 1242-1251.

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Adaptive Responses of Root Phenotypic Plasticity of Leymus secalinus Seedlings to Salt Stress

赖草幼苗根系表型可塑性对盐胁迫的适应性响应

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