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紫穗槐幼苗根系形态对NaCl盐胁迫的响应
张佳鹏1,2, 高永1,2, 党晓宏1,2, 张格3, 王涛1
1.内蒙古农业大学 沙漠治理学院, 内蒙古 呼和浩特 010019;2.内蒙古自治区风沙物理学重点实验室, 内蒙古 呼和浩特 010019;3.中国林业科学研究院 沙漠林业试验中心, 内蒙古 磴口 015200
摘要:
[目的] 探究紫穗槐幼苗根系形态对NaCl盐胁迫的适应特征,为盐渍化地区植被优化及恢复提供理论依据。[方法] 以1 a生紫穗槐幼苗为试材,分析紫穗槐幼苗株高、基径和根长、表面积、体积、根尖数等重要的根系形态特征指标。[结果] 随着盐浓度的增加,紫穗槐幼苗株高、基径和总根、中根各构型指标均呈现先升高后下降的趋势;盐浓度为0.3%时,除细根体积外,各指标达到最大值,且均表现显著促进作用(p<0.05);盐浓度达到0.9%时,各指标受到了显著抑制(p<0.05)。[结论] 当盐浓度为0.3%时,对紫穗槐根系生长有促进作用;当盐浓度达到0.9%时,其生长明显受到抑制。
关键词:  紫穗槐  盐胁迫  根系形态  植被优化
DOI:10.13961/j.cnki.stbctb.2020.02.008
分类号:Q945.78
基金项目:948项目"人工调控荒漠灌丛生态空间构型技术引进"(2015-4-22);国家自然科学基金项目"荒漠灌丛空间构型对其‘肥岛’发育的作用机制"(41967009)
Responses of Root Morphology of Amorpha Fruticosa to NaCl Saline Stress
Zhang Jiapeng1,2, Gao Yong1,2, Dang Xiaohong1,2, Zhang Ge3, Wang Tao1
1.College of Desert Control Science and Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010019, China;2.Key Laboratory of Wind and Sand Physics of Inner Mongolia Autonomous Region, Hohhot, Inner Mongolia 010019, China;3.Experimental Center of Desert Forestry, Chinese Academy of Forestry, Dengkou, Inner Mongolia 015200, China
Abstract:
[Objective] The adaption of Amorpha fruticosa through root morphological responses to saline stress was explored, in order to provide support for vegetation optimization and restoration in saline areas.[Methods] we used the annual Amorpha fruticosa seedlings as test materials, and analyzed plant height, basal diameter and the root morphological characteristics such as root length, surface area, volume, and number of root tips of Amorpha fruticosa seedlings under saline stress.[Results] As the salt concentration increases, the plant height, basal diameter, and total root and middle root configuration indexes of Amorpha fruticosa increased first and then decreased. When the saline concentration was 0.3%, except for the fine root volume, all other indexes reached the maximum value, and all showed significant promotion effects (p<0.05). When the saline concentration was 0.9%, all indicators were significantly inhibited (p<0.05).[Conclusion] When the saline concentration was 0.3%, the root growth of Amorpha fruticosa was significantly promoted; when the concentration was higher than 0.5%, the root system showed different degrees of growth declining; when the saline concentration reached 0.9%, its growth was significantly inhibited.
Key words:  Amorpha fruticosa  saline stress  root morphology  vegetation optimization