低温干旱环境对紫花苜蓿根颈耐寒性的影响

doi:10.11733/j.issn.1007-0435.2021.04.012

草地学报 ›› 2021, Vol. 29 ›› Issue (4): 724-733.DOI: 10.11733/j.issn.1007-0435.2021.04.012

低温干旱环境对紫花苜蓿根颈耐寒性的影响

徐洪雨¹, 甄莉丽², 李钰莹¹, 董宽虎¹, 李向林^3*

1.山西农业大学草业学院, 山西太谷 030801;
2.对外经济贸易大学外语学院, 北京 100029;
3.中国农业科学院北京畜牧兽医研究所, 北京100193

收稿日期:2020-09-11 修回日期:2020-11-10 发布日期:2021-06-02
通讯作者: * E-mail:lxl@caas.cn
作者简介:徐洪雨(1986-),男,汉,内蒙古赤峰人,博士,主要从事牧草逆境生理方面的研究,E-mail:xuhongyu@sxau.edu.cn
基金资助:
国家重点研发计划(2016YFC0500608);山西农业大学科技创新基金项目(2020BQ64);现代农业产业技术体系建设专项资金(CARS-34)资助

Effect of Freeze-drying Environment on Freezing Tolerance of Alfalfa Crowns

XU Hong-yu¹, ZHEN Li-li², LI Yu-ying¹, DONG Kuan-hu¹, LI Xiang-lin^3*

1. College of Grassland Science, Shanxi Agricultural University, Taigu, Shanxi Province 030801, China;
2. School of Foreign Studies, University of International Business and Economics, Beijing 100029, China;
3. Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100093, China

Received:2020-09-11 Revised:2020-11-10 Published:2021-06-02
Contact: * E-mail:lxl@caas.cn

摘要/Abstract

摘要： 为了解冬季土壤干旱对紫花苜蓿(Medicago sativa L.)越冬的影响,本研究在实验室内通过控温和更换表土试验模拟低温干旱环境,结合抗冷冻测试、细胞损伤、根颈组织含水量和渗透调节物质变化等,研究低温干旱环境对‘WL440HQ’和‘肇东’苜蓿根颈耐寒性的影响及原因。研究结果表明:低温干旱环境降低苜蓿根颈的耐寒性;与‘肇东’苜蓿相比,低温干旱环境下‘WL440HQ’苜蓿根颈具有较低的耐寒性,根颈组织含有较少的可溶性糖和较高的失水速率,细胞受到不可逆损伤,细胞液相对渗透率超过50%;在低温干旱环境下,根颈内的脯氨酸和可溶性蛋白含量在2个苜蓿品种间差异显著,2种物质可能与‘肇东’苜蓿在低温环境下耐寒性更强有关。综上,为提高苜蓿的越冬能力,建议除在初冬季节灌冻水外,冬季还应适时补水。

关键词: 紫花苜蓿, 低温干旱, 耐寒性, 越冬, 越冬管理

Abstract: In order to learn influence of soil drying in winter on the overwintering of Medicago sativa L.,freeze-drying environment was simulated by means of temperature control and topsoil replacement in laboratory,influence of freeze-drying environment on freezing tolerance of crowns of alfalfa ‘WL440HQ’ and ‘Zhaodong’ and the causes were analyzed in combination with freezing test,cell damage,tissue moisture content and osmotic regulating substances. Results showed that freeze-drying environment was adverse to the freezing tolerance of alfalfa crowns. Comprared with ‘Zhaodong’,‘WL440HQ’ crowns had fewer soluble sugar and higher water loss rate under the freeze-drying environment,and cells were irreversibly damaged with a relative permeability of cell fluid exceeding 50%. In addition,there were significant differences in contents of proline and soluble protein between two cultivars,and these may be related to the better performance of ‘Zhaodong’ in cold or freezing environment. In order to improve the alfalfa winter survival,it is suggested that water should be replenished in winter in addition to irrigation in early winter.

Key words: Alfalfa, Freeze-drying, Freezing tolerance, Overwintering, Management during winter

中图分类号:

S963.22+3.3

徐洪雨, 甄莉丽, 李钰莹, 董宽虎, 李向林. 低温干旱环境对紫花苜蓿根颈耐寒性的影响[J]. 草地学报, 2021, 29(4): 724-733.

XU Hong-yu, ZHEN Li-li, LI Yu-ying, DONG Kuan-hu, LI Xiang-lin. Effect of Freeze-drying Environment on Freezing Tolerance of Alfalfa Crowns[J]. Acta Agrestia Sinica, 2021, 29(4): 724-733.

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低温干旱环境对紫花苜蓿根颈耐寒性的影响

Effect of Freeze-drying Environment on Freezing Tolerance of Alfalfa Crowns

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