科尔沁沙地不同苜蓿品种越冬期根颈耐寒生理机制的研究  

A study of crown physiological mechanisms for cold tolerance of different alfalfa varieties in Horqin sandy land

作　　者：郝培彤 宁亚明[1] 高秋[2] 刘芳[2] 李玉龙 张尚雄 郑桂亮 王显国[1] HAO Pei-tong;NING Ya-ming;GAO Qiu;LIU Fang;LI Yu-long;ZHANG Shang-xiong;ZHENG Gui-liang;WANG Xian-guo(Department of Grassland Science,China Agricultural University,Beijing 100193,China;National Livestock Station,Beijing 100125,China;Forage and Feed Station of Tianjin,Tianjin 300210,China)

机构地区：[1]中国农业大学草业科学系,北京100193 [2]全国畜牧总站,北京100125 [3]天津市饲草饲料工作站,天津300210

出　　处：《草业学报》2019年第9期87-95,共9页Acta Prataculturae Sinica

基　　金：国家公益性行业(农业)科研专项(201403048-2)资助

摘　　要：以内蒙古科尔沁沙地种植的苜蓿品种为研究对象,模拟越冬季不同水分条件对不同秋眠级苜蓿根颈的影响,通过对根颈形态指标及生理指标的研究探讨不同苜蓿品种根颈的耐脱水规律。结果表明:模拟越冬季不同水分显著影响各品种根颈越冬保护性糖的积累及根颈的生理活性,尤其是蔗糖、棉子糖及水苏糖类寡糖的积累。抗寒级数较大的WL298、WL168根颈耐脱水较强,骑士T、公农一号根颈耐脱水性中等,而抗寒级数较小的巨能4015根颈耐脱水性较弱,WL363由于积累越冬保护性糖的含量高、再生恢复性较强表现出较强的越冬能力,根颈耐脱水性中等。越冬水分维持在田间持水量90%时,WL298、WL168、骑士T、公农一号的越冬保护性糖及返青后生产性能均强于巨能4015。越冬水分维持在田间持水量40%及以下各品种根颈收缩程度显著增加,WL298、WL168、WL363返青性能较好而骑士T、巨能4015则返青率相对较低。This research utilised alfalfa varieties which are widely grown in Horqin sandy land of Inner Mongolia,and explored the rate of occurrence of crown desiccation under simulated overwintering and the effect of different soil water contents at different fall dormancy of alfalfa.The results showed that during simulated overwintering,the cold-resistant WL298 and WL168 varieties exhibited strong desiccation,while for Knight T and Gongnong No.1 varieties crown desiccation was medium.Variety WL363 also displayed medium crown desiccation,attributable to a high accumulation of protective sugar,which enhanced regrowth performance.However,the degree of desiccation of variety Magnum 4015 was low.When soil moisture content was maintained at 90%of field capacity during the winter,WL298,WL168,Knight T and Gongnong No.1 displayed better protective sugars and regrowth performance than Magnum 4015.When the moisture conditions were maintained below 40%of field capacity,the degree of crown contraction of all varieties increased significantly.In these conditions,varieties WL298,WL168,and WL363 had better regrowth performance,while Knight T and Magnum 4015 had poor regrowth.

关 键 词：苜蓿 根颈 耐脱水性 耐寒生理 

分 类 号：S54[农业科学—作物学]