【作者】 兰剑； 沈艳； 谢应忠；

【Author】 SHEN Yan~(1,2),LAN Jian~(1,2),XIE Ying-zhong~(1,2) (1.Grassland Science Institute of Ningxia University,Yinchuan 750021,China;2.Key Laboratory of Northwest China Degraded Ecosystem Restoration and Rehabilitation of Ningxia University of Ministry of Education,Yinchuan 750021,China)

【机构】 宁夏大学草业科学研究所； 宁夏大学"西北退化生态系统恢复与重建"教育部重点实验室；

【摘要】 探讨干旱对高羊茅萌发的胁迫效应,为干旱地区牧草栽培和抗旱育种提供依据;采用PEG-6000对14个高羊茅品种种子进行模拟干旱胁迫,研究干旱胁迫对高羊茅萌发效应的影响。结果表明,高羊茅14个品种的相对发芽率均随干旱胁迫的加剧而降低,且在水势为-0.6Mpa处有明显的转折点;高羊茅种子萌发相对发芽率与干旱胁迫呈线性关系:y=70.412x+103.11,r=0.9888,耐旱适宜的水势范围为≥-0.40Mpa,半致死水势为-0.76Mpa,致死水势为-1.33Mpa。爱瑞3、交战Ⅱ和翠碧A是抗旱性较强的品种,贝克、强劲和爆发力是抗旱性较弱的品种。更多还原

【Abstract】 Approaching drought stress effect on germination of tall fescue to proffer reference for cultivated pasture and drought resistant breed.Simulation drought experiment on 14 varieties of tall fescue seeds by PEG-6000 researched its germination effect under drought resistance.The results showed that the relative germination rate of all tall fescue varieties declined with intensifying drought stress level and water potential -0.6Mpa was the turning point;the relative germination rate of tall fescue existed linear relationship with drought stress:y=70.412x+103.11,r=0.9888.The sensible water potential range was≥-0.40Mpa for tall fescue under drought stress.LC50 of water potential was -0.76 Mpa,the lethal water potential was -1.33Mpa.AridⅢ,CrossfireⅡand Traple A had stronger drought resistant ability,but Pixie,Infero and Poppoint had weaker drought resistant ability.更多还原