甜高粱耐盐材料的筛选及芽苗期耐盐性相关分析  

Screening sweet sorghum varieties of salt tolerance and correlation analysis among salt tolerance indices in sprout stage

作　　者：王秀玲[1] 程序[2] 李桂英[3] 

机构地区：[1]中国农业大学资源与环境学院,北京100193 [2]中国农业大学农学与生物技术学院生物质工程中心,北京100193 [3]中国农业科学院作物科学研究所生物质能源研究中心国家农作物基因资源与基因改良重大科学工程,北京100081

出　　处：《中国生态农业学报》2010年第6期1239-1244,共6页Chinese Journal of Eco-Agriculture

基　　金：“十一五”国家科技支撑计划项目(2006BAD07A04,2009BADA7B01);公益性行业(农业)科研专项经费项目(3-30-1)资助

摘　　要：在0、200mmol·L-1NaCl盐浓度下对39个甜高粱材料进行了耐盐性鉴定,并探讨了甜高粱耐盐指标的相关性,以初步筛选的耐盐级别不同的10个甜高粱材料为对象,研究了0、70mmol·L-1、140mmol·L-1、210mmol·L-1NaCl盐浓度对甜高粱芽苗期形态指标及其盐害率的影响,最后利用盐害率的隶属函数值综合评价了10个甜高粱材料的耐盐性。结果发现,"丽欧"、"泰斯"耐盐性最强,"BJK236"、"Mer-72-2"对盐胁迫较敏感。盐胁迫下甜高粱发芽率、发芽指数、发芽势、活力指数、芽长、根长、芽鲜重、根鲜重8个指标均与对照差异显著(P<0.05)。随着盐浓度增加,这8项指标的盐害率增大,且与盐浓度均极显著相关(P<0.01);其中随着盐浓度的增大,发芽相对盐害率与发芽势、发芽指数、活力指数盐害率的相关性越来越大,由显著相关(P<0.05)到极显著相关(P<0.01)。综合评价10个甜高粱材料耐盐强弱顺序为:"泰斯">"甜132">"BJK19">"BJK156">"考利">"吉甜3">"威利">"凯勒">"戴尔">"吉甜2"。Thirty-nine sweet sorghum varieties were screened for salinity tolerance under 0 and 200 mmol·L-1 NaCl. Effects of salinity stress of three NaCl concentrations of 70 mmol·L-1, 140 mmol·L-1, 210 mmol·L-1 on morphological parameters and their salt toxicity rates of ten selected varieties were investigated with water as the control. Finally, comprehensive evaluation on salt tolerance of sweet sorghum varieties was conducted by using Subordinate Function Value method. The results show that ＂Rio＂ and ＂Theis＂ are most salinity tolerant and ＂BJK236＂, ＂Mer-72-2＂ are most salinity sensitive among thirty-nine sweet sorghum varieties. Germination rate, germination index, germination energy, vigor index, bud length, root length, bud fresh weight, root fresh weight of sweet sor-ghum varieties under salt stress are significantly different （P0.05） from those under control. Moreover, with increase of salt concen-trations, salt toxicity rates of above eight indicators are enhanced, which are significantly correlated with salt concentration （P0.01）. The correlation coefficients of toxicity rates of germination rate, germination energy, germination index, vigor index to salt concen-tration increase from significant correlation （P0.05） to highly significant correlation （P0.01） with increasing salt concentration. Comprehensive evaluation indicates the salt-tolerance order of ten sweet sorghum varieties as： ＂Theis＂＂Tian132＂＂BJK19＂ ＂BJK156＂ ＂Cowley＂＂Jitian3＂＂Wray＂＂Keller＂＂Dale＂＂Jitian2＂.

关 键 词：甜高粱 耐盐性 芽苗期 发芽势 发芽指数 活力指数 盐害率 

分 类 号：S514[农业科学—作物学] Q945.78[生物学—植物学]