PEG-6000模拟干旱胁迫下不同加工番茄种子萌发期抗旱性评价  

Evaluation of Drought Resistant of Different Processing Tomato at Seed Germination Stage under PEG-6000 Stress

作　　者：彭玉梅[1] 石国亮[1] 崔辉梅[1] 

机构地区：[1]石河子大学农学院,新疆石河子832003

出　　处：《种子》2013年第7期44-49,共6页Seed

基　　金：留学回国人员科技活动项目(编号:2010LX005)

摘　　要：研究不同PEG-6000浓度胁迫下3个加工番茄种子的耐旱性。实验设置6个PEG-6000浓度梯度0、5%、7.5%、10%、12.5%、15%,对3个加工番茄品种种子进行干旱胁迫处理,测定其种子发芽率、发芽势、发芽指数和活力指数等指标。结果表明:(1)随着PEG浓度的升高,3个加工番茄种子的发芽率、发芽势、发芽指数、活力指数、胚根鲜重和干重、下胚轴鲜重和干重均呈下降趋势,不同品种抗旱性的变化趋势相似,但变化幅度有明显差异;(2)采用模糊数学隶属函数值法综合评价初步认为,这3个加工番茄耐旱性由大到小依次为:KT-16>KT-18>KT-70;(3)种子萌发耐旱指数和常用的萌发抗旱指标有很高的相关性,且能很好的反映不同加工番茄干旱胁迫下的差别,可作为加工番茄萌发阶段抗旱性鉴定的筛选方法。To study the drought resistance of the seeds of 3 processing tomato under different PEG-6000 concentrations osmotic stress.The experiment set six PEG-6000 concentrations osmotic stress,which are respectively 0、5% 、7.5% 、10.0% 、12.5% 、15.0%;The seeds of processing tomato were treated under drought resistance and the seeds germination rate,germination potential,germination index,vitality index were measured.It was shown that（1） with the increasing of PEG concentrations,the germination rate,germination potential,germination index,vitality index,root fresh weight and dry weight,hypocotyl fresh weight and dry weight all decreased gradually.The change tendencies of different drought resistance among difference provenance were similar,but the range of changes was different remarkably;（2） under different osmotic potentials（PEG-6000） to evaluate their drought resistance using the fussy subordinate function,the results indicated that the drought resistance of the 3 processing tomato decreased in the order as： KT-16,KT-18,KT-70;（3） the drought resistance index could better reflect the differences among different processing tomato under PEG concentrations osmotic stress and could be used as a filtrating method appraising drought resistance in processing tomato germination stage.

关 键 词：加工番茄 渗透胁迫 萌发期 聚乙二醇(PEG-6000) 

分 类 号：S641.2[农业科学—蔬菜学]