17份食用向日葵杂交种苗期抗旱性综合评价  

Comprehensive evaluation of drought resistance of seventeen confectionary sunflower hybrid at seedling stage

作　　者：宋殿秀[1] 崔良基[1] 王德兴[1] 刘金刚[1] 孙恩玉[1] 依兵[1] SONG Dianxiu;CUI Liangji;WANG Dexing;LIU Jingang;SUN Enyu;YI Bing(Crop Research Institute of Liaoning Academy of Agricultural Sciences, Shenyang, Liaoning 110161, China)

机构地区：[1]辽宁省农业科学院作物研究所,辽宁沈阳110161

出　　处：《干旱地区农业研究》2021年第3期18-22,共5页Agricultural Research in the Arid Areas

基　　金：辽宁省自然科学基金指导计划(20180550888);国家特色油料产业技术体系(CARS-14)。

摘　　要：以17份食葵杂交种为试材,采用1/2 Hoagland营养液水培的方式,以PEG-6000模拟干旱,分析苗期根系形态和生物量对干旱胁迫的响应,并对食葵杂交种的抗旱能力进行综合评价。结果表明:苗期食葵根系形态指标受干旱影响程度要高于生物量,根系形态各指标受干旱影响程度顺序为:根体积>根平均直径>根尖数>总根长>根表面积,生物量各指标受干旱影响顺序为:地上部干重>根冠比>整株干重>根干重。Con15的综合抗旱能力D值为0.58,综合抗旱能力最强,而Con13的综合抗旱能力D值为0.25,综合抗旱能力最弱。总根长、根干重、整株干重、根尖数和根表面积与综合抗旱能力D值呈极显著正相关,相关系数分别为0.81、0.70、0.66、0.63和0.60,地上部干重与综合抗旱能力D值呈显著正相关,相关系数为0.58。苗期综合抗旱能力较强的食葵杂交种为Con15、Con03、Con16和Con14。Studying the effect of drought stress on sunflower root morphology and biomass and identifying drought resistance sunflower are of great significance for drought resistance breeding and water-saving cultivation of sunflower.In this study,17 confectionary sunflower hybrids were used,the method of 1/2 Hoagland nutrient solution hydroponic was used to simulate drought stress with PEG-6000,and the response of root morphology and biomass at seedling stage to drought stress was analyzed.A comprehensive evaluation of the drought resistance of these hybrids was conducted.The results showed that the root morphology of confectionary sunflower at seedling stage was more sensitive to drought stress than the biomass.The sensitivity of root morphology to drought stress was ranked in the order of root volume>average root diameter>root tips number>total root length>root surface area.The sensitivity of biomass to drought stress in oder was shoot dry weight>root-to-shoot ratio>plant dry weight>root dry weight.The comprehensive drought resistance capacity D value was highly significant positively correlated with total root length,root dry weight,plant dry weight,root tips number,and root surface area,with the correlation coefficients being 0.81,0.70,0.66,0.63,and 0.60,respectively.The shoot dry weight was significantly positively correlated with the comprehensive drought resistance capacity D values,with the correlation coefficient being 0.58.The Con15,Con03,Con16 and Con14 were confectionary sunflowers with strong comprehensive drought resistance at seedling stage.

关 键 词：食用向日葵 干旱胁迫 根系形态 生物量 抗旱鉴定 

分 类 号：S565.6[农业科学—作物学] S503.4