烟草外引种质资源抗旱性鉴定与评价

Identification and evaluation of drought resistance for imported tobacco germplasm resources

为了发掘抗旱烟草种质资源,以24份国外引进烟草品种为材料,在种子萌发期采用PEG-6000溶液模拟干旱胁迫。结果表明,模拟干旱胁迫下,烟草种质的各项萌发性状表型值均有不同程度降低,其中对发芽率和全苗长的影响相对较小;对幼苗鲜重影响较大。根据各项指标胁迫系数的隶属函数值,将供试烟草品种分为抗旱、中度抗旱、不抗旱和易干旱种质4类,共筛选出抗旱种质11个,中度抗旱种质9个,不抗旱种质3个,易干旱种质1个。

In order to discover drought-tolerant tobacco germplasm resources,24 imported tobacco varieties were taken as materials,and PEG-6000 was used to simulate drought stress to study the effects of drought treatment on tobacco seed germination and seedling growth. The results showed that,under drought stress,the germination traits of tobacco germplasm decreased to varying degrees.Among them,the effect on the germination rate and the whole seedling length was relatively small;the effect on the fresh weight of the seedling was relatively large. According to the membership function values of the stress coefficients of various indicators,the tested tobacco varieties were divided into four types,including drought-resistant,moderate drought-resistant,non-drought-resistant and drought-prone germplasm. A total of eleven drought-resistant germplasms,nine moderate drought-resistant germplasms,three nondrought-resistant germplasms,and one drought-prone variety were screened out.