不同花生品种(系)萌发期抗旱性鉴定评价

以发芽势、发芽率、发芽指数、胚根长、胚轴长、幼芽长、幼苗鲜/干重的相对值为指标,通过PEG6000模拟干旱处理,对15份花生品种(系)进行萌发期抗旱性鉴定。结果显示,胁迫处理初期,低浓度处理对种子萌发有促进作用,随着胁迫处理时间的延长及胁迫处理浓度的升高,种子萌发受抑制程度增强。除相对幼芽长以外,其他相对指标都和品种综合抗旱能力呈极显著正相关。通过隶属函数法结合抗旱分级标准筛选出泰花4号、徐花13号、泰0125、泰0005等4份抗旱品种,泰花5号、濮花28、中花16等3份中抗材料,表明该方法可以作为一种快速、简便的鉴定花生萌发期抗旱性的方法。

Identification of drought tolerance in peanut varieties/lines at the germination stage

In this paper, drought tolerance at the germination stage of 15 peanut varieties (lines) was identified by PEG6000 treatment. The index took into account 8 indicators including relative germination energy, germination rate, germination index, radicle length, hypocotyl length, buds length and seedling fresh/dry weight. The results indicated that seed germination was promoted by low level of PEG6000 at early stage of stress treatment, but restrained with the extension of processing time and higher concentration. Except for the relative buds length, all other indicators were significantly positively correlated with the comprehensive drought tolerance of each variety. Based on subordination function method and the standard classification of tolerant ability in peanut, we screened 4 drought tolerant varieties (JS2, 6, 14, 15) and 3 mediate tolerant varieties (JS3, 11, 13), indicating the method as a quick and convenient technique in identification of drought tolerance of peanut germination.