宁夏南部山区春小麦抗旱性鉴定研究

为了研究小麦品种的抗旱性与形态或生理指标的关系,通过室内模拟干旱条件,在种子萌发期和幼苗期,对来自宁夏的不同抗旱性小麦品种或品系分别对发芽率、胚芽鞘长度、主胚根长度、胚根数以及超氧化物歧化酶活性、脯氨酸含量等生理生化指标进行了分析。结果发现,在干旱胁迫条件下,抗旱强的品种(系)发芽率较高,胚芽鞘长度较长,叶绿素含量降低幅度较小,脯氨酸含量增加幅度较大,超氧化物歧化酶活性较强,主胚根长度、胚根数与抗旱性中等和抗旱性弱的有一定差别。将93-399等13个品种或品系进行了抗旱性的等级划分。划分为抗旱性强、中间型、抗旱性弱3个等级。

Studies on identification of drought-resistance of spring wheat in southern mountain area of Ninxia

Drought is one of the most important factors affecting spring wheat yield in Ningxia Hui Autonomous Region.This study investigated the association between wheat resistance to drought and morphological or physiological traits under the imitate drought condition in laboratory.The morphological or physiological traits,such as germinating capacity,coleoptile's length,root length,number of roots, superoxide dismutase and proline were analyzed on different drought resistant wheat cultivars or lines at the stage of germinating and seedling.The results indicated that in drought stress condition,the high drought-resistant cultivars or lines had higher germinating capacity,longer coleoptile's length,lower reduction in the chlorophyll,higher increase in the proline contents,and higher activation of superoxide dismutase,coleoptile's length and root's amount are different from mediate or feeble drought-resistant cultivars or lines.13 wheat cultivars were divided into three classes,high drought-resistance,mediate droughtresistance and feeble drought-resistance.These results could be helpful to wheat drought-resistance breeding.