水分胁迫对小麦新品系叶绿素含量的影响

Effects of Water Stress on Chlorophyll Contents of New Wheat Lines

叶绿素含量是反映植物抗旱性的重要指标之一。为了研究小麦新品系的抗旱性,选育抗旱性较强的小麦新品系,本研究选用6个小麦新品系,以甘春20号为对照,在透明防雨棚中进行盆栽防雨控水试验,通过控制浇水,研究水分胁迫对小麦新品系叶绿素含量及抗旱性的影响。结果表明,花期干旱处理的叶绿素含量均高于苗期干旱处理。在不同干旱处理进程中,随着处理时间的延长,苗期干旱的叶绿素含量均显著下降,而在花期干旱中,花期干旱前期,叶绿素含量有所上升,但随着干旱处理时间的延长以及小麦的逐渐成熟,叶绿素含量显著下降。在不同品种(系)间,无论是干旱处理还是花期干旱处理,品系2010-1,2010-4和甘春20号的叶绿素含量最高,品系2010-8和2010-10次之,而品系2010-12和2010-22的叶绿素含量最低。叶绿素b含量在不同品系间无显著差异。由于叶绿素含量的高低可以反映不同小麦品种(系)对水分胁迫的敏感程度,因此,品系2010-1,2010-4和甘春20号抗旱性较强,品系2010-8和2010-10的抗旱性一般,而品系2010-12,2010-22的抗旱性比较差。

Chlorophyll content is an important indicator to reflect drought resistance in plant.In order to study the drought resistance of wheat and select the strong drought resistant wheat used in agricultural production,six wheat lines and Ganchun No.20 （CK） were selected and planted in pot,placed in canopy,by controlling the watering to research effects of water stress on chlorophyll content and ratio of wheat lines.The results indicated that chlorophyll content in blossom period drought were higher than that of in seedling stage drought.In the different drought processing,chlorophyll content decreased in seedling stage drought,with the prolongation of treatment time,but increased in earlier blossom period drought and then decreased,with the prolongation of treatment time and wheat maturing.In different varieties （lines）,both seedling stage drought and blossom period drought,chlorophyll content of 2010-1,2010-4 and Ganchun No.20 were the highest,that of 2010-8 and 2010-10 were the second,and that of 2010-12 and 2010-22 were the lowest.The chlorophyll b had no significant difference among different varieties （lines）.Chlorophyll content can reflect the water stress sensitivity in different wheat varieties （lines）,therefore,2010-1,2010-4 and Ganchun 20 had strong drought resistance,2010-8 and 2010-10 had middle drought resistance,but 2010-12 and 2010-22 had poor drought resistance.