淹水胁迫及胁迫解除对甜瓜光合色素和光合特性的影响

以耐涝性差异显著的两个甜瓜品系T106 和T241 为试验材料，采用双套盆法进行淹水胁迫，研究了淹水胁迫及胁迫解除对甜瓜幼苗光合色素和光合特性的影响。结果表明：随着淹水胁迫时间的延长，2 个甜瓜品系的叶绿素a、叶绿素b、总叶绿素、类胡萝卜素含量以及净光合速率、蒸腾速率、气孔导度、胞间CO₂ 浓度均呈下降趋势，且T106 各项指标的下降幅度均低于T241；在淹水胁迫相同天数时，T106 的各项指标均高于T241；在淹水胁迫解除后，2 个甜瓜品系的各项指标均上升，且T106 的上升幅度大于T241。

Effects of Flood Stress and Stress Relieve on Melon Photosynthetic Pigments and Photosynthesis Character

Taking 2 melon（Cucumis melo L.）lines T106 and T241 with significantly differences in flood-resistance as experimental materials，this paper analyzes the effects of flood stress and flood relieve on photosynthetic pigments and photosynthesis character of melon seedling．The results indicated that under extended time of flood stress， Chla，Chlb，Chl（a+b），Car，net photosynthetic rate，transpiration rate，stoma conductivity，inner cellular CO₂ concentration of these 2 melon lines all decreased．The decreasing extent of T106 was lower than that of T241. In the same flooded duration，the indexes of T106 were all higher than T241．When flood was relieved，the indexes of 2 melon lines all increased，and the increasing extent of T106 was larger than T241.