盐碱胁迫对燕麦叶绿体超微结构及一些生理指标的影响

Effects of Saline-Alkali Stress on Ultrastructure in Chloroplast and Some Physiological Indexes of Oats

在人工控制条件下,研究了盐碱胁迫对燕麦叶绿体超微结构及一些生理指标的影响。结果表明:随着盐碱浓度的增加,燕麦叶绿体膨胀,基粒片层扭曲、变形、松散,基质稀薄,淀粉粒消失,嗜锇颗粒变为空腔,膜逐渐解体。但这种变化在品种间存在较大差异,耐盐碱品种“白燕7号”的超微结构受盐碱胁迫影响较小,不耐盐碱品种“白燕1号”受影响较严重。生理生化指标测定结果表明:随着盐碱浓度的增加,过氧化氢酶(CAT)活性下降,硝酸还原酶(NR)活性先上升后下降,丙二醛(MDA)含量上升,电解质渗出率增加。

Under controlled conditions, the effects of saline-alkali stress on ultrastmcture in chloroplast and on some physiological indexes of oats were studied. The results showed that with the increase of salt concentration, the chloroplast of oats expanded, the slices of basal granule were distorted or even disintegrated, matrix was tenuity, the starch particles d brane of chloroplast became disintegrated. These change isappeared, plastoglobulis became empty, and the memchanges varied greatly among different cultivars. The of ultrastructure was bigger in baiyan 1 than in baiyan 7 owing to its sensitivity to salt. With the increase of salt concentration, the activities of catalase （CAT） were digressive, the activities of nitrate reductase（NR） increased first and then decreased, the content malondialdehyde（MDA） increased, and the transudatory rate of electrolyte increased.