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- W2364449120 abstract "Chilling occurs frequently in recent years, and has become a major limiting factor for sugarcane production. Chloro-plasts are the main organelle for photosynthesis and one of the subcellular fractions for chilling sensitivity in plants. In order to investigate the effect of chilling stress on the physiological metabolism of sugarcane chloroplast, and reveal the relationships be-tween the physiological characteristics in chloroplast and chilling tolerance of sugarcane, the present experiment was conducted with two varieties of GT28 (chilling resistant) and ROC22 (chilling susceptible) with two treatments: control (28?C) and chilling stress (4?C). The relative electrical conductance (REC) of sugarcane seedling leaves, and chlorophyll fluorescence parameters and some physiological indices in chloroplasts were measured. The results showed that under the low temperature stress condition, the plasma membrane permeability of the seedling leaves, initial fluorescence (Fo) and NPQ increased significantly in both varieties, and the chilling resistant variety GT28 was more stable than the chilling sensitive variety ROC22; and the Fv/Fm, Fv'/Fm', qP, and ΦPSII decreased in the two sugarcane varieties, and decreased less in GT28 than in ROC22. The activities of Hill reaction, Mg2+-ATPase and Ca2+-ATPase in chloroplasts decreased, and those in GT28 decreased less than those in ROC22. The MDA content and SOD, POD, GR activities in the chloroplasts increased, and sugarcane variety GT28 showed lower increase in MDA but higher increase in SOD, POD, and GR activities. The chlorophyll fluorescence parameters and the physiological characteris-tics in the chloroplasts of sugarcane leaves were affected significantly by chilling stress. The changes of chlorophyll fluorescence and the physiological characteristics in the chloroplasts are correlated significantly to low temperature resistance, and GT28 is more chilling resistant than ROC22." @default.
- W2364449120 created "2016-06-24" @default.
- W2364449120 creator A5016609966 @default.
- W2364449120 date "2012-01-01" @default.
- W2364449120 modified "2023-09-23" @default.
- W2364449120 title "Effect of Chilling Stress on Physiological Metabolism in Chloroplasts of Seed-lings of Sugarcane Varieties with Different Chilling Resistance" @default.
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