Response Mechanism of Rice Mutant pe-1 to Low Light Stress
This study utilized the γ-ray-induced early-maturation,fresh-green mutant line pe-1 from indica rice as an experimental material.At the trilobal stage and the tillering stage,we observed differences in morphological characteris-tics between pe-1 and wild type.In addition,we measured the activity of antioxidant-related enzymes and their regulatory genes expression,chlorophyll content and chloroplast synthesis and degradation-related gene expression,and photo-morphogenesis-related gene expression to detect the differences in the low light response between the pe-1 and wild type.The results showed that pe-1 exhibited less leaf yellowing,taller stature,and larger leaf area compared to wild type post-stress.The changes in chlorophyll content differed between leaves at the trilobal stage and the tillering stage.Addi-tionally,pe-1 resulted in increased chlorophyll content and elevated levels of the stress-responsive enzymes catalase and peroxidase,as well as increased expression of related genes.This indicates enhanced reactive oxygen species sca-venging and stronger adaptability to adverse conditions under low light conditions.Moreover,pe-1 exhibited increased expression levels of genes associated with photomorphogenesis,indicating superior light perception ability under low light intensities.In summary,the pe-1 mutant shows immense potential for survival under low light stress,contributing to the breeding rice with low light tolerance.
ricepe-1low light stressphotomorphogenesischlorophyllchloroplast synthesis and degradation
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