水分胁迫对柑橘果皮细胞壁结构与代谢的影响

研究水分胁迫下,盆栽'暗柳橙(Citrus Sinensis Osbeck cv. Anliu)'的果实成熟期果皮细胞壁超微结构、细胞壁物质成分、细胞壁代谢相关酶活性的变化规律及其之间关系.结果表明,在果实发育成熟期,果皮细胞壁代谢相关水解酶果胶酶、纤维素酶、果胶甲酯酶的活性随着水分胁迫的加强而增加,多酚氧化酶活性与果胶酶活性变化趋势相反,果皮细胞壁代谢相关成分离子结合型果胶、共价结合型果胶、半纤维素、纤维素的含量随着水分胁迫的加强而降低,水溶性果胶含量随着水分胁迫的加强而增加,果皮细胞壁超微结构随着水分胁迫的加强而加速解体.

Effect of soil moisture on cell-wall metalbolism of pericarp in citrus

Based on the potted sweet orange 'An liu(Citrus Sinensis Osbeck cv.Anliu)',we did some researches of ultrastructural changes in the mesocarp cell wall.Cell wall composition,and related enzymes in cell wall metabolism were done during ripening phase in under water stress condition.Results showed that the activities of polygalacturonase(PG),cellulose(CX) and pectinesterase(PME) were more increased,water stress was more severe in potted plant,and the changes of polyphenoloxidase(PPO) activities was on the contrary.The weights of ionically associated pectin,covalently bound pectin,hemicellulose and cellulose about the composition cell wall was induced with more severe water stress.In addition,the decomposion of ultrastructure in the mesocarp cell wall was accelerated by the more severe water stress.