成熟期蔗叶离区细胞结构特点及PG含量变化分析  

Analysis of Cell Structure Characteristics and Polygalacturonase Content Changes in Sugarcane Leaves Abscission Zone at Maturity Stage

作　　者：欧克纬[1] 卢业飞[1] 农泽梅 朱鹏锦[1] 庞新华[1] 宋奇琦 吕平[1] Ou Kewei;Lu Yefei;Nong Zemei;Zhu Pengjin;Pang Xinhua;Song Qiqi;LüPing(Guangxi Subtropical Crops Research Institute,Nanning 530001,Guangxi,China)

机构地区：[1]广西壮族自治区亚热带作物研究所,广西南宁530001

出　　处：《作物杂志》2025年第1期133-138,共6页Crops

基　　金：广西自然科学基金(2023GXNSFAA026327);广西农科院科技发展基金项目(桂农科2022JM93);广西农业科学院基本科研业务专项项目(桂农科2023YM10);广西科技计划项目(桂科AA22117002-6);广西科技计划项目(桂科AA22117002-7)。

摘　　要：为筛选脱叶性强的甘蔗优良品种(系),以脱叶性存在差异的3个甘蔗品种(系)的不同叶位叶片为材料,观察蔗叶离区细胞的结构,并测定蔗叶、叶鞘中部、叶鞘基部的多聚半乳糖醛酸酶(PG)含量。结果表明,易脱叶甘蔗的离区组织细胞分解程度最高;3个成熟时期易脱叶甘蔗的+5叶鞘基部、+8叶鞘基部的PG含量均显著高于难脱叶甘蔗。甘蔗成熟早期+8叶鞘基部的PG含量与对应叶位离区细胞的裂解程度呈正相关;灰色关联度分析结果显示,+8叶片、+5叶鞘中部以及+8叶鞘基部中PG的含量与蔗叶的自然脱叶率关联度较大,结合各个时期PG含量,测定成熟早期+8叶鞘基部的PG含量可为筛选脱叶性状优良的甘蔗品种提供参考。In order to screen excellent sugarcane varieties with strong defoliation,the leaves at different positions of three sugarcane varieties(lines)with different defoliation were used as materials to observe the structure of detached cells of sugarcane leaves and determine the polygalacturoncase(PG)content in sugarcane leaves,middle leaf sheath and basal leaf sheath.The results showed that the decomposition degree of leaf sheath abscission tissue cells was the highest in easily defoliated sugarcane.The PG content in the basal part of+5 leaf sheath and+8 leaf sheath of easy-defoliation sugarcane were significantly higher than that of hard-defoliation sugarcane at three different mature stages.The PG content in the basal part of+8 leaf sheath at the early maturity stage of sugarcane was positively correlated with the cleavage degree of the cells in the corresponding leaf abscission zone.The results of grey correlation analysis showed that the content of PG in the+8 leaf,the middle of the+5 leaf sheath and the base of the+8 leaf sheath had a great correlation with the natural defoliation rate of sugarcane leaves.Combined with the measured PG content in each period,the PG content in the base of the+8 leaf sheath at the early maturity can provide reference for screening of sugarcane varieties with good defoliation traits.

关 键 词：甘蔗 脱叶率 离区 多聚半乳糖醛酸酶 

分 类 号：S566.1[农业科学—作物学]