不同基因型甘蔗耐低钾能力、光合特性和抗氧化酶系统的差异  

Differences in low-K tolerance,photosynthetic characteristics and antioxidant enzyme system between different sugarcane genotypes

作　　者：周文灵[1] 卢颖林[1] 敖俊华[1] 陈迪文[1] 黄莹[1] 黄振瑞[1] 李奇伟[1] 江永[1] 

机构地区：[1]广州甘蔗糖业研究所/广东省甘蔗改良与生物炼制重点实验室,广东广州510316

出　　处：《广东农业科学》2015年第24期41-46,共6页Guangdong Agricultural Sciences

基　　金：国家现代农业(甘蔗)产业技术体系(CARS-20-3-2);广东省现代甘蔗种业创新能力建设项目(粤科规财字[2014]208号);广东省现代农业科技创新;推广与信息化建设专项--现代种业提升工程资金计划项目(粤农计[2015]6号)

摘　　要：以粤糖60号(YT60)和斑茅杂交后代BC2-32为材料,采用营养液培养研究其耐低钾能力、光合特性、叶绿素荧光参数及抗氧化指标的差异。结果表明,与正常钾水平相比,低钾胁迫下,BC2-32的干物重下降了59.39%,而YT60的干物质量只下降了30.61%,下降幅度明显小于BC2-32,表现出较强的耐低钾能力;YT60叶片叶绿素含量、净光合速率(Pn)和最大光化学效率(Fv/Fm)的下降幅度均比BC2-32小,而且超氧化物歧化酶(SOD)活性、脯氨酸和丙二醛(MDA)含量的升高幅度也较小,表明光合特性以及抗氧化酶系统相关指标可以作为伸长前期筛选耐低钾基因型甘蔗的指标。A hydroponic experiment was conducted to investigate the differences of low-K tolerance ability,photosynthetic characteristics,chlorophyll fluorescence parameters and antioxidant indexes between Yuetang 60（YT60）and BC2-32,a progeny of Erianthus arundinaceus. The results showed that there was decline with 59.39% in dry weight of BC2-32 under low K stress,while only 30.61% for YT60,indicating that YT60 was more tolerant to low K stress than BC2-32. Under low K stress,the decline of leaf chlorophyll content,net photosynthetic rate（Pn）and maximum photochemical efficiency（Fv/Fm）was less and the increase of SOD activity,proline and malondialdehyde（MDA）content was also less for YT60 compared to BC2-32,which demonstrated that the photosynthetic characteristics and related indexes of the antioxidant enzyme system could be used as the indicators for screening sugarcane genotype with low K tolerance.

关 键 词：甘蔗 耐低钾 光合特性 抗氧化指标 

分 类 号：S566.1[农业科学—作物学]