作物学报 ›› 2014, Vol. 40 ›› Issue (11): 1946-1955.doi: 10.3724/SP.J.1006.2014.01946
赵晨晨1,黄福灯2,龚盼1,杨茜1,程方民1,潘刚1,*
ZHAO Chen-Chen1,HUANG Fu-Deng2,GONG Pan1,YANG Xi1,CHENG Fang-Min1,PAN Gang1,*
摘要:
叶片早衰直接影响作物的产量与品质, 因此, 研究叶片早衰的分子与生理机制对于作物遗传改良具有重要的意义。本研究利用60Co辐射诱变水稻品种93-11获得突变体osled, 其从分蘖期叶片就开始早衰, 最先表现为叶尖和叶边缘变褐, 并伴有红褐色斑点。在苗期经模拟干旱胁迫处理后, 突变体不仅早衰, 而且植株变矮以及根系变短。生理分析表明, 野生型剑叶、倒二叶和倒三叶的丙二醛(MDA)含量、超氧化物歧化酶(SOD)活性及过氧化物酶(POD)活性基本不变, 但突变体则显著升高且倒二叶和倒三叶极显著高于野生型; 突变体和野生型三片叶的可溶性蛋白含量、过氧化氢酶(CAT)活性及叶绿素总含量均依次下降, 但突变体倒二叶和倒三叶的含量或活性均显著低于野生型。叶片经台盼蓝、二氨基联苯胺(DAB)及四唑硝基蓝(NBT)等细胞组织化学染色及透射电镜分析表明, osled叶片细胞膜系统已破坏, H2O2和O2?积累, 叶绿体已开始解体。遗传分析表明, osled受一隐性基因控制, 借助图位克隆技术将该基因定位于第3染色体长臂的RM15528与RM15553两个标记之间, 遗传距离均为0.7 cM, 该结果为进一步克隆OsLED基因并研究其功能奠定了基础。
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