作物学报 ›› 2014, Vol. 40 ›› Issue (07): 1157-1163.doi: 10.3724/SP.J.1006.2014.01157
吴立柱,王省芬,张艳,李喜焕,张桂寅,吴立强,李志坤,马峙英*
WU Li-Zhu,WANG Xing-Fen,ZHANG Yan,LI Xi-Huan,ZHANG Gui-Yin,WU Li-Qiang,LI Zhi-Kun,MA Zhi-Ying*
摘要:
以抗病海岛棉Pima 90-53、耐病陆地棉冀棉20和感病陆地棉邯208为材料,研究黄萎病菌胁迫下棉花细胞壁的组织结构和木质素含量与棉花抗性的关系,并分析参与木质素合成的胞外漆酶的基因表达水平。结果发现,室内接种黄萎病菌24 h,在Pima 90-53的根部导管组织中没有发现病原菌的侵入,而在冀棉20和邯208的导管组织均有病原菌侵入;接种35 d时,Pima 90-53的茎部导管细胞壁高度木质化且导管堵塞不明显,冀棉20的导管细胞壁中度木质化且导管堵塞不明显,而邯208的导管细胞壁仅发生轻度木质化且导管堵塞严重。对田间病圃种植棉花叶片和叶柄的测定发现,3个品种的酸不可溶性木质素含量与品种的病情指数呈显著负相关(r = 0.99991*),酸不可溶与可溶性木质素的比值大小与棉花品种黄萎病抗性强弱表现一致。基于此,进一步采用Real-time PCR技术分析参与木质素合成的漆酶基因GhLaccas表达差异发现,在冀棉20接种病菌后各检测时间点的表达量均显著高于邯208,且在冀棉20中GhLaccase表达量较0 h升高9~14倍,在8 h达到最高并在72 h内一直维持较高水平,表现出较高的应答效率。以上结果表明酸不可溶性木质素含量与黄萎病抗性呈正相关,漆酶在棉花抗黄萎病过程中起着重要作用。
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