【摘 要】
:
番茄白粉病是一种真菌病害,能够造成番茄的减产和品质下降.研究者在野生番茄中发现了6 个单基因抗性基因(Ol)和3 个QTL.前期的番茄和白粉菌互作的研究中,采用cDNA-AFLP 的方法分析得到887 个差异表达片段,其中230 个DE-TDF 被测序,通过电子作图确定了抗病基因的候选序列.本文利用VIGS 方法,采用TRV2-LIC 载体,对抗病基因/QTL 的候选序列进行功能分析,以确定抗性反
【机 构】
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商丘师范学院,植物与微生物互作河南省高校重点实验室 周口师范学院,植物遗传与分子育种重点实验室
论文部分内容阅读
番茄白粉病是一种真菌病害,能够造成番茄的减产和品质下降.研究者在野生番茄中发现了6 个单基因抗性基因(Ol)和3 个QTL.前期的番茄和白粉菌互作的研究中,采用cDNA-AFLP 的方法分析得到887 个差异表达片段,其中230 个DE-TDF 被测序,通过电子作图确定了抗病基因的候选序列.本文利用VIGS 方法,采用TRV2-LIC 载体,对抗病基因/QTL 的候选序列进行功能分析,以确定抗性反应的关键基因.通过对高抗白粉病番茄植株Solanum.habrochaitesG1.1560(携带Ol-1 基因)进行候选基因的沉默,观察到不同程度的抗性丧失的表型,确定了四个抗性反应必需基因,分别命名为ShORR-1、ShGSTU1、ShMADSTF、ShME1,采用BLAST 等生物信息学方法对抗病关键基因的功能进行分析,初步推测出番茄白粉病抗性反应机理;采用DAB 和台盼兰染色的方法对沉默植株G1.1560 进行了显微形态及活性氧积累的分析,指出沉默植株受到白粉菌侵染的表皮细胞中,表现出慢性HR,暗含了慢性HR 和H2O2 累积不能阻止O.neolycopersici 的生长,白粉菌能够完成生长周期并产生分生孢子.
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