枯萎病菌诱导感、抗陆地棉品种的转录因子表达变化

Expression Changes of Transcription Factors in Susceptible and Resistant Upland Cotton(Gossypium hirsutum L.) Cultivars in Response to Fusarium wilt

以陆地棉抗病品种中棉所12和感病品种新陆早7号为材料,利用Solexa高通量测序技术调查枯萎病菌诱导后不同时间感、抗陆地棉品种转录因子家族及转录因子的表达情况。结果表明,枯萎病菌诱导后,抗病品种中棉所12有39个转录因子家族的433个转录因子在至少一个比对组中表达活性发生变化;感病品种新陆早7号则有52个转录因子家族的588个转录因子在至少一个比对组中表达活性发生变化。新陆早7号对枯萎病菌响应的转录因子及转录因子家族的数目明显多于中棉所12,且2个品种的下调基因数目均多于上调基因。随着枯萎病菌诱导后时间延长,两品种对枯萎病菌诱导响应的转录因子家族及转录因子数量均呈现先增加后降低的变化趋势,中棉所12在枯萎病菌诱导后6 h达最多,而新陆早7号在诱导后3 h达最多。在6个比对组中,表达活性均发生变化的重叠转录因子,中棉所12中有9个,隶属于6个转录因子家族;新陆早7号中有31个,隶属于17个转录因子家族。不同抗病性品种对枯萎病的响应有较强的品种特异性,除37个共有的转录因子家族外,2个转录因子家族是中棉所12所特有,15个转录因子家族是新陆早7号所特有。

The Solexa sequencing technique was used to study the expression changes of transcription factors and their families in upland cotton cultivars susceptible and resistant to Fusarium wilt. A total of 39 transcription factor families and 433 transcription factors in Zhongmiansuo 12 and 52 transcription factor families and 588 transcription factors in Xinluzao 7 were changed in ex-pression in at least one comparison group induced by Fusarium wilt. The number of transcription factor families responsed to Fusarium wilt was more in Xinluzao 7 than in Zhongmiansuo 12, and the number of down-regulated genes was more than that of up-regulated genes in two varieties. After the induction by Fusarium wilt, in the process of time, the number of transcription factor families and transcription factors responsed to the Fusarium wilt in two cultivars showed the same changing trend of increase first and decrease then. The maximum number was reached after six hours in Zhongmiansuo 12, while at three hours after the inducing in Xinluzao 7. Among six comparison groups, there were nine overlapping transcription factors in six transcription factor families of Zhongmiansuo 12 and 31 overlapping transcription factors in 17 transcription factor families of Xinluzao 7. The expression of transcription factor showed strong cultivar specificity among varieties tolerant to Fusarium wilt. Except for 37 transcription factor families shared between two cultivars, two transcription factor families were unique to Zhongmiansuo 12 and Zhongmiansuo 15 transcription factor families were unique to Xinluzao 7.