禾谷镰孢菌组蛋白去乙酰化酶基因(HDACs)功能验证
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摘要
由禾谷镰孢菌(F. graminearum)引起的小麦赤霉病是一类很重要的真菌病害。自2003年禾谷镰孢菌野生型菌株PH-1的全基因组序列公布以来,其功能基因组学研究取得了重要进展。因缺乏有效抗病基因以及抵抗初侵染或对其完全免疫的种质资源,目前,关于抗赤霉病的小麦或大麦商业化研究尚未见报道。基于体内同源重组原理的基因敲除技术在禾谷镰孢菌基因功能研究方面的遗传转化体系已经非常成熟,本研究通过构建组蛋白去乙酰化酶基因(HDACs)两个家族classI (HDF4)、classII (HDF1、HDF2、HDF3)的突变体,以及hdf1hdf2、hdf1hdf3两个双突变体,研究HDACs在禾谷镰刀菌(F. graminearum)的生长、致病过程中的分子生物学机制,为更好的防治该病害提供一定的理论基础。
     禾谷镰孢菌的基因组预测class I HDAC与酵母的PRD3同源,并且三个class II HDAC基因与酵母里的HOS2、HDA1、HOS3同源。在侵染小麦穗的致病性实验表明,HDF4和HDF1 (FGSG_01353)基因在致病侵染过程中起了重要作用。但是,突变体hdf4的营养生殖减慢了相当多,不产生气生菌丝,并且不产生分生孢子。而突变体hdf1只是轻微的降低了一些。在有性生殖杂交实验中,突变体hdf1是不育的,取代了有性生殖阶段的子囊壳,并且该突变体产生大量的分生孢子。在6小时的芽管里,突变体就产生了大量的油滴结构。并且,突变体hdf1接种小麦穗时,只在接种部位发病,并不扩展,而hdf4接种小麦穗完全不发病。实验结果表明,对HDF1的敲除,很有可能影响和调控了一些下游基因,这些基因包括有性生殖相关基因,产孢相关基因,油滴产生机制相关基因以及与致病相关。
Fusarium head blight (FHB), caused by Fusarium graminearum, is one of the most devastating fungal diseases in wheat. Functional genomics of F. graminearum has been significantly important since the wide-type PH-1 genome was sequenced in 2003. Shortage of effective resistance gene and sources for the prevention or immune of the fungus, no wheat cultivars resistant to WHB are commercialized. Gene knock out based on homologous recombination, along with the corresponding transformation system, has been widely used in functional genomic study of F. graminearum. In this study, we constructed the mutants of two histone deacetylase (HDAC) families class I (HDF4), class II (HDF1, HDF2, HDF3), and the double mutants hdf1hdf2 and hdf1hdf3 in F. graminearum. The molecular mechanism of HDACs genes in development and pathogenicity of F. graminearum was then studied, which will serve theoretical basis for control of the disease.
     The F. graminearum genome has one predicted class I HDAC gene that is homologous to yeast RPD3. It also contains three class II HDAC genes that are homologous to HOS2, HDA1, and HOS3 in S. cerevisiae. Mutants deleted for these four HDAC genes were generated with the split-marker approach. Infection assays with flowering wheat heads indicated that the HDF4 and HDF1 (FGSG_01353) genes are important for plant infection. While the hdf4 mutant was severely reduced in vegetative growth, the hdf1 mutant had relatively normal growth rate. The latter produced fewer conidia and shorter aerial hyphae. On mating plates, the hdf1 mutant was sterile. Instead of forming protoperithecia or perithecia, it produced abundant sporodochia with massive amount of macroconidia. In 16 h germlings, the mutant accumulated numerous lipid droplets. The hdf1 mutant was normal in the initial penetration but failed to spread to the rachis of flowering wheat heads. The hdf4 did not caused disease in wheat head. These data suggested that deletion of HDF1 likely affected proper regulation of subsets of genes involved in sexual reproduction, conidiation, lipid metabolism, and plant infection.
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