ATP硫酸化酶基因MoMET3在稻瘟病菌生长发育和致病过程中的功能分析
收稿日期: 2017-02-13
修回日期: 2017-05-23
网络出版日期: 2017-09-10
基金资助
国家自然科学基金资助项目(31170136);国家自然科学基金资助项目(31470249);浙江省公益技术研究农业项目(2013C32019)
Functional Analysis of MoMET3 in Growth, Development and Pathogenicity of Magnaporthe oryzae
Received date: 2017-02-13
Revised date: 2017-05-23
Online published: 2017-09-10
目的 真菌对硫元素的利用始于ATP硫酸化酶对硫酸根离子的活化。对稻瘟病菌ATP硫酸化酶在病菌生长发育和致病过程中的功能进行分析,可为稻瘟病的防治提供药物靶标。方法 采用同源重组方法构建基因敲除载体,并对突变体的表型进行分析。结果 MoMET3基因是病菌营养生长和分生孢子形成所必需的,但不是毒力因子。稻瘟病菌ATP硫酸化酶编码基因MoMET3缺失后,突变体营养生长速率减慢,产孢量降低,但是突变体对寄主的毒力不受影响;虽然基因缺失不影响突变体分生孢子萌发和附着胞成熟,但突变体在硫营养限制时孢子萌发后次生菌丝的生长明显受抑。MoMET3基因互补后,突变体恢复正常生长,能利用硫酸盐。结论 无机硫的还原对分生孢子的萌发和附着胞的成熟并不是必需的,分生孢子内储存的还原态硫化合物可以满足这一过程中硫营养的需求,但病菌侵入寄主组织后需要吸收利用寄主源还原态硫以利于侵染菌丝的扩展。
冯向阳, 张震, 柴荣耀, 邱海萍, 王教瑜, 毛雪琴, 王艳丽, 孙国昌 . ATP硫酸化酶基因MoMET3在稻瘟病菌生长发育和致病过程中的功能分析[J]. 中国水稻科学, 2017 , 31(5) : 542 -550 . DOI: 10.16819/j.1001-7216.2017.7018
【Objective】 Sulfur is generally made biologically available by activation with ATP in a reaction catalyzed by ATP sulfurylase in fungi. The function of ATP sulfurylase in the growth and pathogenecity of Magnaporthe oryzae was analyzed to lay a foundation for target determination for rice blast prevention.【Method】The knockout vector was constructed by homologous recombination method, and the phenotype of the mutant was analyzed.【Result】MoMET3 was required for vegetative growth and conidiation, but not a virulence factor. The growth rate and conidiation of MoMET3- deleted mutants were significantly decreased in complete medium. Loss of MoMET3 did not affect conidial germination and appressiorial formation, but the growth of secondary hyphae was inhibited in the minimal medium. After complementation of MoMET3 gene, the mutant returned to normal growth and can utilize sulfate. 【Conclusion】These evidences revealed that the reduction of inorganic sulfur is not necessary for the process of conidial germination and appressiorial formation. The endogenous reduced sulfur in conidia was sufficient to meet the sulfur needs in the process of conidial germination and appressiorial formation, and utilization of host-derived reduced sulfur played an important role in the hypha expansion of the blast fungus in hosts.
Key words： Magnaporthe oryzae; ATP sulfurylase; MoMET3; functional analysis
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