Mutants deficient in nitrate reductase(NR) were classfied into two groups,nia types are deficient in apoprotein and cnx types are lack of Mo-Co.This paper reports the characteristics of low NR mutants,which are not de...Mutants deficient in nitrate reductase(NR) were classfied into two groups,nia types are deficient in apoprotein and cnx types are lack of Mo-Co.This paper reports the characteristics of low NR mutants,which are not deficient in NR activity but 40%～60% of the NR activity of the wild type,Nipponbare.Mutants NR676 and NR827 were selected as seedings showing poor growth with nitrate as sole mitrogen source from M 2 population.They exhibited chlorate resistance.Genetic analysis in the F 1 and F 2 indicated that chlorate resistance in the mutants was transmitted by a single recessive nuclear gene and that NR676 and NR827 were induced by a mutation at a single locus.In the F2 population,all of the seedings showing yellow green leaves were resistant to chlorate and low in NR activity.Photosynthetic rate and mRNA expression of NR676 and NR827 were lower than wild type.These results suggested that low NR activity and chlorate resistance of NR676 and NR827 were caused by a defect in photosynthetic process.展开更多
Eleven nitrate non-utilizing (nit) mutants were recovered from six isolates of Magnaporthe grisea cultured on MM media -amended with 60 g/L potassium chlorate, with a frequency of 1.42 %. Some biological properties, s...Eleven nitrate non-utilizing (nit) mutants were recovered from six isolates of Magnaporthe grisea cultured on MM media -amended with 60 g/L potassium chlorate, with a frequency of 1.42 %. Some biological properties, such as growth rate, growth biomass, cultural characters, conidial production, sexual reproduction ability, and pathogenicity were compared between nit mutants and their parent isolates. Results showed that all the nit mutants were resistant to chlorate. Some important biological properties such as the growth rate on YPSA, conidial production ability on TPSA, pathogenicity, had no significant differences between nit mutants and their parent isolates. Mating type didn't change, but perithecia production ability of fertile isolates changed significantly as compared with that of their parent isolates. Therefore, the nit can be used as a genetic marker to study the genetics such as pathogenicity, fungicide resistance in Magnaporthe grisea.展开更多
利用氯酸钾毒性,诱变棉花枯萎病菌产生硝酸盐利用缺陷型突变体(nit)。在485个 nit 突变体中,生理表现型以 nit A 为最多,nit B 和 nit C 次之,nit D 极少。不同生理表现型之间的互补关系复杂。对107个菌株的突变体间进行营养体亲和性测...利用氯酸钾毒性,诱变棉花枯萎病菌产生硝酸盐利用缺陷型突变体(nit)。在485个 nit 突变体中,生理表现型以 nit A 为最多,nit B 和 nit C 次之,nit D 极少。不同生理表现型之间的互补关系复杂。对107个菌株的突变体间进行营养体亲和性测定的结果表明,95个菌株属于同一个营养体亲和群 VCG_1,6个菌株属于VCG_2,另有2个菌株为单菌株亲和群。展开更多
文摘Mutants deficient in nitrate reductase(NR) were classfied into two groups,nia types are deficient in apoprotein and cnx types are lack of Mo-Co.This paper reports the characteristics of low NR mutants,which are not deficient in NR activity but 40%～60% of the NR activity of the wild type,Nipponbare.Mutants NR676 and NR827 were selected as seedings showing poor growth with nitrate as sole mitrogen source from M 2 population.They exhibited chlorate resistance.Genetic analysis in the F 1 and F 2 indicated that chlorate resistance in the mutants was transmitted by a single recessive nuclear gene and that NR676 and NR827 were induced by a mutation at a single locus.In the F2 population,all of the seedings showing yellow green leaves were resistant to chlorate and low in NR activity.Photosynthetic rate and mRNA expression of NR676 and NR827 were lower than wild type.These results suggested that low NR activity and chlorate resistance of NR676 and NR827 were caused by a defect in photosynthetic process.
文摘Eleven nitrate non-utilizing (nit) mutants were recovered from six isolates of Magnaporthe grisea cultured on MM media -amended with 60 g/L potassium chlorate, with a frequency of 1.42 %. Some biological properties, such as growth rate, growth biomass, cultural characters, conidial production, sexual reproduction ability, and pathogenicity were compared between nit mutants and their parent isolates. Results showed that all the nit mutants were resistant to chlorate. Some important biological properties such as the growth rate on YPSA, conidial production ability on TPSA, pathogenicity, had no significant differences between nit mutants and their parent isolates. Mating type didn't change, but perithecia production ability of fertile isolates changed significantly as compared with that of their parent isolates. Therefore, the nit can be used as a genetic marker to study the genetics such as pathogenicity, fungicide resistance in Magnaporthe grisea.
文摘利用氯酸钾毒性,诱变棉花枯萎病菌产生硝酸盐利用缺陷型突变体(nit)。在485个 nit 突变体中,生理表现型以 nit A 为最多,nit B 和 nit C 次之,nit D 极少。不同生理表现型之间的互补关系复杂。对107个菌株的突变体间进行营养体亲和性测定的结果表明,95个菌株属于同一个营养体亲和群 VCG_1,6个菌株属于VCG_2,另有2个菌株为单菌株亲和群。
