Factors of influence on conidium germination and appressorium formation of Setosphaeria turcica,such as light condition,conidial concentration,nutrient resources and pH value of conidial suspension were studied.There ...Factors of influence on conidium germination and appressorium formation of Setosphaeria turcica,such as light condition,conidial concentration,nutrient resources and pH value of conidial suspension were studied.There was no significant difference among light treatments.The optimal pH for conidium germination and appressorium formation was 5.0 to 7.0.The exogenous nutrient sources were not the indispensable factors for conidium germination,but 5% sugar solution were more favorable for appressorium formation than the others.Low conidial concentration in suspension(conidia ≤104/mL)was propitious to conidium germination and appressorium formation,which were inhibited significantly in higher concentration.It was suggested that the phenomenon was due to the self-inhibitor,a kind of lipophilic substance,existing in the site of conidium germination.展开更多
由Exserohilum turcicum(Pass.)Leonard et Suggs[有性阶段是Septosphaeria turcica(Luttrell)Leonard et Suggs]引起的玉米大斑病是世界各地春玉米上发生较严重的一种叶枯性病害。它主要分布于较冷凉的亚洲北部、北美、南美、北欧和南...由Exserohilum turcicum(Pass.)Leonard et Suggs[有性阶段是Septosphaeria turcica(Luttrell)Leonard et Suggs]引起的玉米大斑病是世界各地春玉米上发生较严重的一种叶枯性病害。它主要分布于较冷凉的亚洲北部、北美、南美、北欧和南非等地,尤以多雨和多露年份常引起病害流行,造成严重减产。美国在1939—1943年和1951—1952年与1961年期间大斑病曾多次流行,除气象条件适宜病害流行外,主要因当耐推广的杂交种都是高感大斑病的。展开更多
China is a big agricultural country. If she can raise the yield of grain through aviation, it would be of great significance to her national economy. This kind of researches developed by the writer of this article has...China is a big agricultural country. If she can raise the yield of grain through aviation, it would be of great significance to her national economy. This kind of researches developed by the writer of this article has already gained much economic benefits, with its value popularizing to the whole country. The departments of general aviation are worthwhile to use for reference in the practical work.展开更多
文摘Factors of influence on conidium germination and appressorium formation of Setosphaeria turcica,such as light condition,conidial concentration,nutrient resources and pH value of conidial suspension were studied.There was no significant difference among light treatments.The optimal pH for conidium germination and appressorium formation was 5.0 to 7.0.The exogenous nutrient sources were not the indispensable factors for conidium germination,but 5% sugar solution were more favorable for appressorium formation than the others.Low conidial concentration in suspension(conidia ≤104/mL)was propitious to conidium germination and appressorium formation,which were inhibited significantly in higher concentration.It was suggested that the phenomenon was due to the self-inhibitor,a kind of lipophilic substance,existing in the site of conidium germination.
文摘由Exserohilum turcicum(Pass.)Leonard et Suggs[有性阶段是Septosphaeria turcica(Luttrell)Leonard et Suggs]引起的玉米大斑病是世界各地春玉米上发生较严重的一种叶枯性病害。它主要分布于较冷凉的亚洲北部、北美、南美、北欧和南非等地,尤以多雨和多露年份常引起病害流行,造成严重减产。美国在1939—1943年和1951—1952年与1961年期间大斑病曾多次流行,除气象条件适宜病害流行外,主要因当耐推广的杂交种都是高感大斑病的。
文摘China is a big agricultural country. If she can raise the yield of grain through aviation, it would be of great significance to her national economy. This kind of researches developed by the writer of this article has already gained much economic benefits, with its value popularizing to the whole country. The departments of general aviation are worthwhile to use for reference in the practical work.
