通化市中低产田影响因素分析及改造措施

Preliminary Studies on the Factors Influencing the Sporulation of Chlamydospores of Ustilaginoidea Virens (Cke.) Tak. in Vitro

摘要:

本文依据第二次土壤普查结果,分析了通化市现有耕地的情况,研究了通化市气候特点、耕地质量、区域分布、土壤类型、土壤肥力及特点等因素对农业生产的影响,探讨了通化市改造中低产田的意义和利用途径,根据通化市‘“九五”农业生产规划提出了具体的农田改造利用措施。

Abstract:

Studies on the chlamydospores sporulation power of the rice false smutfungus were carried out under condition of different nutrient media, nutrition (C and Nsource ), pH value, incubation temperature, light and generations of the fungus. The resultsshow that PSA is the best medium for sporulating.The 2nd and the 3rd generations ofstrain are easy to form chlamydospores. NH₄CI and KNO₃, have certain purpose for chlamydospore formating. The optimal temperature for sporulation is 15～25 ℃, but sporulationneeds longer time at 15 ℃ and 20 ℃. The pH 5～7 is good and 6 is the best. Light can greatly affect the quantity and the time of chlamydospore formation. Alternate light and dark isthe best.