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对我国高粱上发生的一种新病害──高粱靶斑病进行了初步的研究。结果表明:(1)引起靶斑病的病原菌为蜀黍生离蠕孢菌 [Bipolaris sorghicoa (Lefebvre & Shetwin) Shoem];(2)病菌菌丝生长的适宜温度为25~30℃,分生孢子萌发的适宜温度为20~30℃;分生孢子萌发的适宜pH为3~6;(3)该菌能利用多种碳源作为营养,以木糖、半乳糖、菊糖为佳,其次为蔗糖、麦芽糖等;利于病菌生长的培养基为玉米粉、燕麦片和白高粱煎汁培养基;(4)田间土壤表面残落的和堆积在村屯附近的高粱秸垛表面的病残叶上的病菌,是翌年田间病害发生的主要初侵染来源;(5)所鉴定的 620份高粱不同品种资源中,对靶斑病的感病性存在明显差异,其中26份为免疫和高抗资源。
A new disease occurred on sorghum in China ─ ─ target spot disease of sorghum for a preliminary study. The results showed that: (1) the pathogen causing the target leaf spot was Bipolaris sorghicoa (Lefebvre & Shetwin) Shoem; (2) the optimum temperature for mycelial growth was 25-30 ℃ and the conidial germination The suitable temperature for conidiospore germination is 3 ~ 6. (3) The bacteria can utilize a variety of carbon sources as nutrients, and xylose, galactose and inulin are the best, followed by sucrose , Maltose, etc .; conducive to the growth of bacteria in the medium of corn flour, oatmeal and white sorghum fry juice medium; (4) field soil surface and the accumulation of sorghum in the village near the surface of the sick leaves (5) Among the 620 sorghum germplasm resources identified, there were significant differences in the susceptibility to target leaf spot, of which 26 were immunized and highly resistant to resources.