Varietal Difference of Resistance to Sheath Blight (Rhizoctonia solani Kuhn) in Sorghum

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  • ソルガム紋枯病抵抗性の品種間差異

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Abstract

To search for genetic resources of resistance to sorghum sheath blight, we examined the varietal difference of the resistance by a field inoculation test. The materials used were 72 varieties and lines, which were classified into grain, dual purpose (F_1) and sorgo types, including the Indian-type varieties selected for grain yield from grain type, Korean varieties and male-sterile lines. Field inoculation tests were carried out in 1984 and 1985. Barley grains were inoculated with anastomosis group 1 (AG-1), which was the most pathogenic to sorghum, and the grains were spread on the hill and covered with soil two months after the seeding of the test plants. Resistance to the disease was evaluated by the relative lesion height (RLH), which is the ratio of the height of lesion on the sheath (HL) to the height of flag leaf collar at maturity (HF). The varietal differences of HL, HF and RLH were similar in both years, and the coefficients between the values obtained in the two years showed a significant correlation (p<0.001). HL showing the degree of invasion and RLH showing the damage of plants closely correlated with each other, and the relationship in each of the three groups, grain type including male sterile lines, dual-purpose type including Korean type and sorgo type including Indian type, was regressed to a linear equation. The correlation between HF and RLH in each of the same three groups was also regressed to a linear equation (p<0.001). A wide variation in RLH was detected among the varieties of grain type with the same plant height. The higher resistant resources were found in every type, and a common criterion of the resistance was considered to be an RLH of less than 20% and HL of less than 20 cm.

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