Field Test for Field Resistance of Rice Varieties with Different Genotypes for True Resistance to Blast

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  • いもち病真性抵抗性遺伝子型の異なるイネ品種の圃場抵抗性の本田における検定
  • イモチビョウ シンセイ テイコウセイ イデンシガタ ノ コトナル イネ ヒンシ

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Abstract

Twelve rice varieties with and without a blast resistance gene, Pi-z, were tested for their field resistance in a paddy field in Takayama, Gifu Prefecture. It was attempted to evaluate the field resistance by estimating infection rate on each variety. A negative correlation was obtained between the number of lesions per plant, y, and the infection rate, r, calculated by the equation, r=(lny2-lny1)/(t2-t1), where y2 and y1 were the number of lesions at times t2 and t1, respectively. Taking this fact into consideration, corrected equations were proposed to estimate the infection rate: r=[ln{y2/(Y-y2)}-ln{y1/(Y-y1)}]/(t2-t1), and Y=y1/x1, where x1 was the proportion of diseased leaf-area at t1, and t2-t1 was the incubation period.

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