水稲中間母本農5号のツマグロヨコバイおよび萎縮病に対する抵抗性の遺伝

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  • Inheritance of resistance to the green rice leafhopper Nephotettix cincticeps UHLER and dwarf disease in Rice Norin-PL 5.
  • スイトウ チュウカン ボホン ノウ 5ゴウ ノ ツマグロヨコバイ オヨビ イシ

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Rice Norin-PL 5 (PL 5) was developed as a Japonica type parental line resistant to dwarf, a rice virus disease. The inheritance of resistance of PL 5 to dwarf and to the green rice leafhopper (GLH), Nephotettix cincticeps, which is the vector of rice dwarf virus, and the relationship between dwarf resistance and GLH resistance were investigated in the present study. GLH resistance was analyzed using F1 and F2 populations of the crosses between PL 5 and. susceptible varieties by two methods i. e. the flag leaf test and the seedling test. In the flag leaf test, the number of survivals in the 10 young instar nymphs caged with one piece of flag leaf in a test tube was counted after four days. Segregation of the F2 populations fitted the ratio of 9 resistant : 7 susceptible (Table 1). The F1 individuals were as resistant as PL 5. These data indicate that the GLH resistance of PL 5 is controlled by two dominant complementary genes. In the seedling test, one seedling at the second leaf stage was caged with five young instar nymphs in a test tube and the number of survivals was examined after three days. The same result as in the flag leaf test was obtained from the F2 population of the cross PL 5/Saikai 160 (Table 2).

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