| II. Genetic Stock Necrosis genes in Chinese and Indian common wheat K. TSUNEWAKI, Y. NAKAI, F. KASAHARA and T. FUJITA Laboratory of Genetics, Faculty of Agriculture, Kyoto University, Kyoto and Jiyu-gakuen, Kurume, Tokyo, Japan Since 1965, we are investigating distribution of necrosis genes in various geographical populations of wheat. This time we completed analysis of about 200 common wheat cultivars (or strains) from China and about 60 cultivars from India. Chinese materials were obtained from the Central Agricultural Experiment Station, Konosu, Japan. Information about their origin was also supplied. Indian materials were provided by the Indian Agricultural Research Institute, New Delhi, India. All those cultivars were crossed to three necrosis testers, Jones Fife (genotype ne1Ne2ch1Ch2), Prelude (Ne1ne2ch1Ch2) and Macha (Ne1ne2Ch1ch2). F1 hybrids obtained were grown in field, and occurrence of necrosis or chlorosis was observed. Based on this record, genotype for necrosis type 1 (caused by two complementary genes Ne1 and Ne2) and chlorosis type 1 (caused by Ch1 and Ch2) of the tested cultivars was determined. At the same time, three other characters, i.e. growth habit, awnedness and glume hairiness were observed. Growth habit was tested in greenhouse conditioned at 18-20C with 14-16 hr illumination. Depending upon their heading response, they were classified as spring (S), winter (W) and intermediate (I) types. For awnedness, all materials were classified to four types, fully awned (+ +), half awned (+), awnletted (+ or -) and awnless (-). Glume hairiness was expressed by either+(hairy) or-(glabrous). Results are summarized in the following table. Detailed treatment of the results with Chinese wheat was already published in Japan. J. Genet. 46: 103-107, 1971. (Received July 20, 1971) |
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