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Testing method of pre harvesting sprouting and genealogical pedigree of pre harvest sprouting resistant cultivars in wheat



Testing method of pre harvesting sprouting and genealogical pedigree of pre harvest sprouting resistant cultivars in wheat



Japanese Journal of Breeding 39(3): 365-372



Sprouting damage in wheat usually occurs at the ripening stage which coincides with the rainy season in Japan. The attempts to test great breeding lines for sprouting resistance have not been successful. The objectives of our studies were to develop effective testing methods for the selection of lines with pre-harvest sprouting resistance and analyze the genealogical pedigree of resistant cultivars in wheat. In the first part of the study, the sprouting percentage immediately after sampling was found to be high at 35 and 55 days after heading (DAH), and low at 45 DAH (near maturity) except for Saitama 27, while the sprouting percentage one month after sampling increased with the number of days after heading (Fig. 1). The sprouting percentage depending on the storage conditions among 19 cultivars increased in proportion to the storage temperature, namely, in the order of -16.degree.C < 0.degree.C < 16.degree. C < Room. The sprouting differences observed immediately after sampling were significantly correlated with the 0.degree.C (r = 0.691**), 16.degree.C (r = 0.489], room (r = 0.550*) storage conditions for 1 month and room storage conditions for 2 months (r = 0.628**), but were not correlated with the 0.degree.C and 16.degree.C for 2 months among 19 cultivars. The sprouting performance at different ripening stages under constant temperature testing conditions (17.degree.C) and alternating temperature testing conditions (25.degree.C in day time for 12 hrs. and 15.degree.C at night for 12 hrs.) were very similar but the sprouting percentage under the constant temperature testing conditions was higher than that under the alternating ones (Fig. 2). The sprouting differences among cultivars immediately after sampling were observed at 14 days after simulated rain treatment, while at 6 days after simulated rain treatment in stored spikes (Fig. 3). A significant correlation was observed between sprouting immediately after sampling and sprouting of spikes wrapped with wetted filter paper (filter paper wrapping method) under different testing temperatures (16.degree.C, 21.degree.C, 26.degree.C, 31.degree. C, 26.degree.C+16.degree.C). In the second part of the study, Shirodaruma, Toyohokomugi, Norin 61, and Zenkoujikomugi were found to be the most resistant cultivars. The resistant character to sprouting in Toyohokomugi and in Zenkoujikomugi was introduced from Akabozu and Igachikugo, respectively (Fig. 4). These results obtained suggeat that Toyohokomugi and Norin 62 can be used as parents with resistance to sprouting, and the filter paper wrapping method is applicable to the selection of resistant lines from the breeding lines at the F2, F3 and F4 generations because the number of breeding lines to be evaluated in early generations at harvest time is limited.

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Accession: 007868709

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