Variation of the characters related to seed production in local turnip [Brassica rapa] cultivar, 'Outaki', in Nagano [Japan] Prefecture
2010
Kubota, S., Shinshu Univ., Minamiminowa, Nagano (Japan). Faculty of Agriculture | Ohi, M.
'Outaki' is the local cultivar of turnip in Nagano prefecture, and the seed is produced by farmers in more than 50 farm households now. It is a very rare local cultivar of turnip in Japan. In this experiment, we used 53 lines collected from farmers. We investigated the characteristics related to seed production: the low temperature sensitivity required for flowering, the level of self-incompatibility. In low sensitivity study, we treat each line with green and seed vernalization and then examined the rate of apical inflorescence and days to flowering blooms on each line. The level of self-incompatibility was evaluated by the percentage of pod per an inflorescence and the number of seeds per pod. The difference of low temperature sensitivity and the level of self-incompatibility were recognized between lines within this cultivar. However, these characters had no correlation with not only morphological characters but also the residential areas of each seed producer. The artificial selection by these two characters may be difficult, but in this cultivar, there was variation among the lines. It was suggested that seed production by each grower would preserved the variation of these characters.
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