Varietal Differences and Genetic Improvements of Bulb Qualities in Spring-sown Onion.
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Accession number;99A0922085
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| Title;Varietal Differences and Genetic Improvements of Bulb Qualities in Spring-sown Onion. |
| Author;
SATO YUTAKA
(Minist. of Agric., For. and Fish., Hokkaido Natl. Agric. Exp. Stn.)
NAGAI MAKOTO
(Minist. of Agric., For. and Fish., Hokkaido Natl. Agric. Exp. Stn.)
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Journal Title;Journal of the Japanese Society for Horticultural Science
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Journal Code:F0626A
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ISSN:0013-7626
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VOL.66;NO.2;PAGE.339-345(1997)
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| Figure&Table&Reference;FIG.3, TBL.6, REF.12 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;Bulbs of spring-sown onion cultivars are generally very firm and pungent. In this study, we attempted to improve bulb qualities, such as pungency, bulb firmness, and scale thickness without decreasing storability. 1. On the basis of sensory tests, pungency was found to be highly correlated with the amount of enzymatically formed pyruvic acid(EFPA) so that EFPA can be used as a reliable index of pungency. The EFPA is higher and the bulb firmer in spring-sown varieties than are those of autumn-sown ones; the scale thickness in the spring-sown varieties is thinner than that in the autumn-sown varieties. The percentage of healthy bulbs after four months of storage in spring-sown varieties was much higher than that in autumn-sown varieties. A significant correlation exists between pungency, bulb firmness, scale thickness, and long storage life. These correlations make it difficult to produce new F1 varieties having both good bulb qualities and long storability. 2. To improve the bulb qualities in spring-sown onion, pollen parent genotypes were selected from the autumn-sown variety 'Chyosei'. Pedigree line 'CS-3' developed from 'Chyosei', inbred for two generations, was promising as a pollen parent. 'CS-3' was then crossed with the cytoplasmic male sterile(CMS) line '2935A'. The resulting F1 plants have improved bulb qualities and long storability. (author abst.) |
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