Effects of Day and Night Temperatures on Flower-bud Formation and Bolting of Japanese Bunching Onion(Allium fistulosum L.).
|
Accession number;00A0234049
|
| Title;Effects of Day and Night Temperatures on Flower-bud Formation and Bolting of Japanese Bunching Onion(Allium fistulosum L.). |
| Author;
YAMASAKI A
(National Res. Inst. Vegetables, Fukuoka)
TANAKA K
(National Res. Inst. Vegetables, Fukuoka)
YOSHIDA M
(National Res. Inst. Vegetables, Fukuoka)
MIURA H
(National Res. Inst. Vegetables, Fukuoka)
|
Journal Title;Journal of the Japanese Society for Horticultural Science
|
Journal Code:F0626A
|
ISSN:0013-7626
|
|
VOL.69;NO.1;PAGE.40-46(2000)
|
| Figure&Table&Reference;TBL.7, REF.15 |
| Pub. Country;Japan |
| Language;English |
| Abstract;Effects of day and night temperatures on flower-bud formation and bolting of Japanese bunching onion(Allium fistulosum L.) were investigated by using mid-season flowering 'Kincho' and 'Asagi-kujo', and late-season flowering 'Cho-etsu'. Exp.1. Plants were grown at 3,7,11, and 15.DEG.C. at night and 20.DEG.C. during the day for 20 to 60 days. Flower-bud formation was promoted at 3.DEG.C. and, especially, at 7.DEG.C. in all cultivars. More than 50% of 'Kincho' and 'Asagi-kujo' plants formed flower buds at 15.DEG.C. when grown for 60 days; only 10% of 'Cho-etsu' bloted. Exp.2 Plants were grown at 7.0,13.5,20.0 or 26.5.DEG.C. during the day and 7.0.DEG.C. at night. Bolting of 'Kincho' and 'Asagi-kujo' plants at 7.0.DEG.C. and 26.5.DEG.C. was slightly retarded, compared to plants exposed to 13.5.DEG.C. and 20.0.DEG.C.. The bolting rate of 'Cho-etsu' was lower in all day temperatures than were those of 'Kincho' and 'Asagi-kujo', irrespective of the duration of treatments. Over 60% of 'Cho-etsu' bolted when grown at 7.0.DEG.C. and 13.5.DEG.C. for 75 days, whereas only 33.3% bolted at 20.0.DEG.C.; no plants bolted at 26.5.DEG.C.. Thus, 'Cho-etsu' plants were devernalized at day temperature 20.0.DEG.C. and 26.5.DEG.C.. Based on these results, the optimum night temperature for flower-bud formation of Japanese bunching onions is 7.DEG.C. at 20.DEG.C. during the day. Devernalization occurs in 'Cho-etsu' at and above 20.DEG.C.; it rarely occurs in 'Kincho' and 'Asagi-kujo' below 26.5.DEG.C.. (author abst.) |
|
|
|
Related Articles;
|
|
|
