FLOWERING AND SEED PRODUCTION IN OVERWINTERED CULTIVARS OF BULB ONIONS .2. QUANTITATIVE RELATIONSHIPS BETWEEN MEAN TEMPERATURES AND DAYLENGTHS AND THE RATE OF INFLORESCENCE DEVELOPMENT

被引:9
作者
BREWSTER, JL
机构
关键词
D O I
10.1080/00221589.1982.11515029
中图分类号
S6 [园艺];
学科分类号
0902 ;
摘要
The relationships between the rate of development of onion inflorescences and mean temperatures and mean day lengths were investigated using regression techniques. For ''Senshyu Semi-globe Yellow'' grown in 2 successive years in glasshouses kept at different temperatures, a linear regression on mean temperature accounted for all but 18.2% of the variance in the time needed for development between inflorescence appearance and seed ripening. Differences between ''Extra Early Kaizuka'', ''Senshyu Semi-globe Yellow'' and ''Hiberna'' in this relation were small. About 900 day-degrees above 10.degree. C were required between inflorescence appearance and seed ripening. Base temperatures other than 10.degree. C were tested and a base of 2.degree. C gave the smallest variance in mean day-degree requirement. The time for development from inflorescence appearance to opening was also strongly related to the mean air temperature but a regression of developmental rate on mean day length .times. temperature accounted for considerably more of the variance. The quantitative effects of temperature derived here could be used in the management of breeding material to ensure synchrony of inflorescence opening or rapid seed ripening and as a guide to the climatic requirements for satisfactory onion seed production.
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页码:103 / 108
页数:6
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