高温時と低温時におけるタバコの日長反応の品種間差異

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A comparative study was made on the photoperiodic response using the following 10 varieties of tobacco differing in earliness and lateness : Nambu (very early) ; Matsukawa (early) ; Bright Yellow, Yellow Special-A and Xanthi (medium early) ; White Burley, Kokubu and Oxford 26 (late) , and Talcehara-tayo and Kochi-tayo (very la:te). These varieties were subjected to five different day-1ength, namely, 6, 8, 10, 12 and 14 hours. The experiments were conducted during summer months (June to September) at high temperature (23-30 'C) and also during winter (November to February) at low temperature (10-20 'C). The results obtained may be summarized as follows : 1. The earliest flower-bud initiation occured under 8-hours day in all of the varieties tested both at high and low temperatures. Reproductive growth tended to be delayed more and inore as the photoperiod was prolonged. As the retardation of flowering became more marked at the high temperature than at the low temperature, varietal differences in' this nature broadened more and more. 2. Differences in the responses to photoperiod and number of the total leaves of plants of these varieties tested at the end of the experiments enabled us to classify them into three groups, namely, (1) highly sensitive to longer photoperiod, (2) moderately sensitive and (3) slightly sensitive. Furthermore it was also recognized that most of the very late varieties belonged to the group, (1), medium to late varieties to the group (2) and early to medium varieties to the group. (3). However, there was a marked intravarietal difference in number of total leaves, the reason of which remained unknown.
日本育種学会の論文
1957-07-25

高温時と低温時におけるタバコの日長反応の品種間差異

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