Initiation and development of Lilium longiflorum Thunb. bulb scales affected by temperature and daylength Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/fq977x466

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  • The development of Easter lily Lilium longiflorum Thunb. 'Ace' bulblets from scales was used to study the influence of scale pre-cooling, growing temp, and daylength on scale initiation, scale "filling" (bulbing), and scale leaf formation. The development of 'Croft', 'Ace', and 'Nellie White' daughter bulbs in field-grown yearlings was also used to study scale filling and "feathering." Scale bulblet formation and development is a gradual process which proceeds at a fairly constant rate. Since bulblets formed at all temp (12°, 22°, and 27°C) and daylengths (8, 12, and 16 hr) in this study, it was concluded that there is no critical temp or daylength requirement for bulbing. Temp exerted a stronger influence on bulblet development than did daylength, a 10°C increase (from 12° to 22°C) nearly always doubling the growth response. A further increase in temp (to 27°C) seldom increased the growth response, and frequently decreased growth as compared with 22°C. Scale initiation and wt increase was near optimum at 22°C. Pre-cooling (0°C for 6 weeks) the scales from which the bulblets formed reduced the no. of new scales initiated and their wt. Scale leaves formed most readily at 22°C and under short days (8 hr). Pre-cooling the scales from which the bulblets formed reduced the no. of bulblets with scale leaves and their length. Daughter bulb scales of field-grown yearlings fluctuated in wt in a consistent manner and in proportion to their age and position in the bulb. The outer daughter scales had larger wt increases and filled a month longer than the inner scales. At the time of daughter axis elongation (sprouting), the inner scales either lost wt or ceased to gain wt before the outer scales responded. The no. and position of abnormally long feathered scales of 'Nellie White' were fairly constant in the 1972 season studied. Based on scale complement of the daughter bulbs, those that feathered were the 12th-27th scales and were in the outer half of the bulb.
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