Year: 1990
Type: article
Abstract: The effect of temperatures during different developmental stages on the time of initiation and development of flower buds of L. squamigera and L. radiata which blooms in mid-August and late September, respectively, was studied.1. Flower initiation occurred between 10° and 30°C, but the optimum temperature for flower initiation and subsequent differentiation to stage 8 of floral organs was 30°C in both species.2. The development of flower buds, from stage 8 of complete carpel differentiation to stage 12, when pollen become mature and functional, progressed more rapidly at 20° and 25°C than it did at 30°C.The time intervals for flower development from stage 8 to 12 at optimum temperatures were 4 and 8 weeks for L. squamigera and L. radiata, respectively.3. The range between 20° and 25°C was also optimum for the development of flower buds from stage 12 to anthesis.Anthesis in L. squamigera and L. radiata at 30°C was delayed about 10 and 30 d, respectively, as compared to that at 20° or 25°C.All L. squamigera plants held between 10° and 30°C flowered, but only those of L. radiata held between 20° and 30°C flowered.4. Although plants of L. radiata kept at 20°C after carpel formation flowered normally, those which were transferred to 30°C for 3 to 5 weeks and then returned to 20°C bloomed 1 month earlier.5. Bulbs of L. radiata exposed to 15°C for 6 weeks and transferred to 20°C at carpel initiation (stage 8 to 9) flowered normally; whereas, those transferred to 15°C for 2 weeks at or after pollen formation (stage 9-12) and returned to 20°C bore blasted flowers.6.These results demonstrate that plants of L. squamigera and L. radiata bloom at different times under natural conditions, after carpel primordium is completed, as a response to ambient temperatures which govern the rates of subsequent floral development.
DOI: 10.2503/jjshs.59.377
Institution: Osaka Prefecture University
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: diamond
OpenAlex ID: W2003453759