Please use this identifier to cite or link to this item:
Effects of Air Temperature on Flowering and Fruiting in Loquat cv. "Mozi"
The early-season flower buds of loquat formed during August and September in Southern Taiwan usually fail to set due to relatively poor pollen viability. Hand pollination with viable pollen grains after cold storage produced 15 to 20% fruit set comparable to that under natural condition. Field sampling indicated that pollen yield and rate of germination of loquat increased with the development of inflorescence from September to December. The positive correlation between viability and cold weather led us to predict that the two processes are closely related. Results of temperature regulation experiment showed that the optimal temperature for the development of loquat inflorescence ranged from 18°to 23℃. Temperature above 25℃ were found to be unfavorable. A 4-hour treatment at 34℃ daily for a period of 5 days reduced the highly vital pollen (produced in December with germinating rate of 90%) to the level of viability of these produced in September (30% germinated). Besides, damaged pollen tubes, plasmoptysis were common place among pollens after high-temperature treatment. A measurement of plant tissue temperature especially leaves and flowers in September and October revealed that unshaded floral parts could reach 34℃ midday might have adverse effect on pollen viability. Lowering air temperatkure by shading not only would successfully bring about early-season fruit production ,but also enhanced fruit quality. Data obtained with hand pollination, temperature regulation and early-season shading in this experiment suggest tentatively that air temperature is the limiting factor for the control of pollen viability and successful fruit set of loquat in Taiwan.
|Appears in Collections:||園藝學系|
Show full item record
TAIR Related Article
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.