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Effects of Pollen Viability and Pistil Receptivity on Seed Set for Artificial Pollination in Strawberry  

Kim, Dae-Young (Vegetable Research Division, National Institute of Horticultural & Herbal Science, RDA)
Yoon, Moo- Kyung (Vegetable Research Division, National Institute of Horticultural & Herbal Science, RDA)
Do, Kyung-ran (General Service Division, National Institute of Horticultural & Herbal Science, RDA)
Kim, Tae il (Breeding Team, Nonsan Strawberry Experiment Station)
Publication Information
Korean Journal of Breeding Science / v.41, no.4, 2009 , pp. 496-501 More about this Journal
Abstract
In order to promote the efficiency of strawberry breeding programs, pollen viability of strawberry, 'Seolhyang' was investigated using the fluorochromatic reaction test and seed set under controlled environment. Pistil receptivity was also assessed by hand pollination. Four varieties including 'Maehyang' were used for the test of pistil receptivity with 'Seolhyang' as a pollen parent. Pollen viability remained high for several days under dry conditions as below 33% relative humidity while the greatest loss of viability occurred at 76% relative humidity. The viability was rapidly decreased at high humidity and almost all grains were unviable in 7 days after storage. Pollen viability does not appear to be drastically reduced if the relative humidity is low. Therefore, humidity is more important factor than temperature for the pollen viability in Fragaria${\times}$ananassa. The rate of seed set by hand pollination lasted higher than the average of 77.2% from 2 to 8 days after emasculation when the daily average temperature was around $15^{\circ}C$ in plastic house. It began to decline gradually from 10 days and had decreased dramatically after 12 days except several cultivars. Based on the daily mean accumulated temperature, it is recommended to have an artificial pollination between the range of $45{\sim}140^{\circ}C$ after the emasculation to increase the rate of seed set in strawberry.
Keywords
Fragaria${\times}$ananassa Duch.; Pollen viability; Pistil receptivity;
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