Influence of Temperature and Plant Growth Regulators on Pollen Germination and Pollen Tube Growth of Apple Cultivars Bred in Korea
2016
Kweon, H.J., National Institute of Horticulture and Herbal Science, Rural Development Administration, Gunwi, Republic of Korea | Park, M.Y., National Institute of Horticulture and Herbal Science, Rural Development Administration, Gunwi, Republic of Korea | Song, Y.Y., Korea Seed and Variety Service, Gimcheon, Republic of Korea | Son, K.M., Gyeongsangbuk-do Agricultural Research and Extension Services, Daegu, Republic of Korea | Sagong, D.H., Daegu University, Gyeongsan, Republic of Korea
This study was carried out to investigate the effect of temperature (15~40oC) and the spraying plant growth regulators (GA4+7+BA and prohexadione-calcium) during full blooming on pollen germination and pollen tube growth of the commercial apple cultivars ('Fuji' and 'Tsugaru') and apple cultivars bred in Korea ('Chukwang', 'Gamhong', 'Hongan', 'Honggeum', 'Hongro', 'Hwahong’, 'Hongso', 'Summer dream' and 'Sunhong'). Pollen germination and pollen tube growth were increased with increasing temperature from 15 to 25oC, but high temperature over 30oC inhibit those. The apple cultivar bred in Korea that shows the highest value on pollen germination and pollen tube growth at over 30oC was 'Sunhong'. The spraying GA4+7+BA increased pollen germination and pollen tube growth than control, but that effect was not show at 40oC. The spraying prohexadione-calcium was not affect to pollen germination and pollen tube growth. In conclusion, if the air temperature during full bloom of apple tree rises about 30~35oC, the spraying GA4+7+BA after artificial pollination will be good to increasing fruit set.
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