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Ye Zhengwen; Morishita Masahiro; Tsuji Hiromi; Suzuki Toshimasa ( Horticultural Research Institute, Shanghai Academy of Agricultural Sciences,Shanghai 201106, China; Osaka Prefectural Agricultural and Forestry Research Center, Habikino-Shi Osaka 583,Ja  
The relationship between the crown diameter of stolon-derived plants and the sensitivity to flower bud induction was studied by exposing June-bearing strawberry cultivar "TOYONOKA" to short day(8h)(SD)and low night temperature(10℃ )(low ℃ )for 0,7, 14 and 21 days. The flower bud differentiation was hastened in all treatments in varying.degrees, but the results were obviously different among the plants with different crown diameters. The percentages of plants showing successful flower bud induction after 7 and 14 days treatments were 66. 7% and 100% separately for the plants with crown diameter over 0. 5 cm, whereas the sensitivity of the plants with crown diameter below 0. 5 cm to SD/low℃ was obviously lower, the percentages of the plants showing successful induction was only 11. 11 % after 7-day treatment, only in the 21-day treatment the flower bud induction rate reached 100%. In case of successful flower bud induction the flowering period was more advanced forthe small plants than for the large ones. The percentages of plants showing successful flower bud induction increased with the extension of SD/low℃ treatment duration. The results obtained from the plants dissected and observed microscopicaly corresponded to the flowering trend of the first and second flower clusters on the plants transplanted in field after SD/low℃ treatment. The flowering periodof the second flower clusters was about the same on the plants showing successfulinduction as on the control plants or the plants showing unsuccessful induction,this indicated that the SD/low℃ treatment had effect on the first flower clusters bud didn' t on the second ones. We also found that the flower number of the first flower clusters on the plants showing successful induction was normally less than that on the control plants or the plants showing unsuccessful induction after treatment.
【CateGory Index】: S435.4
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