| Effects of spraying PBO on flowering rate and carbohydrate accumulation of ‘Fuji’ apple trees |
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| DOI：10.7606/j.issn.1000-7601.2013.03.19 |
| Key Words: PBO apple tree flower bud differentiation carbohydrates |
| Author Name | Affiliation | | XING Libo | College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China | | ZHANG Xiaoyun | College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China | | SONG Xiaomin | College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China | | SONG Chunhui | College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China | | HAN Mingyu | College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China | | ZHAO Caiping | College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China | | LI Gaochao | College of Horticulture, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| In attempt to investigate the effects of spraying PBO on flowering rate and carbohydrate accumulation of ‘Fuji’ apple trees, different concentrations of PBP were sprayed on young apple (Malus domestica Borth.) cultivar ‘Fuji’ Nagafu No.2. The flowering rate, shoot growth and carbohydrate content changes of leaf and bud in apple trees were
studied also. The results showed that:(1)spraying PBO treatment could, to certain extent, improve flowering rate and
restrain shoot growth in upper, middle and basal part of ‘Fuji’ young apple trees. The spraying PBO with different concentrations had different effects on carbohydrate content changes of leaf and bud of in upper, middle and basal part of ‘Fuji’ young apple trees. Compared with control, spraying PBO with higher concentrations (4000 mg·L-1 and 6667 mg·L-1) could increase the content of the sucrose, glucose, sorbitol, total soluble sugar in leaf in upper, middle and basal part of ‘Fuji’ young apple tree in the early growth stage (from May to July), but significantly reduced starch content in leaf during this period. Similarly, spraying PBO with higher concentration significantly increased content of sorbitol and total soluble sugar in bud in June and significantly reduced starch content in bud in July. (2)Flower bud formation was
closely correlated to translocation or conversion of carbohydrate between leaf and bud. Spraying PBO of highest concentra-
tion (6667 mg·L-1) leaded to a significant positive correlation between sorbitol and total soluble sugar content and leaf and bud; however, corresponding correlation between starch content and leaf and bud was not significant. According to experiment results of thiis study and taking production investment into consideration, we proposed that spraying PBO treatment with 4000 mg·L-1 is effectiive in promoting flower bud formation of ‘Fujii’ apple trees in the period from May to July(the critical period for physiological diifferentiation of apple flower buds). |
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