Scientia Agricultura Sinica ›› 2012, Vol. 45 ›› Issue (1): 192-198.doi: 10.3864/j.issn.0578-1752.2012.01.023

• RESEARCH NOTES • Previous Articles    

Effect of Paclobutrazol on Starch Accumulation and Related Enzyme Activity of Storage Root in Edible Sweet Potato cv. Beijing 553

 CHEN  Xiao-Guang, SHI  Chun-Yu, WANG  Zhen-Lin, ZHANG  Li-Ming, ZHANG  Xiao-Dong   

  1. 1.山东农业大学农学院/作物生物学国家重点实验室，山东泰安 271018
    2. 山东省农业科学院，济南 250100
  • Received:2011-04-18 Online:2012-01-01 Published:2011-05-26

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Abstract: 【Objective】 The objective of this study was to discuss the effects of paclobutrazol on the physiological mechanism of promotion of the storage root growth rate and increase of storage root yield in edible sweet potato cv. Beijing 553.【Method】Field plot experiments with paclobutrazol at M0, 100 mg•kg-1 (M1), and 200 mg•kg-1 (M2) were conducted in a field at agricultural experiment station of Shandong Agricultural University in summer crop seasons of 2008 and 2009, using the typical varieties of edible sweet potato Beijing 553. There were three replicates for each treatment. The changes of starch accumulating characteristics and activities of enzymes involved in starch synthesis were determined by using periodic sampling during storage root development.【Result】Paclobutrazol significantly improved the activities of sucrose synthesis (SS) and adenosine diphosphorate glucose pyrophosphorylase (ADPGase), reduced the sucrose content in storage root. As a result, the starch accumulating rate and starch content were improved, and the starch production increased. Increase of the concentrations of paclobutrazol significantly increased the fresh weight per lump and fresh yield. Correlation analysis showed that ADPGase activity was positively correlated with starch content and starch accumulation rate and the correlation coefficients were 0.688 and 0.714, respectively (P＜0.05). The correlation analysis also showed that SS activity was significantly positively correlated with starch content as well as the starch accumulating quantity and the correlated coefficients were 0.58 and 0.81 respectively (P＜0.05).【Conclusion】The results suggested that spraying paclobutrazol increased yield of storage root, which resulted from the increased starch content and the improved starch accumulating rate. The higher activities of SS and ADPGase were found in resulting in higher yield of storage root in sweet potato.

Key words: Paclobutrazol, sweet potato, ADPGase, SS

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