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Acta Agron Sin ›› 2012, Vol. 38 ›› Issue (09): 1728-1733.doi: 10.3724/SP.J.1006.2012.01728

• RESEARCH NOTES • Previous Articles     Next Articles

Effect of Paclobutrazol under Different N-Application Rates on Photosynthesis and Starch Accumulation in Edible Sweetpotato

CHEN Xiao-Gang1,2,LI Hong-Min1,ZHANG Ai-Jun1,SHI Xin-Min1,TANG Zhong-Hou1,WEI Meng1,SHI Chun-Yu2,*   

  1. 1 Key Laboratory of sweetpotato biology and genetic breeding, Sweetpotato Research Institute, Chinese Academy of Agricultural Sciences, Xuzhou 221121, China; 2 National Key Laboratory of Biology, Agronomy College, Shandong Agricultural University, Tai’an 271018, China
  • Received:2011-12-16 Revised:2012-04-20 Online:2012-09-12 Published:2012-06-04
  • Contact: 史春余, E-mail: scyu@sdau.edu.cn, Tel: 0538-8246259

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Abstract: A field experiment was conducted to study the effects on leaf photosynthesis, root tuber starch accumulation and yield in edible sweetpotato (Ipomoea batatas L. Lam cv. Beijing 553) with two nitrogen treatments (120 and 240 kg ha–1) and three paclobutrazol (PP333 ) spraying levels (0, 100, and 200 mg ha–1). The result showed that increasing nitrogen application boosted Pn and chlorophyll content, reduced dry matter allocation in root tuber and starch accumulation rate, and significantly reduced the fresh weight per lump of root tuber(by 8.0%) and the starch yield and root tuber yield (by 30.7% and 20.5%). Spraying PP333 improved Pn and chlorophyll content, accelerated the transportation of carbohydrate from leaf to root tuber and enhanced its allocation in root tuber, the starch accumulation rate, significantly the fresh weight per lump of root tuber (by 18.6%) and the yield of starch and fresh weight of root tuber(by 46.1% and 32.5%). It was indicated that both starch accumulation and yield could be regulated by PP333 under high nitrogen application rate.

Key words: Edible sweepotato, Paclobutrazol, Nitrogen fertilization, Starch accumulation, Photosynthesis

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