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Acta Agron Sin ›› 2009, Vol. 35 ›› Issue (12): 2252-2257.doi: 10.3724/SP.J.1006.2009.02252

• TILLAGE & CULTIVATION · PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Distribution of Sugar Content in Corn Stalk

BIAN Yun-Long,DU Kai,WANG Yi-Jun,DENG De-Xiang*   

  1. Key Laboratory of Crop Genetics and Physiology of Jiangsu Province，Yangzhou University，Yangzhou 225009，China
  • Received:2009-04-21 Revised:2009-08-20 Online:2009-12-10 Published:2009-10-13
  • Contact: DENG De-Xiang，Tel: 0514-87979082

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Abstract:

Increasing the sugar content in silage corn stalk will improve the forage quality and palatability, the study on which can provide valuable information for silage corn breeding on stalk high sugar content. Three different genotypes, normal corn “Suyu 16”, sweet corn “05-8” and super sweet corn ‘Yangtian 1’, were investigated in this study. The sugar content (Brix values) of corn stalk was evaluated at seven stages using the pocket refractometer PAL-1. Results of two-year experiment were as follows: (1) Sugar content of corn stalk increased with the position of internodes from bottom to top, usually with the highest in ear internode or the internodes immediately above or below it. The relationship between sugar content and internode position varied from different genotypes and were modeled using the following three nonlinear equations: Y = 5.0277 exp(0.020564X - 0.017816X2) for Suyu 16, Y = 8.8489 exp(0.05949X - 0.006454X2) for 05-8 and Y = 9.6652 exp(0.06944X - 0.009475X2) for Yangtian 1, respectively. (2) The stalk sugar content of “Suyu 16” changed in a single peak curve, decreased at late growing stage. However, the stalk sugar content of “05-8” and “Yangtian 1” was increased at late growing stage. The difference of stalk sugar content may be related to the grain filling characteristics of the three genotypes. (3) Results of variance analysis of nested design indicated highly significant variation for sugar content of stalk among three corn genotypes, the total sugar content was the highest in super sweet corn, and the second highest in sweet corn. Moreover, sugar contents significantly varied depending on different internodes and different measurement stages. (4) Removing ear resulted in the increased sugar content in corn stalk. Additionally, the kernel sink-potential may influence the accumulation of sugar in corn stalk.

Key words: Stalk and internodes, Sugar content, Variance Analysis of nested design, Corn

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