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Acta Agron Sin ›› 2013, Vol. 39 ›› Issue (06): 1089-1095.doi: 10.3724/SP.J.1006.2013.01089

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

Effects of Clomequat-Uniconazole 30% Micro-Emulsion on Stem Physical and Chemical Characteristics of Rice

ZHANG Qian1,ZHANG Ming-Cai1,ZHANG Hai-Yan2,TAN Wei-Ming1,LI Zhao-Hu1,DUAN Liu-Sheng1,*   

  1. 1 Engineering Research Center of Plant Growth Regulator, Ministry of Education / College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China; 2 Heilongjiang 850 Farm, Hulin 158422, China
  • Received:2012-05-16 Revised:2012-12-06 Online:2013-06-12 Published:2013-03-22

Abstract:

Lodging is one of the most restrictive factors of cold ground rice to achieve higher yield. Using a cultivars Kendao 12 at the early jointing sprayed with a new plant growth regulator 30% chlormequat-uniconazole ME, we studied the effect of it on morphological and physiological characteristics, yield and yield components. The results indicated that 1.2 L ha-1 treatment of 30% chlormequat-uniconazole ME on rice leaves could markedly shorten the length of basal internodes and increase the diameter of them. In addition, cell microscopy showed that tight degree of cell in 1.2 L ha-1 treatment was enhanced, and the cells got shorten. Through the improvement of stem morphological characteristics, the bend breaking strength and radial compressive strength were respectively increased by 152.4% and 82.5% as compared with CK. The plant growth regulation could significantly increase the C/N value in the basal internode of stem at full-heading stage; increase contents of hemicellulose, cellulose and lignin of stem at later grain filling stage; significantly reduce GA3 content in the 2nd internodes; and improve rice yield and its components. Generally speaking, 30% chlormequat-uniconazole ME can enhance the quality of stem to improve lodging-resistance of rice.

Key words: 30% chlormequat-uniconazole ME, Rice, Stem, Physical and chemical characteristics, Cell anatomic structure, yield

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