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Acta Agron Sin ›› 2009, Vol. 35 ›› Issue (6): 1068-1077.doi: 10.3724/SP.J.1006.2009.01068

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

Canopy Characteristics and Its Correlation with Photosynthesis of Super High-Yielding Hybrid Cotton Biaoza A1 and Shiza 2

DU Ming-Wei1,FENG Guo-Yi1,YAO Yan-Di1,LUO Hong-Hai1,ZHANG Ya-Li1,XIA Dong-Li2,ZHANG Wang-Feng1*   

  1. 1Key Laboratory of Oasis Ecology Agriculture of Xinjiang Construction Crops,College of Agriculture,Shihezi University,Shihe zi 832003,China;2Regimental Farm 149,Agricultural Division 8 of Xinjiang Construction Crops,Shihezi 832052,China
  • Received:2009-01-10 Revised:2009-03-14 Online:2009-06-12 Published:2009-04-16
  • Contact: ZHANG Wang-Feng，E-mail:zhwf_agr@shzu.edu.cn;Tel:0993-2057326

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Abstract:

Alterations of canopy architecture improving photosynthesis may be a way to increase the yield of cotton. Study on the relationship between canopy characteristics and photosynthesis is of great significance to excavate yield potential and construct super high-yielding cultivation technique system. The present investigation was undertaken in the field experiment to evaluate the canopy characteristics, such as leaf area distribution, leaf angle and light distribution, and its correlation with canopy photosynthesis of super high-yielding hybrid cotton (lint 3 500 kg ha-1). Two super high-yielding hybrid cotton cultivars, Biaoza A1 and Shiza 2, were grown with Under-Mulch-Drip irrigation. The results revealed that super high-yielding hybrid cotton had higher leaf area index with longer duration during growth stages. Higher light absorption was observed with better light transmittance in the mid layer of canopy and less light leakage in the lower layer of canopy in super high-yielding hybrid cotton. Higher canopy photosynthetic rate with longer duration was also observed during growth stages. Furthermore, in the late growth stage, non-foliar organs, especially the stem of super high-yielding hybrid cotton remained higher photosynthetic capacity. The photosynthetic contribution rate of stem was 1.6-4.9 times that of the high-yielding traditional cotton, which is an important reason for hybrid cotton to remain superiority of canopy photosynthesis in the late growth stage. In the effective utilization of light energy and promotion of assimilations transport to boll promptly, super high-yielding hybrid cotton has higher anastomosis degrees among leaf, boll and light distributions in each layer of canopy, which is beneficial to enhancing hybrid cotton yield potential.

Key words: Canoopy characteristics, Light distribution, Canopy apparent photosynthesis, Hybrid cotton, Super high-yielding


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