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Acta Agron Sin ›› 2010, Vol. 36 ›› Issue (06): 1003-1010.doi: 10.3724/SP.J.1006.2010.01003

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

Relationship of Photosynthetic Carbon Assimilation Related Traits of Flag Leaves with Yield Heterosis in a Wheat Diallel Cross

WANG Xiu-Li1,2,HU Zhao-Rong1,2,PANG Hui-Ru1,2,DU Jin-Kun1,2,SUN Qi-Xin1,2,WANG Min1,2,NI Zhong-Fu1,2,*   

  1. 1Key Laboratory of Crop Heterosis and Utilization,Ministry of Education/State Key Laboratory for Agrobiotechnology/Key Laboratory of Crop Genomics and Genetic Improvement,Ministry of Agriculture/Beijing Key Laboratory of  Crop Genetic Improvement,China Agricultural University,Beijing 100193,China;2National Plant Gene Research Centre(Beijing),Beijing 100193,China
  • Received:2009-12-27 Revised:2010-03-15 Online:2010-06-12 Published:2010-04-14
  • Contact: NI Zhong-Fu,E-mail:wheat3392@cau.edu.cn

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Abstract:

In spite of commercial use of heterosis in agriculture, the physiological basis of heterosis is poorly understood. Photosynthetic carbon assimilation related traits of flag leaves, including photosynthetic capacity, stomatal conductance, intercellular CO2 concentration, transpiration rate, water use efficiency and efficiency of primary conversion of light energy, were measured at early, middle, and post grain-filling stages in a wheat (Triticum aestivum L.) diallel cross involving 20 hybrids and nine parents, with the purpose of determining the relationship of yield heterosis with these traits. The magnitude of heterosis varied subject to cross combination, trait, and developmental stage. Further analysis indicated that heterosis of photosynthetic carbon assimilation related traits was not correlated with that of spike length and effective spike per plant, but significantly correlated with that of other yield components. Moreover, at middle grain-filling stage, the heterosis of photosynthetic rate, intercellular CO2 concentration, water use efficiency and efficiency of primary conversion of light energy were significantly and positively correlated with those of fertile spikes per plant, thousand grain weight, yield per plant and yield of main stem, suggesting that higher photosynthetic capacity and water use efficiency could be one of the important physiological basis of wheat hybrid vigor.

Key words: Wheat, Photosynthetic carbon assimilation, Yield, Heterosis

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