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Acta Agron Sin ›› 2011, Vol. 37 ›› Issue (02): 355-361.doi: 10.3724/SP.J.1006.2011.00355

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

Dry Matter Production and Photosynthesis Characteristics of Three Hybrids of Maize (Zea mays L.) with Super-High-Yielding Potential

YANG Jin-Sheng1,2,WANG Yong-Jun2,3,ZHANG Ji-Wang1,LIU Peng1,LI Cong-Feng1,ZHU Yuan-Gang1,HAO Meng-Bo1,LI Deng-Hai2,*,DONG Shu-Ting1,*   

  1. 1 State Key Laboratory of Crop Biology / College of Agronomy, Shandong Agricultural University, Tai’an 271018, China; 2 Shandong Denghai Seed-breeding Co. Ltd. / Key Laboratory of Maize Breeding and Culture of Shandong Province, Laizhou 261448, China; 3 Research Center of Agricultural Environment and Resources, Jilin Academy of Agriculture Science, Changchun 130033, China
  • Received:2010-03-25 Revised:2010-08-06 Online:2011-02-12 Published:2010-11-16

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Abstract: The plant height and ear height are the important factors affecting the grain yield in maize (Zea mays L.) which determined the planting density. Obviously, it is essential for high yield to explore the dry matter production and photosynthesis characteristics of super-high-yielding potential hybrid maize with different plant heights and ear heights. Therefore, a field experiment with 82 500 plant ha-1 was conducted to evaluate the three hybrids (Denghai 661, DH661, the low-plant height and low-ear height; Denghai 701, DH701, the medium-plant height and medium-ear height; Xianyu 335, XY335, the high-plant height and high-ear height). The biomass, leaf area index (LAI), potential photosynthetic capacity (LAD), gas exchange parameters (light-saturated photosynthetic rate-Psat, stomatal conductance-gs and intercellular CO2 concentration-Ci) and chlorophyll fluorescence parameters (maximal efficiency of PS2 photochemistry-Fv/Fm, PS2 efficiency-ΦPSII and photochemical quenching co-efficient-qP) were determined. Yields of the three-type hybrids were over-15 000 kg ha-1, but there were no significant differences among the three hybrids under conventional planting conditions. The results analyzed by Richards model showed that DH661 had the highest yield potential among the three hybrids because its active growth period was about three weeks longer than that of XY335. The yield potential of DH661 was remarkably high from 28 d after anthesis to harvest stage since it remained the higher photosynthesis capability and radiation utilization efficiency, but that of XY335 decreased rapidly.

Key words: Super-high-yielding summer maize (Zea mays L.), Plant height and ear height, Dry matter production, Photosynthesis characteristics

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