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Acta Agron Sin ›› 2012, Vol. 38 ›› Issue (08): 1513-1521.doi: 10.3724/SP.J.1006.2012.01513

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

Effect of Water Stress on Seedling Growth and Photosynthetic Characteristics in Broomcorn Millet

FENG Xiao-Min1,ZHANG Yong-Qing1,2,*   

  1. 1College of Life Science, Shanxi Normal University, Linfen 041000, China; 2 College of Urban and Environmental Sciences, Shanxi Normal University, Linfen 041000, China
  • Received:2011-11-23 Revised:2012-04-20 Online:2012-08-12 Published:2012-06-04
  • Contact: 张永清, E-mail: yqzhang208@126.com

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Abstract: The response of main growth characters and photosynthetic parameters in seedlings of Broomcorn millets cultivars Longmi 4 (drought resistant), Jinshu 7 (drought-sensitive) and 5283 Huang (medium drought resistant) to three different drought stresses and normal irrigation were studied in a pot experiment. The result showed that drought stress decreased plant height, leaf area, root weight, chlorophyll content, and root activity. In addition the decreased range of Jinshu 7 was bigger than that of Longmi 4 and 5283 Huang. With the increasing of drought stress, fixation fluorescence value (Fo) and non photochemical quenching coefficient (qN) increased significantly, in Longmi 4, 5283 Huang, and Jinshu 7, Fo increased by 24.6%, 34%, and 40.8%; qN increased by 0.956, 1.083, and 2.183, however,Fv, Fm, Fv/Fm, Fv/Fo, and qPall decreased under water stress,with the significant differences compared with that from those in the control under moderate stress and serious stress. Water stress decreased photosynthetic rate, transpiration rate, stomatal conductance and CO2 concentration, which were lower in Longmi 4 than in Jinshu 7 and 5283 Huang, indicating that higher photosynthetic efficiency, stronger light energy transfer capacity and greater relative growth rate in Longmi 4 may be the major physiological traits adapted to drought stress. Sensitivity of broomcorn millet leaves to light increased under water stress, making injury of drought and photo inhibition to photosystem II, the severer drought and the weaker drought resistance, therefore we should water the broomcorn millet seedlings to avoid the injury of severe drought and high light.

Key words: Proso, Drought stress, Light responses of photosynthesis, Chlorophyll fluorescence parameters

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