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Acta Agron Sin ›› 2009, Vol. 35 ›› Issue (3): 560-565.doi: 10.3724/SP.J.1006.2009.00560

• RESEARCH NOTES • Previous Articles     Next Articles

Physiological and Biochemical Responses to Drought during filling Stage in Stay Green Sorghum B35

HUANG Rui-Dong;SUN Lu;XIAO Mu-Ji;ZHOU Yu-Fei   

  1. College of Agronomy,Shenyang Agricultural University,Shenyang 110161,China
  • Received:2008-06-24 Revised:2008-10-18 Online:2009-03-12 Published:2009-01-16

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Abstract:

Effects of drought on a typical stay green sorghum line B35 were investigated through analyzing the physiological and biochemical characteristics of sorghum plants with the treatments of weekly drought stress starting on the 10th day and the 30th day after anthesis respectively in pot experiment. Compared with CK, the stay green sorghum B35 showed higher chlorophyll content (SPAD value), photosynthetic rate and nitrogen content in leaf, stem and grain. Under the condition of drought stress, the increments of electrical conductivity rate, malondialdehyde content in B35 were less than those in CK, the increments of proline contents and decrements of leaf water potential in B35 were more than those in CK. The activities of superoxide dismutase (SOD) and peroxydase (POD) of B35 were higher than those of CK. We suggested that the stay green sorghum line could perform the physiological autoregulation effectively at the aspects of photosynthesis, nitrogen accumulation, cell membrane permeability of leaf, osmoregulation ability and activities of protective enzymes to adapt the drought.

Key words: Sorghum, Stay green, Drought resistance, Physiological and biochemical characteristics

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