Improved drought resistance in a wheat stay-green mutant tasg1 under field conditions

Abstract

We investigated the drought resistance of a wheat (Triticum aestivum L.) stay-green mutant tasg1 and its wild-type (WT) in field experiments conducted for two years. Drought stress was imposed by controlling irrigation and sheltering the plants from rain. Compared with the WT, tasg1 exhibited a distinct delayed senescence under both normal and drought stress conditions, as indicated by slower degradation of chlorophyll and decrease in net photosynthetic rate than in WT. At the same time, tasg1 mutants maintained more integrated chloroplasts and thylakoid ultrastructure than did WT plants under drought stress. Lower malondialdehyde content and higher antioxidative enzyme activities in tasg1, compared to WT, may be involved in the stay-green phenotype and drought resistance of tasg1.

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Abbreviations

APX:

ascorbate peroxidase

CAT:

catalase

ci :

intercellular CO2 concentration

DAA:

days after anthesis

DS:

drought stress

E:

transpiration rate

gs :

stomatal conductance

MDA:

malondialdehyde

OA:

osmotic adjustment

PN :

net photosynthetic rate

POD:

peroxidase

RWC:

relative water content

SOD:

superoxide dismutase

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Correspondence to W. Wang.

Additional information

Acknowledgements: This study is supported by National Natural Science Foundation of China (No. 30671259) and by Institution of Science and Technology of Shandong Province in China.

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Tian, F.X., Gong, J.F., Wang, G.P. et al. Improved drought resistance in a wheat stay-green mutant tasg1 under field conditions. Biol Plant 56, 509–515 (2012). https://doi.org/10.1007/s10535-012-0049-7

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Additional key words

  • antioxidative defense system
  • chlorophyll degradation
  • chloroplast and thylakoid ultrastructures
  • drought stress
  • photosynthesis