biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 56:509-515, 2012 | DOI: 10.1007/s10535-012-0049-7

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

F. X. Tian1, J. F. Gong1, G. P. Wang1,2, G. K. Wang1, Z. Y. Fan1, W. Wang1,*
1 State Key Laboratory of Crop Biology, Shandong Key Laboratory of Crop Biology, College of Life Science, Shandong Agricultural University, Tai'an, Shandong, P.R. China
2 Shandong Institute of Pomology, Tai'an, Shandong, P.R. China

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.

Keywords: antioxidative defense system; chlorophyll degradation; chloroplast and thylakoid ultrastructures; drought stress; photosynthesis
Subjects: photosynthesis; water stress; stay-green mutant; chlorophyll; chloroplast ultrastructure; net photosynthetic rate; transpiration rate; stomatal conductance; malondialdehyde; superoxide dismutase; peroxidases; catalase; ascorbate peroxidase; water potential; osmotic potential; water content; sugars; proteins

Received: February 19, 2011; Accepted: May 31, 2011; Published: September 1, 2012  Show citation

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Tian, F.X., Gong, J.F., Wang, G.P., Wang, G.K., Fan, Z.Y., & Wang, W. (2012). Improved drought resistance in a wheat stay-green mutant tasg1 under field conditions. Biologia plantarum, 56(3), 509-515. doi: 10.1007/s10535-012-0049-7
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