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GrainGenes Reference Report: CRS-41-1405

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Reference	CRS-41-1405
Title	Genetic control of high temperature tolerance in wheat as measured by membrane thermal stability
Journal	Crop Science
Year	2001
Volume	41
Pages	1405-1407
Author	Ibrahim AMH Quick JS
Abstract	Summary: Heat stress is an important production constraint of wheat (Triticum aestivum L.) affecting many plant biological activities in the cell membrane. This study determined the genetic control of heat tolerance through diallel analysis of selected wheat germplasm. Heat-induced damage of plant membranes was assayed by the membrane thermal stability (MTS) assay, which measures electrolyte leakage from leaf tissue after exposure to high temperature. Six wheat genotypes ('TAM 107', 'TAM 108', 'Arlin',' Kauz', 'Glennson 82', and 'Siete Cerros') were hybridized in a complete diallel, and MTS was measured on 12 d old F1 seedlings. The mean square for general combining ability (GCA) was four times that of specific combining ability (SCA), indicating the importance of additive gene effects in acquired thermal tolerance. Maternal effects accounted for 67% of reciprocal variation, suggesting that maternal seed-source effects may be important in hybrid seed. These results suggest that heat tolerance based on MTS can be improved using the existing genetic variability available within the germplasm evaluated in this study
Keyword	[ Hide all but 1 of 61 ] abilities ability aestivum analysis assay biological activity cell cell membranes combining ability crop damage diallel diallel analysis electrolytes exposure gene general combining ability genetic genetic control genetic variability genotype genotypes germplasm heat heat resistance heat stability heat stress heat tolerance heritability high temperature hybrid leaf leakage leaves maternal effects membrane membranes old production seed seedling seedlings specific combining ability stability stress stresses temperature temperature tolerance thermal stability thermal tolerance time tissue tolerance triticum triticum aestivum variability variation wheat wheat genotypes wheat germ lasm winter wheat

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