Cell membrane stability: Combining ability and gene effects under heat stress conditions
Heat stress is an important production constraint of wheat during grain-fill period in India and in other parts of the world where the temperature become high during anthesis to maturity (grain-filling) stage of plant growth. This study determined the genetic control of heat tolerance through half diallel analysis of selected wheat genotypes. Heat induced damage of plasma membrane was assayed by membrane thermo-stability (MTS), which measure electrolyte leakage from leaf tissues after exposure to high temperature. Eight genotypes comprising heat tolerant and sensitive response to high temperature stress were hybridized in a half diallel. Electrolyte leakage or MTS was conducted at grain-filling stage of plant growth as ambient temperature become high enough to cause heat hardening of leaves. The mean square for GCA was higher in magnitude than that of SCA, but the components of genetic variance indicated considerable influence of dominance variance in determining inheritance of this trait. Results suggested that the selection for heat tolerant inbred lines based on MTS in this material may be more effective by reducing the dominance variance after a few generation of selfing particularly in a self-pollinated wheat crop. The varieties, Hindi 62 and NIAW 34 were good general and specific combiners in the tolerant group, while HD 2687 and WH 147 were good specific combiners in the heat sensitive group.
Keywordscell membrane stability heat stress combining ability gene effects heat susceptibility index heat response index
Unable to display preview. Download preview PDF.
- Bjorkman, O., Badger, M.R., Armond, P.A. 1980. Response and adaptation of photosynthesis to high temperature. In: Turner, N.C., Cramer, P.J. (eds), Adaptation of Plants to Water and High Temperature Stress. John Wiely & Sons, New York, pp. 233–239.Google Scholar
- Blum, A. 1988. Plant Breeding for Stress Environments. CRC Press, Inc., Boca Raton. pp. 201–220.Google Scholar
- Fischer, R.A., Byerlee, D.B. 1991. Trends of wheat production in the warmer areas: major issues and economic considerations. In: Wheat for the Non-traditional Warm Areas. Proc. of Conf., Iguazu, Brazil, 29 Jul.–3 Aug. 1990, Mexico, DF, CIMMYT, pp. 3–27.Google Scholar
- Hawker, J.S., Jenner, C.F. 1993. High temperature affects the activity of enzymes in the committed pathway of starch synthesis in developing wheat endosperm. Aust. J. Plant Physiol. 20:197–209.Google Scholar
- Lin, C.Y., Chen, Y.M., Key, J.L. 1985. Solute leakage in soybean seedlings under various heat shock regimes. Plant Cell Physiol. 26:1493–1498.Google Scholar
- Nagrajan, S. 2005. Can India produce enough wheat even by 2020. Curr. Sci. 89:1467–1471.Google Scholar
- Raison, J. K., Berry, P.A., Armond, C., Pike, S. 1980. Membrane properties in relation to the adaptation of plants to temperature stress. In: Turner, N.C., Kramer, P.J. (eds), Adaptation of Plants to Water and High Temperature Stress. John Wiely & Sons, New York, pp. 261–273.Google Scholar
- Reynolds, M.P., Balota, M., Delgado, M.I.B., Amani, I., Fisher, R.A. 1994. Physiological and morphological traits associated with spring wheat under hot irrigated conditions. Aust. J. Plant Physiol. 21:717–730.Google Scholar
- Saadalla, M.M. 1997. Inheritance of cell membrane thermo-stability as a criterion for heat tolerance in wheat. Alexandria J. Agric. Res. 42:15–26.Google Scholar
- Sullivan, Y.C. 1972. Mechanisms of heat and drought tolerance in grain sorghum and methods of measurements. In: Rao, N.G.P., House, L.R. (eds), Sorghum in Seventies. Oxford and IBH, New Delhi, pp. 247–264.Google Scholar
- Sullivan, C.Y., Ross, W.M. 1979. Selection for drought and heat tolerance in grain sorghum. In: Mussel, H., Staples, R.C. (eds), Stress Physiology in Crop Plants. John Wiley & Sons, New York, pp. 263–281.Google Scholar