|Author:||Shah, N. H. ; Paulsen, G. M.|
|Book Group Author:||NA|
The present study aims to compare effects of high temperature and drought and to ascertain their interactions on photosynthesis and productivity of wheat. Cv. Len plants were uniformly grown in silt-loam soil [surface horizon of Ivan and Kennebec silt loams (fine-silty, mixed, mesic cumulic Hapudolls)] until anthesis and then subjected to day/night temperatures of 15/10, 25/20, or 35/30°C and moisture regimes of no drought (field capacity) and drought (-2.0 to -2.8 MPa plant water potential) in controlled environments until maturity. High temperature hastened the decline in photosynthetic rate and viable leaf area during maturation, decreased shoot and grain mass and kernel weight and soluble sugar content at maturity and reduced water use efficiency. Drought increased stomatal resistance; decreased photosynthesis, viable leaf area, shoot mass, grain mass and kernel weight and soluble sugar content and enhanced water use efficiency. Adverse effects were much more pronounced at high temperature than low temperature. Osmotic adjustment to drought was apparently promoted by low temperature of wheat to high temperature would improve its adaptation to regions with elevated temperature and either ample or deficit moisture.
|Pages:||67 - 74|
|Journal:||Asian Journal of Plant Sciences|
crop yield, drought, drought resistance, flowering, kernels,leaf area, leaves, maturation, osmosis, photosynthesis, plantdevelopment, plant water relations, pot experimentation, seed weight,shoots, sugar content, temperature, water stress, water use efficiency,wheat, Triticum, Triticum aestivum, Poaceae, Cyperales, monocotyledons,angiosperms, Spermatophyta, plants, eukaryotes, Triticum, anthesis,carbon assimilation, carbon dioxide fixation, drought tolerance, FieldCrops (FF005) (New March 2000), Plant Physiology and Biochemistry(FF060), Plant Water Relations (FF062), Plant Production (FF100), PlantDisorders and Injuries (Not caused directly by Organisms) (FF700),Environmental Tolerance of Plants (FF900)