|Author:||Mamnouie, E. ; Ghazvini, R. F. ; Esfahany, M. ; Nakhoda,B.|
|Book Group Author:||NA|
The effects of water deficit on the grain yield, yield components and physiological characteristics of barley (H. vulgare) cultivars were studied in a split plot design during 1999-2000 in Karaj, Iran. Five irrigation levels (0, 25, 50, 75 and 100% crop water requirements or CWR) and 6 barley cultivars tolerant (Karoon × Kavir and Reihani), moderately tolerant (Torkman and C-74-9) and sensitive (Kavir × Badia and Gorgan-4) to drought were evaluated in main plots and subplots, respectively. Water deficit induced stress, and reduced grain yield and yield components. Water deficit increased the canopy temperature, and cultivars that recorded higher canopy temperatures under non-stress conditions performed better under drought conditions. Severe stress reduced the chlorophyll content (SPAD values) considerably, but the differences were not significant between the 50, 75 and 100% CWR treatments. No significant differences were observed in the chlorophyll content of barley cultivars under drought conditions. The effect of irrigation on the photochemical efficiency of photosystem II (Fv/Fm) and other fluorescence parameters for all cultivars were significant. Fv/Fm values did not significantly vary among the cultivars at any level of irrigation. However, in general, Karoon × Kavir and Reihani showed better performance under water deficit conditions. The proline content significantly varied among the irrigation treatments, but its accumulation at any level of irrigation did not significantly vary among the cultivars. It was concluded that the higher canopy temperature (less negative ΔT) under well-irrigated conditions, and the higher grain yield, 1000-grain weight and Fv/Fm values under water stress conditions could possibly be the appropriate criteria for screening drought tolerant barley genotypes under field or laboratory conditions.
|Pages:||211 - 219|
|Journal:||Journal of Agricultural Science and Technology|
barley, canopy, chemical composition, chlorophyll, cropyield, cultivars, drought resistance, fluorescence, irrigation,photosystem II, plant composition, proline, stress, stress response,temperature, varietal reactions, water deficit, water stress, yieldcomponents, Iran, Hordeum vulgare, Hordeum, Poaceae, Cyperales,monocotyledons, angiosperms, Spermatophyta, plants, eukaryotes, WestAsia, Asia, Middle East, Developing Countries, Threshold Countries,chemical constituents of plants, cultivated varieties, droughttolerance, leaf canopy, watering, Field Crops (FF005) (New March 2000),Plant Breeding and Genetics (FF020), Plant Composition (FF040), PlantPhysiology and Biochemistry (FF060), Plant Production (FF100),Environmental Tolerance of Plants (FF900), Soil Water Management(Irrigation and Drainage) (JJ800) (Revised June 2002) [formerly SoilWater Management]