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progressive water stress . Biol. Plant. 61 : 333 – 341 . Bradford , M.M. 1976 . A rapid and sensitive method for the quantitation of microgram quantities of protein
intensity of water stress followed by recovery. Physiol. Plantarum , 119 , 503--512. Antioxidative defense system in an upland rice cultivar subjected to increasing intensity of water stress followed by recovery
A diallel cross involving six wheat varieties, namely Sehar 06, Punjab 96, GA 2002, Barani 83, Kohistan 97 and Chakwal 86 was carried out to determine the mode of gene action for some physio-morphological traits under water stress conditions. Analysis of variance showed highly significant differences among genotypes for all the traits studied. Additive type of gene action with partial dominance was observed for flag leaf area, stomatal frequency, leaf venation, days to heading and spike density while 100-grain weight was controlled by over dominance. Additive type of gene actions shows the fruitfulness of early selection for the traits while over dominance type of gene action indicates selection in later generations. Epistasis was absent for all the traits studied.
512 Sullivan, C. Y., Eastin, J. D. (1974): Plant physiological responses to water stress. Agric. Meteorol. , 14 , 113-127. Plant physiological responses to water
Steponkus, P. L., Cutler, J. M., O'Toole, J. C. (1980): Adaptation to water-stress in rice. pp. 401- 419. In: Turner, N. C., Kramer, P. J. (eds.), Adaptation of Plants to Water and High Temperature Stress. J. Wiley & Sons, New York
Water is a distinguished stress factor of soils and ecosystems. The description and analysis of positive or negative soil-water stresses are the preconditions of the efficient control of their mechanisms, reversible and/or irreversible consequences. The most significant soil-water stress is extreme moisture regime: water surplus (flood, water-logging, over-moistening) or water deficiency (drought). Their main reasons are the irregular atmospheric precipitation; limited water infiltration into and storage within the soil; high evaporation, surface runoff and filtration losses. In addition to the direct impacts the consequences are the changes in the mass and energy regime of soils and in their biogeochemical cycles. The possibilities of the control of soil-water stress are: help infiltration, storage and availability of soil water; improve the plants’ water uptake; irrigation and drainage.
., Johnson, J. D. (1988b): Physiological and morphological responses of three half-sib families of loblolly pine to water-stress conditioning. Forest Science , 31 , 487-495. Forest Science
America, Madison, WI, USA. Qadir, G., Saeed, M., Cheema, A. M. 1999: Effect of water stress on growth and yield performance of four wheat cultivars. Pak. J. Biol. Sci. , 2 , 236-239. Effect
381 384 Hejnák V. — Križková J.:2004. The effect of water stress on photosynthesis of spring barley — Zeszyty problemowe postepów nauk rolniczych 496 241–249 pp
Anda, A. 2001a. Micro-meteorological observations and modification of canopy microclimate. DSc Thesis. Budapest, Hungary, 149 pp. (In Hungarian) Anda, A. 2001b. Influence of crop water stress index on the
