background and objectives: evaluation of the grain yield and yield components and also morphological traits can help to identify strategies for selection of resistant cultivars and increased crop yield production under heat stress condition. to this end, in experiment to evaluate of grain yield and yield components on 42 rice lines tolerant to heat stress from international rice research instit...

background: one of the key issues in determining the quality of water in rivers is to create a water quality control network with a suitable performance. the measured qualitative variables at stations should be representative of all the changes in water quality in water systems. since the increase in water quality monitoring stations increases annual monitoring costs, recognition of the station...

genetic diversity is necessary for breeding program and increasing genetic gain of selection in crop plants. with the onset of spring growth, spring cold stress is a problem for wheat crops at heading and also may be damaged some other parts of this plant. the aim of this study is the investigation of genetic diversity duo to artificial cold stress on the physiological traits, chlorophyll a, ch...