abstract three pear genotypes (nazkeh, lasoreh and qevilah), grown in 2l containers, were studied under four irrigation regimes in order to evaluate the leaf relative water content (rwc), photosynthesis, leaf gas exchanges and plant dry weight induced by water stress. control treatment everyday was irrigation. irrigation was practiced when soil water potential reached at -0.4, -0.8, and -1.2 mp...

grafting of cucurbitaceae species to some rootstocks seems to be especially beneficial for the nitrogen nutrition of these plants. moreover, melons (cucumis melo l.) have been considered among those plants that could benefit from the addition of silicon (si) in the nutrient solution (ns). thus, two experiments were carried out in the following order: (i) it was investigated how grafting affects...

this study investigated the variation between two sugar beet (beta vulgaris l.) cultivars with respect to growth parameters and photosynthetic rates of individual attached leaves during salinization. sugar beet plants grown in sand culture were gradually exposed to different levels of salinity (0, 50, 150 , 250, and 350 mm, nacl+cacl2 in 5:1 ratio). salt concentrations significantly decreased a...

altitude either during physical maturation (at age 10±4 yr) or as adults (at age 26±4 yr). The relative degree of acclimatization achieved in these lowland residents was assessed through their comparison both with normal sea-level values and with two additional groups of short-term sojourners and natives to 3,100 m. DLco at rest and work was significantly elevated above normal and above sojourn...

1. I ntroduction 2. P artitioning of O2 and CO2 Exchange Across the Respiratory Surfaces 2.1. P rimitive Ray‐Finned Fishes (Actinopterygii) 2.2. L obe‐Finned Fishes (Sarcopterygii) 2.3. J awless Fishes (Agnatha) 3. B lood O2 Transport 3.1. G eneral Principles of Hb Function 3.2. F actors AVecting the ArterioVenous O2 DiVerence 3.3. S urvey of Extant Primitive Fishes 4. T ransport and Eliminatio...

altitude either during physical maturation (at age 10±4 yr) or as adults (at age 26±4 yr). The relative degree of acclimatization achieved in these lowland residents was assessed through their comparison both with normal sea-level values and with two additional groups of short-term sojourners and natives to 3,100 m. DLco at rest and work was significantly elevated above normal and above sojourn...