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held at the 90th ASHS Annual Meeting Nashville, Tennessee 28 July 1993 sponsored by the Cropping Efficiency and Photosynthesis Working Group published by the American Society for Horticultural Science Alexandria, VA 22314-2824 as a special insert in

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179 ORAL SESSION (Abstr. 715-722) CROSS-COMMODITY PHOTOSYNTHESIS

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improve the adaptability and salt tolerance of jujube cultivars. The salt tolerance of wild jujube cultivars currently depends mainly on the use of tolerant rootstocks. Wild jujube often is used as an excellent rootstock for jujube. Photosynthesis is an

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Raspberries (Rubus idaeus L.) were grown for 5 years with three floor management treatments: clean cultivation (CC) and ground covers of white clover (Trifolium repens L.) (WC) and perennial ryegrass (Lolium perenne L.) (PR). Primocane growth was strongest with WC and weakest with PR. Fruit production did not differ between WC and CC treatments and was higher than with PR. On 22 Aug. and 10 Sept. in the last year, primocanes grown with WC were taller, had more nodes and a higher dry weight, contained more N, and had retained more leaves than those grown with PR. Net CO2 assimilation per unit leaf area was higher with WC than with PR, and the difference was greater at the more proximal position. The estimated net CO2 assimilation rate per primocane was more than twice as high with WC than with PR.

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supply of K and Na accumulation in low-K lettuce could affect plant growth, but the underlying physiological changes caused by this remain unknown. Photosynthesis and chlorophyll fluorescence are essential for plant growth and development, which partially

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photosynthesis, although reproductive processes can be more sensitive and specific targets of stress in some species. In many crops, dry conditions occur after full canopy development so that slowing of leaf area development would have little impact on biomass

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mediating this response ( Kinoshita et al., 2001 ; Zeiger et al., 2002 ). Further, increased stomatal density and aperture under high percentages of blue radiation may increase a plant’s capacity for CO 2 uptake, ultimately increasing photosynthesis

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the leaf in response to water deficit ( Cifre et al., 2005 ). As plants transition from no or low water deficit to moderate plant water deficit, g S generally declines into the 0.05 to 0.15 mol·m −2 ·s −1 H 2 O range, photosynthesis and

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roles of B in plant function, apart from the structural function in walls ( Bolaños et al., 2004 ). For example, it is currently debated as to whether effects of B deficiency (or toxicity) on photosynthesis are primary or secondary, or early or late

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