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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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J.D. Caldwell, J.F. Hancock, and J.A. Flore


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Hong-jia Xu, Masafumi Johkan, Toru Maruo, Natsuko Kagawa, and Satoru Tsukagoshi

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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Pat Bowen and Stan Freyman

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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James Bunce

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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Xinyi Chang, Junli Sun, Lianling Liu, Wang He, and Baolong Zhao

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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Joshua K. Craver, Krishna S. Nemali, and Roberto G. Lopez

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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Yahia Othman, Dawn VanLeeuwen, Richard Heerema, and Rolston St. Hilaire

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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F. Todd Lasseigne, Stuart L. Warren, Frank A. Blazich, and Thomas G. Ranney

by comparing temperature sensitivity of growth, basic physiological processes such as photosynthesis, and survival across a range of temperatures ( Burke, 1990 , 1995 ; Hopkins, 1999 ; Lambers et al., 1998 ; Larcher, 1994 ; Leegood, 1995 ). The

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Jinmin Fu and Peter H. Dernoeden

injury to plants would be expected to result in an increase in respiration and possibly a reduction in photosynthesis. A concomitant decrease in photosynthesis and increase in respiration could cause a harmful depletion of carbohydrates. Few studies have