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Hui-lian Xu, Laurent Gauthier, and André Gosselin

125 POSTER SESSION 18 Nutrition & Photosynthesis/Vegetable Crops

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Shin Hiratsuka, Yuka Yokoyama, Hiroshi Nishimura, Takayuki Miyazaki, and Kazuyoshi Nada

photosynthesis by shading, weakening fruit sink strength resulting from lower light and increased temperature and moisture in the bag, or both. However, little supportive experimental evidence has been provided. Photosynthesis occurs in fruit of many crop plants

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Luca Corelli-Grappadelli and E. Magnanini

Based on a commercially available net photosynthesis (Pn) unit coupled to a custom-built chamber that does not require air conditioning, a low-cost system to measure whole-tree gas exchange in the field is described. The temperature in the chamber is influenced by air flow in relation to tree size. A flow of 20 liters·s-1 (equal to ≈1.5 chamber volume changes/min) was sufficient to maintain the leaves of an 11-year-old `Golden Delicious'/M.27 tree at a temperature similar to that of the ambient air and control CO2 gradients in the chamber. The system has been in operation on apple (Malus domestica Borkh.) trees for up to 4 months without modifying tree behavior.

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Dominique-André Demers, Sylvain Dubé, Serge Yelle, and André Gosselin

85 ORAL SESSION 24 (Abstr. 191–198) Photosynthesis/Vegetables & Fruit

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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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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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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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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