ISHS Acta Horticulturae 262: V International Symposium on Rubus & Ribes
THE INFLUENCE OF LEAF:FRUIT RATIO ON GAS EXCHANGE CHARACTERISTICS OF RED RASPBERRY LEAVES |
| Authors: | J. Scott Cameron, Carol A. Hartley |
| Abstract:
The influence of reduced leaf area on gas exchange characteristics of ‘Amity’ red raspberry leaves was studied on fruiting plants in the field. Leaf area was manipulated by removing approximately 33 or 66% of total cane leaf area while fruit was green and expanding. Carbon dioxide (CO2) assimilation rates of trifoliate leaves subtending fruiting laterals were measured during the following two days. Yield components were also measured including leaf area and fresh and dry weight of fruit per lateral and per cane. CO2 assimilation rates increased in response to reduced leaf area. While an inverse linear relationship between carbon assimilation rate and leaf:fruit ratio (dry weight of leaf tissue/dry weight of reproductive tissue) was observed per cane, such a relationship was not observed within fruiting laterals. | |
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