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Photosynthesis of two walnut cultivars as influenced by fruiting.

Net photosynthetic rate (P N ), chlorophyll content (Chl content), transpiration rate (E) and intercellular CO 2 concentration (C i ) of leaves on fruiting and vegetative shoots of J. hopeiensis Hu. ('Yihe 1') and J. regia L. ('Qingxiang') were measured using a CI-301PS open gas analysis system. The results indicated that the fruit affected the P N rate, but the effect was inconsistent. From flowering to fruit oil production period, the P N of leaves on the fruiting shoots of the both cultivars was higher than that on the vegetative shoots. During the fruit maturity period, the P N and Chl content of leaves on the fruit-bearing shoots of both cultivars were lower than that on the growing shoots. There was significant correlation between P N and Chl content, E and C i .