Quantitative analysis of photosynthetic characteristics of mulberry leaves.
1992
Chen D.
The changes of three photosynthetic parameters, i.e. irradiance saturated net photosynthetic rate (Pmax), photochemical efficiency (ep), and dark respiration rate (RD), which characterize the photosynthetic behavior of mulberry leaves in a community, were investigated. The values of the parameters were estimated by fitting a rectangular hyperbola type model to the data of the response of net photosynthetic rate to irradiance using non-linear regression method. The parameters changed with leaf age along a usual pattern during leaf ontogeny; Pmax, and ep reached the maximum at about 30 d since the leaf unfolding. RD decreased with leaf age before the leaf reached the full expansion, then increased with leaf senescence. In the canopy, Pmax increased from lower to higher leaf layers, and on a branch Pmax reached its maximum at about the 3rd leaf from tip. A linear relationship was found between the Pmax and the nitrogen content. Pmax also changed with growing season.
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