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Diurnal changes in SLW (specific leaf weight‐mg dry wt cm −2 leaf area) of recently fully expanded leaves reflect the photosynthate production‐translocation balance within the leaf. Therefore, SLW should increase when synthesis exceeds transport and should decrease when transport exceeds synthesis. SLW had a close negative correlation with NCE (net carbon dioxide exchange rate‐mg CO 2 dm −2 hr −1 ) as measured on attached alfalfa ( Medicago sativa L.) leaves. Since maximum NCE coincided with minimum SLW (after about 1 hr illumination) and furthermore, a secondary maximum NCE occurred concomitantly with a secondary minimum SLW (after about 4‐hr illumination) a causal relationship between the changes in NCE and SLW is suggested. The close negative relationship between NCE and SLW is interpreted as additional evidence for a feed‐back inhibition of photosynthesis.
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N. J. Chatterton (1973) studied this question.
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