| Abstract: | Young apple-trees were grown in four light intensities to assessthe differentia dependence of growth on reserve carbohydratesand current products of photosynthesis. Low light intensitycaused no greater depletion of reserve carbohydrates duringinitial growth in spring, and during the growing season a similarcomposition was maintained with all treatments despite largedifferences in dry-weight increment. The results suggest thatthere is an integrated phase of growth duringwhich carbohydrate composition is independent of external factors,and which may be followed by a labile phase duringwhich accumulation of reserves can be influenced. |
