| Comments |
P.16968 left column 3rd paragraph: "Plant Development and Photosynthetic Rates: Developmental stages and photosynthetic metabolism are closely linked. Leaf morphology, pigmentation, photosynthetic rate, enzyme activities, and carbon partitioning impact plant development. In turn, the expansion of leaves, development of reproductive sink, and leaf senescence influence photosynthesis (ref 30). Leaves of 3- to 5-wk-old Arabidopsis plants had comparable amounts of chlorophyll per unit of leaf fresh weight (FW) and net photosynthetic rates per unit of leaf area, however, RuBisCO content per unit FW decreased with age (Fig. 1, Inset), and 5-wk-old plants exhibited flower development. Fully expanded leaves of 4-wk-old plants were selected for all further experiments. Light–response curves (Fig. 1) indicated that plants acclimated to high light have ∼38 ± 4% greater maximum photosynthetic rates than nonacclimated plants (measured at ∼2,000 µmol×m^−2×s^−1) and an altered ratio of chlorophyll a/b (Fig. S1)." |