Morphological and physiological acclimations of coffee seedlings to growth over a range of fixed or changing light supplies

摘要: Abstract Acclimations to low and high light levels are located in opposite extremes. We examined how the coffee plant ( Coffea arabica ), which is considered be shade-demanding although it performs well under full sun exposure, can acclimate a range of regimens. hypothesised that growth physiological performance depends on total amount received by per day temporal order diurnal variations supply. The biomass accumulation allocation key photosynthetic traits pot-grown seedlings were over treatments as follows: plants grown entirely 100%, 40% or 10% sunlight; at either sunlight from sunrise midday then submitted until sunset; throughout afternoon. increased linearly with increasing supply; however, receiving amounts morning grew more than those Extensive morphological changes (e.g., specific leaf areas area ratios) primarily responsive rather fluctuations quality, given supply, noted. In contrast, unit among narrower apparently unrelated carbohydrate photoinhibition. Overall, we found poor leaf-level plasticity light. suggest adjustments number area, coupled whole-plant adjustments, could largely account for differences amongst treatments. also classified shade-tolerant species its do not match requirements classic shade-avoiding species.