Abstract
Plants ofPlectranthus fructicosus were grown in two controlled environments -“spring” and “summer” conditions - differing in temperature and air humidity (day/night 20/15 and 27/22 °C; 80/98 and 50/80 % relative humidity) in order to study the influence of environmental conditions on the development of photosynthetic characteristics of individual leaves. The contribution of individual leaves to plant photosynthesis was very similar in both environments, the maximum shifting from bottom leaves to leaves of middle insertion levels during plant ontogenesis. On integrating the values of leaf photosynthesis for the whole vegetation period, the 5th leaf in “spring” conditions and the 4th leaf in “summer” conditions showed the highest contribution to plant photosynthesis (29 % resp. 25% of total net CO2 influx). The “photosynthetically mature” leaves of middle insertion levels played the main role in CO2 uptake of whole plant.
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Tichá, I. Der Beitrag einzelner Blätter an der Pflanze zur Photosynthese des gesamten Blattapparates im Laufe der Pflanzenentwicklung. Biol Plant 18, 237–240 (1976). https://doi.org/10.1007/BF02922816
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DOI: https://doi.org/10.1007/BF02922816