Photosynthetica, 2008 (vol. 46), issue 1

Photosynthetica 2008, 46(1):63 | DOI: 10.1007/s11099-008-0012-1

Differences in photosynthetic apparatus of leaves from different sides of the chestnut canopy

J. Gomes-Laranjo1,*, J. P. Coutinho1, V. Galhano1, J. V. Ferreira-Cardoso1
1 Centre for Research and Technology of Agro-Environment and Biological Sciences, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal

In crowns of chestnut trees the absorption of radiant energy is not homogeneous; leaves from the south (S) side are the most irradiated, but leaves from the east (E) and west (W) sides receive around 70 % and those from north (N) face less than 20 % of the S irradiation. Compared to the S leaves, those from the N side were 10 % smaller, their stomata density was 14 % smaller, and their laminae were 21 % thinner. N leaves had 0.63 g(Chl) m-2, corresponding to 93 % of total chlorophyll (Chl) amount in leaves of S side. The ratios of Chl a/b were 2.9 and 3.1 and of Chl/carotenoids (Car) 5.2 and 4.8, respectively, in N and S leaves. Net photosynthetic rate (P N) was 3.9 µmol(CO2) m-2 s-1 in S leaves, in the E, W, and N leaves 81, 77, and 38 % of that value, respectively. Morning time (10:00 h) was the period of highest P N in the whole crown, followed by 13:00 h (85 % of S) and 16:00 h with 59 %. Below 500 µmol m-2 s-1 of photosynthetic photon flux density (PPFD), N leaves produced the highest P N, while at higher PPFD, the S leaves were most active. In addition, the fruits from S side were 10 % larger than those from the N side.

Keywords: 9-amino-6-chloro-2-methoxyacridine; carotenoids; Castanea sativa; chlorophyll; chloroplasts; fruit; gas exchange; shade and sun leaves; water relations

Received: April 13, 2007; Accepted: July 26, 2007; Published: March 1, 2008Show citation

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Gomes-Laranjo, J., Coutinho, J.P., Galhano, V., & Ferreira-Cardoso, J.V. (2008). Differences in photosynthetic apparatus of leaves from different sides of the chestnut canopy. Photosynthetica, 46(1), 63. doi: 10.1007/s11099-008-0012-1.
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