Susceptibility to photoinhibition of three deciduous broadleaf tree species with different successional traits raised under various light regimes

• DOI: 10.1046/j.1365-3040.2000.00528.x
• Publication Date: 2003-03-12T16:22:05Z
• Authors: M. Kitao; T. T. Lei; T. Koike; H. Tobita; Y. Maruyama
• Keywords: Photoinhibition; Shade tolerance

ABSTRACT The susceptibility to photoinhibition of tree species from three different successional stages were examined using chlorophyll fluorescence and gas exchange techniques. deciduous broadleaf Betula platyphylla var. japonica , pioneer early successional, Quercus mongolica intermediate shade‐tolerant mid‐successional, Acer mono late successional. Tree seedlings raised under light regimes: full sunlight (open), 10% sun, 5% sun. Susceptibility was assessed on the basis recovery kinetics ratio vaviable maximum ( F v / m ) detached leaf discs exposed about 2000 μ mol −1 s photon flux density (PFD) for 2 h controlled conditions (25 28 °C, fully hydrated). Differences in photodamage among not significant open sun treatments. But B. sustained a significantly greater than other species, probably associated with having lowest photosynthetic capacity indicated by light‐saturated rate 9·87, 5·85 2·82; Q. 8·05, 6·28 4·41; A. 7·93, 6·11 5·08 CO open, respectively). To simulate gap formation assess its complex effects including high temperature water stress addition strong photoinhibition, we field means monitoring Δ ′ first day transfer natural daylight. Compared AM, lower PM responding PFD following around noon that occurred plants grown 10 diurnal changes ΔF showed less susceptible although they little differences both intact leaves based disc measurements. These results suggest shade‐grown had higher tolerance additional stresses such as field, possibly due their plasticity anatomy low environment.