Photosynthetic induction in leaves of co-occurring Fagus lucida and Castanopsis lamontii saplings grown in contrasting light environments

摘要: Photosynthetic induction times and photoinhibition in relation to simulated sunflecks (sudden increase of irradiance from 20 1,500 μmol m−2 s−1) were examined leaves co-occurring Fagus lucida (a deciduous tree) Castanopsis lamontii (an evergreen saplings grown either a beech forest understory or an adjacent open site during late rainy season. Two hypotheses tested: (1) would display faster photosynthetic greater than open-grown leaves; (2) species have slower lighter species. Times reach 90% maximal CO2 assimilation rate (t 90%A ) stomatal conductance $$ (t_{{90\% g_{{\text{s}}} }}) $$ did not differ between species, but showed by 3–5 min due higher initial (g s initial) state 1 min into (IS1min) the former. Our analysis across published data on 48 broad-leaved woody again revealed negative correlations t g s IS1min, similarity t_{{90\% }} Measurements maximum PSII photochemical efficiency (F v/F m) indicated that occurred any growth habitats sunfleck-induced induction. Despite no interspecific differences degree photoinhibition, both suffered heavier leaves, as stronger decrease F m Dynamic changes quantum yields photochemistry ΔpH- xanthophyll-regulated thermal dissipation adjustments partitioning electron flow assimilative non-assimilative processes functional resist photoinhibition. However, such together with biochemical limitations, carbon gain sunflecks, particularly leaves.