title: Leaf turnover and growth responses of shade-grown saplings of four Shorea rain forest species to a sudden increase in light.
abstract: We tested the hypothesis that sapling growth following a sudden increase in solar irradiance is related to recovery from photoinhibition and the balance between rate of production of new leaves and rate of abscision of old leaves. Leaf gas exchange, chlorophyll fluorescence and relative growth rate (RGR) of stem basal area were measured following the sudden exposure of shade-grown (7% of full sunlight) saplings of four Shorea species to full sunlight. Sudden exposure to full sunlight resulted in an immediate and substantial reduction in dark-adapted quantum yield of photosystem II (Fv/Fm), followed by a gradual recovery in all species. Near light-saturated net assimilation rate (A max) and area-based leaf chlorophyll concentration ([Chl area]) also declined immediately after exposure. Eleven days after exposure, A max had recovered to pre-exposure values in all species, whereas [Chl area] had not recovered. Across species, RGR of stem basal area increased with increasing RGR of the number of leaves following exposure to full sunlight. The interspecific variations in RGR of stem basal area suggest that new leaf production is crucial for determining the potential growth of saplings following gap formation.
authors.affiliation: Graduate school of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan. michiru@fr.a.u-tokyo.ac.jp
authors.forename: Michiru
authors.initials: M
authors.lastname: Shimizu
authors.forename: Atsushi
authors.initials: A
authors.lastname: Ishida
authors.forename: Takeshi
authors.initials: T
authors.lastname: Tange
authors.forename: Hisayoshi
authors.initials: H
authors.lastname: Yagi
mesh_terms: D018533:Biomass; D002734:Chlorophyll / Q000378:metabolism; D008027:Light; D010788:Photosynthesis / Q000502:physiology / Q000528:radiation effects; D018515:Plant Leaves / Q000254:growth & development* / Q000378:metabolism / Q000502:physiology; D018547:Plant Stems / Q000254:growth & development / Q000378:metabolism / Q000502:physiology; D036226:Seedlings / Q000254:growth & development / Q000378:metabolism / Q000502:physiology; D013045:Species Specificity; D014197:Trees / Q000254:growth & development* / Q000378:metabolism / Q000502:physiology
chemical_list: D002734:Chlorophyll