The impact of desiccation on chlorophyll fluorescence in detached leaves of six tropical tree species
Authors: Newton, A.C. and McBeath, C.
Journal: Photosynthetica
Volume: 32
Issue: 4
Pages: 491-501
ISSN: 0300-3604
Abstract:Detached leaves of six tropical tree species were allowed to desiccate in a controlled environment (vapour pressure deficit 1.6 kPa; photon flux density 170 μmol m-2 s-1). Chlorophyll (Chl) fluorescence induction kinetics were measured in the intact leaves at regular intervals after excision, and related to the change in relative water content (RWC) with time. The Chl fluorescence ratio F(v)/F(m) declined with decreasing RWC in each species, with an initial gradual decline to RWCs between 40-60 %, followed by a more rapid decline to RWCs close to 0 %. The initial decline in F(v)/F(m) was markedly less pronounced in Anthocephalus chinensis than the other species tested. Although the fluorescence variables F(v), F(m) and t( 1/4 ) also tended to decline with decreasing RWC, values of F0 tended to increase with reductions of RWC down to approx. 50 %, and then declined rapidly. In the case of F0 and t( 1/4 ), the pattern of variation with time differed markedly between species, such that in A. chinensis, Terminalia brownii and Triplochiton scleroxylon, measurements taken after 15 and 480 min were not significantly different, in contrast to the other three species. These results indicate that all six species are sensitive to foliar desiccation to varying degrees. Overall, the degree of susceptibility to photochemical damage was unrelated to either leaf morphology or epidermal conductance.
Source: Scopus
The impact of desiccation on chlorophyll fluorescence in detached leaves of six tropical tree species
Authors: Newton, A.C. and McBeath, C.
Journal: PHOTOSYNTHETICA
Volume: 32
Issue: 4
Pages: 491-501
ISSN: 0300-3604
Source: Web of Science (Lite)
The impact of desiccation on chlorophyll fluorescence in detached leaves of six tropical tree species.
Authors: Newton, A. and McBeath, C.
Journal: Photosynthetica
Volume: 32
Pages: 491-501
ISSN: 0300-3604
Abstract:Detached leaves of six tropical tree species were allowed to desiccate in a controlled environment (vapour pressure deficit 1.6 kPa; photon flux density 170 μmol m-2 s-1). Chlorophyll (Chl) fluorescence induction kinetics were measured in the intact leaves at regular intervals after excision, and related to the change in relative water content (RWC) with time. The Chl fluorescence ratio F(v)/F(m) declined with decreasing RWC in each species, with an initial gradual decline to RWCs between 40-60 %, followed by a more rapid decline to RWCs close to 0 %. The initial decline in F(v)/F(m) was markedly less pronounced in Anthocephalus chinensis than the other species tested. Although the fluorescence variables F(v), F(m) and t( 1/4 ) also tended to decline with decreasing RWC, values of F0 tended to increase with reductions of RWC down to approx. 50 %, and then declined rapidly. In the case of F0 and t( 1/4 ), the pattern of variation with time differed markedly between species, such that in A. chinensis, Terminalia brownii and Triplochiton scleroxylon, measurements taken after 15 and 480 min were not significantly different, in contrast to the other three species. These results indicate that all six species are sensitive to foliar desiccation to varying degrees. Overall, the degree of susceptibility to photochemical damage was unrelated to either leaf morphology or epidermal conductance.
Source: Manual
Preferred by: Adrian Newton