Effects of drought on photosynthesis, chlorophyll fluorescence and photoinhibition susceptibility in intact willow leaves View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1985-11

AUTHORS

E. Ögren, G. Öquist

ABSTRACT

Plants from clonal cuttings of Salix sp. were subjected to a drying cycle of 10 d in a controlled environment. Gas exchange and fluorescence emission were measured on attached leaves. The light-saturated photosynthetic CO2 uptake became progressively inhibited with decreased leaf water potential both at high, and especially, at low intercellular CO2 pressure. The maximal quantum yield of CO2 uptake was more resistant. The inhibition of light-saturated CO2 uptake at leaf water potentials around-10 bar, measured at a natural ambient CO2 concentration, was equally attributable to stomatal and non-stomatal factors, but the further inhibition below this water-stress level was caused solely by non-stomatal factors. The kinetics of fluorescence emission was changed at severe water stress; the slow secondary oscillations of the induction curve were attenuated, and this probably indicates perturbations in the carbon reduction cycle. The influence of light level during the drought period was also studied. Provided the leaves were properly light-acclimated, drought at high and low light levels produced essentially the same effects on photosynthesis. However, low-light-acclimated leaves became more susceptible to photoinhibitory treatment under severe water stress, as compared with well-watered conditions. More... »

PAGES

380-388

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00401176

DOI

http://dx.doi.org/10.1007/bf00401176

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1004130634

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/24241521


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