Photosynthesis under osmotic stress View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1981-12

AUTHORS

Werner M. Kaiser, Georg Kaiser, Silvia Schöner, Spidola Neimanis

ABSTRACT

The reversibility of the inhibition of photosynthetic reactions by water stress was examined with four systems of increasing complexity—stromal enzymes, intact chloroplasts, mesophyll protoplasts, and leaf slices. The inhibition of soluble chloroplast enzymes by high solute concentrations was instantly relieved when solutes were properly diluted. In contrast, photosynthesis was not restored but actually more inhibited when isolated chloroplasts exposed to hypertonic stress were transferred to conditions optimal for photosynthesis of unstressed chloroplasts. Upon transfer, chloroplast volumes increased beyond the volumes of unstressed chloroplasts, and partial envelope rupture occurred. In protoplasts and leaf slices, considerable and rapid, but incomplete restoration of photosynthesis was observed during transfer from hypertonic to isotonic conditions. Chloroplast envelopes did not rupture in situ during water uptake. It is concluded that inhibition of photosynthesis by severe water stress is at the biochemical level brought about in part by reversible inhibition of chloroplast enzymes and in part by membrane damage which requires repair mechanisms for reversibility. Both soluble enzymes and membranes appear to be affected by the increased concentration of internal solutes, which is caused by dehydration. More... »

PAGES

430-435

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00394981

DOI

http://dx.doi.org/10.1007/bf00394981

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1005916646

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/24275812


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