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PHOTOSYNTHESIS AND ...
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LEVERENZ, JW
(författare)
PHOTOSYNTHESIS AND PHOTOINHIBITION IN LEAVES OF CHLOROPHYLL-B-LESS BARLEY IN RELATION TO ABSORBED LIGHT
- Artikel/kapitelEngelska1992
Förlag, utgivningsår, omfång ...
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Wiley,1992
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LIBRIS-ID:oai:DiVA.org:umu-46876
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https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-46876URI
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https://doi.org/10.1111/j.1399-3054.1992.tb05817.xDOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
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The response of photosynthesis to absorbed light by intact leaves of wild-type (Hordeum vulgare L. cv. Gunilla) and chlorophyll b-less barley (H. vulgare L. cv. Dornaria, chlorina-f2(2800)) was measured in a light integrating sphere. Up to the section where the light response curve bends most sharply the responses of the b-less and wild-type barley were similar but not identical. Average quantum yield and convexity for the mutant light response curves were 0.89 and 0.90, respectively times those of the wild-type barley. The maximum quantum yield for PSII photochemistry was also 10% lower as indicated by fluorescence induction kinetics (F(v)/F(m)). Just above the region where the light curve bends most sharply, photosynthesis decreased with time in thc mutant but not in the wild-type barley. This decrease was associated with a decrease in F(v)/F(m) indicating photoinhibition of PSII. This photoinhibition occurred in the same region of the light response curve where zeaxanthin formation occurs. Zeaxanthin formation occurred in both the chlorophyll b-less and wild-type leaves. However, the epoxidation state was lower in the mutant than in the wild-type barley. The results indicate that chlorophyll b-less mutants will have reduced photosynthetic production as a result of an increased sensitivity to photoinhibition and possibly a lowered quantum yield and convexity in the absence of photoinhibition.
Biuppslag (personer, institutioner, konferenser, titlar ...)
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Oquist, Gunnar,1941-Umeå universitet,Institutionen för fysiologisk botanik,Umeå Plant Science Centre (UPSC)(Swepub:umu)guoq0001
(författare)
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WINGSLE, G
(författare)
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Umeå universitetInstitutionen för fysiologisk botanik
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Physiologia Plantarum: Wiley85:3, s. 495-5020031-93171399-3054
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