Antioxidant Levels Decrease in Primary Leaves of Barley during Growth at Ambient and Elevated Carbon Dioxide Levels

Autor:	Richard C. Sicher, J. Michael Robinson
Rok vydání:	2004
Předmět:	Antioxidant Sucrose medicine.medical_treatment fungi RuBisCO food and beverages Plant Science Biology Photosynthesis Ascorbic acid chemistry.chemical_compound chemistry Chlorophyll Botany Carbon dioxide medicine biology.protein Hordeum vulgare Ecology Evolution Behavior and Systematics
Zdroj:	International Journal of Plant Sciences. 165:965-972
ISSN:	1537-5315 1058-5893
DOI:	10.1086/423867
Popis:	Previous studies revealed that the primary leaves of barley (Hordeum vulgare L. cv. Brant) that were grown in high‐light growth chambers in elevated CO2 (100 Pa) developed symptoms of senescence earlier than primary leaves of barley plants concurrently grown in ambient CO2 (36 Pa). The onset of senescence in these leaves was hypothesized to be associated with a decline in antioxidant capacity that resulted in higher levels of active oxygen species, which caused oxidative stress. In this new study, barley was grown from planting in high‐light growth chambers supplied with either ambient CO2 (36 Pa) or elevated CO2 (100 Pa). From 9 to 17 d after planting (DAP), primary leaf chlorophyll level as well as photosynthetic oxygen evolution per unit fresh mass decreased in plants in elevated CO2 to a greater extent than in plants in ambient CO2. Exposure of plants to elevated CO2 resulted in higher levels of primary leaf–free glucose, sucrose, and starch than in plants concurrently exposed to ambient CO2; this was...
Databáze:	OpenAIRE
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