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Atmospheric Carbon Dioxide Changes Photochemical Activity, Soluble Sugars and Volatile Levels in Broccoli (Brassica Oleracea Var. Italica)

Atmospheric Carbon Dioxide Changes Photochemical Activity, Soluble Sugars and Volatile Levels in Broccoli (Brassica Oleracea Var. Italica)

Angelika Krumbein, Hans-Peter Kläring, Ilona Schonhof, Monika Schreiner

J Agric Food Chem. 2010 Mar 24;58(6):3747-52.

PMID: 20158238

Abstract:

Atmospheric carbon dioxide (CO(2)) concentration is an environmental factor currently undergoing dramatic changes. The objective of the present study was to determine the effect of doubling the ambient CO(2) concentration on plant photochemistry as measured by photochemical quenching coefficient (qP), soluble sugars and volatiles in broccoli. Elevated CO(2) concentration increased qP values in leaves by up to 100% and 89% in heads, while glucose and sucrose in leaves increased by about 60%. Furthermore, in broccoli heads elevated CO(2) concentration induced approximately a 2-fold increase in concentrations of three fatty acid-derived C(7) aldehydes ((E)-2-heptenal, (E,Z)-2,4-heptadienal, (E,E)-2,4-heptadienal), two fatty acid-derived C(5) alcohols (1-penten-3-ol, (Z)-2-pentenol), and two amino acid-derived nitriles (phenyl propanenitrile, 3-methyl butanenitrile). In contrast, concentrations of the sulfur-containing compound 2-ethylthiophene and C(6) alcohol (E)-2-hexenol decreased. Finally, elevated CO(2) concentration increased soluble sugar concentrations due to enhanced photochemical activity in leaves and heads, which may account for the increased synthesis of volatiles.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP872559	2-Ethylthiophene		872-55-9	Price

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