Journal article

Authors list: Grüters, U

Publication year: 1999

Pages: 55-62

Journal: Journal of applied botany = Angewandte Botanik

Volume number: 73

Issue number: 1-2

ISSN: 0066-1759

Publisher: Blackwell

Abstract: 

Spring wheat (Triticum aestivum L. cv. Minaret) was exposed to 360 and 680 mu mol mol(-1) CO2 in open top chambers during the vegetation periods of 1994/1995.

In 1994 fractionated harvests were carried out at weekly intervals from the onset of stem elongation,. At final harvest CO, enhanced aboveground biomass and yield by 49.7 and 43.2%, respectively. From all plant organs stem dry weights showed the largest increases under doubled CO2, whereas leaf-blade dry weights increased only slightly. Since stems are known as sites of intermediary carbohydrate-storage, carbohydrate composition was analysed in the internodes of the main stem. Carbohydrates were determined as fructans, sucrose and reducing sugars. CO2 stimulated the amounts per organ of all components, but fructans showed the largest increases. Fructan accumulation lasted about one week longer and remobilisation was faster under elevated CO2. The results are consistent with current knowledge, that temporary storage pools accomodate source photosynthate supply to sink demand and suggested a predominant role of the intermediary stem reserves, when source-sink relations are changed under elevated CO2. The contribution of the main stem reserves to the main stem yield was also enhanced by elevated CO2 (6.1-8.7% compared to 10.0-14.2%). In 1995 growth and yield increase due to elevated CO2 (50.6 and 53%) was comparable to 1994. A functional growth analysis of the stem dry weight was carried out in this year. There was only a slightly longer accumulation phase in response to elevated CO2. Combined stem reserves contributed 12-18% to the final grain yield thereby contradicting, the suggestions based on the results of the year 1994.

Harvard Citation style: Grüters, U. (1999) On the role of wheat stem reserves when source-sink balance is disturbed by elevated CO2, Journal of applied botany = Angewandte Botanik, 73(1-2), pp. 55-62

APA Citation style: Grüters, U. (1999). On the role of wheat stem reserves when source-sink balance is disturbed by elevated CO2. Journal of applied botany = Angewandte Botanik. 73(1-2), 55-62.