NDLI: Photosynthetic response of wheat and sunflower cultivars to long-term exposure of elevated carbon dioxide concentration

Content Provider	Springer Nature Link
Author	Pandurangam, V. Sharma Natu, P. Sreekanth, B. Ghildiyal, M.C.
Copyright Year	2006
Abstract	Wheat (Triticum aestivum L. cv. HD 2329 and DL 1266-5) and sunflower (Helianthus annuus L. cv. MSFH 17 and MRSF 1754) plants were grown in field under atmospheric (360±10 cm$^{3}$ m$^{−3}$, AC) and elevated (650±50 cm$^{3}$ m$^{−3}$, EC) CO$_{2}$ concentrations in open top chambers for entire period of growth and development till maturity. Net photosynthetic rate (P $_{N}$) of wheat cvs. when compared at the same internal CO$_{2}$ concentration (C $_{i}$), by generating P $_{N}$/C $_{i}$ curves, showed lower P $_{N}$ in EC plants than in AC ones. EC-grown wheat cultivars also showed a lesser response to irradiance than AC plants. In sunflower cultivars, P $_{N}$/C $_{i}$ curves and irradiance response curves were not significantly different in AC and EC plants. CO$_{2}$ and irradiance responses of photosynthesis, therefore, further revealed a down-regulation of $_{P}$ $_{N}$ in wheat but not so in sunflower under long-term CO$_{2}$ enrichment. Wheat cvs. accumulated in leaves mostly sugars, whereas sunflower accumulated mainly starch. This further strengthened the view that accumulation of excess assimilates in the leaves under EC as starch is not inhibitory to $_{P}$ $_{N}$.
Starting Page	586
Ending Page	590
Page Count	5
File Format	PDF
ISSN	03003604
Journal	Photosynthetica
Volume Number	44
Issue Number	4
e-ISSN	15739058
Language	English
Publisher	Kluwer Academic Publishers-Consultants Bureau
Publisher Date	2006-01-01
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science

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