Photosynthetica, 2011 (vol. 49), issue 2

Photosynthetica 2011, 49(2):316-320 | DOI: 10.1007/s11099-011-0035-x

Photosynthetic and growth responses of Camelina sativa (L.) Crantz to varying nitrogen and soil water status

X. Pan1, R. Lada1, C. D. Caldwell1,*, K. C. Falk2
1 Department of Plant and Animal Science, Nova Scotia Agricultural College, Truro, Canada
2 Agriculture and Agri-Food Canada, Saskatoon, Canada

Water and nitrogen (N) deficiency are two major constraints limiting the yield and quality of many oilseed crops worldwide. This study was designed to assess the response of Camelina sativa (L.) Crantz to the availability of N and water resources on photosynthesis and yield parameters. All the measured variables, which included plant height, root and shoot dry matter, root:shoot ratio, xylem pressure potential (XPP), yield components, photosynthetic parameters, and instantaneous water-use efficiency (WUE) were remarkably influenced by water and nitrogen supply. Net photosynthetic rate (P N) and yield components were significantly decreased more by water deficit than by N deficiency. XPP, stomatal conductance (g s), and intercellular CO2 concentration (C i) decreased substantially as the water deficit increased irrespective of the level of N application. WUE at the high N supply [100 and 150 kg(N) ha-1] dropped in a large degree as the increased water deficit due to a larger decrease in P N than transpiration rate (E). The results of this study suggest that the regulative capacity of N supply on photosynthetic and plant growth response is significantly affected by soil water status and C. sativa is more sensitive to water deficit than N supply.

Keywords: instantaneous water-use efficiency; net photosynthesis; nitrogen supply; seed yield; soil water status; transpiration rate

Received: January 21, 2010; Accepted: April 12, 2011; Published: June 1, 2011Show citation

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Pan, X., Lada, R., Caldwell, C.D., & Falk, K.C. (2011). Photosynthetic and growth responses of Camelina sativa (L.) Crantz to varying nitrogen and soil water status. Photosynthetica, 49(2), 316-320. doi: 10.1007/s11099-011-0035-x.
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