Photosynthetica 2007, 45(1):43-50 | DOI: 10.1007/s11099-007-0007-3

Intrinsic changes in photosynthetic parameters of carrot leaves under increasing CO2 concentrations and soil moisture regimes

A. Thiagarajan1, R. R. Lada1,*
1 Department of Plant and Animal Sciences, Nova Scotia Agricultural College, Truro, Canada

A controlled growth chamber experiment was conducted to investigate the short-term water use and photosynthetic responses of 30-d-old carrot seedlings to the combined effects of CO2 concentration (50-1 050 µmol mol-1) and moisture deficits (-5, -30, -55, and -70 kPa). The photosynthetic response data was fitted to a non-rectangular hyperbola model. The estimated parameters were compared for effects of moisture deficit and elevated CO2 concentration (EC). The carboxylation efficiency (α) increased in response to mild moisture stress (-30 kPa) under EC when compared to the unstressed control. However, moderate (-55 kPa) and extreme (-70 kPa) moisture deficits reduced α under EC. Maximum net photosynthetic rate (P Nmax) did not differ between mild water deficit and unstressed controls under EC. Moderate and extreme moisture deficits reduced P Nmax by nearly 85 % compared to controls. Dark respiration rate (R D) showed no consistent response to moisture deficit. The CO2 compensation concentration (Γ) was 324 µmol mol-1 for -75 kPa and ranged 63-93 µmol mol-1 for other moisture regimes. Interaction between moisture deficit and EC was noticed for P N, ratio of intercellular and ambient CO2 concentration (C i/C a), stomatal conductance (g s ), and transpiration rate (E). P N was maximum and C i/C a was minimum at -30 kPa moisture deficit and at C a of 350 µmol mol-1. The g s and E showed an inverse relationship at all moisture deficit regimes and EC. Water use efficiency (WUE) increased with moisture deficit up to -55 kPa and declined thereafter. EC showed a positive influence towards sustaining P N and increasing WUE only under mild moisture stress, and no beneficial effects of EC were noticed at moderate or extreme moisture deficits.

Additional key words: Daucus carota; model; stomatal conductance; transpiration; water use efficiency

Received: March 24, 2006; Accepted: July 19, 2006; Published: March 1, 2007  Show citation

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Thiagarajan, A., & Lada, R.R. (2007). Intrinsic changes in photosynthetic parameters of carrot leaves under increasing CO2 concentrations and soil moisture regimes. Photosynthetica, 45(1), 43-50. doi: 10.1007/s11099-007-0007-3
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