TY - JOUR
T1 - The potential for photoinhibition of Pinus sylvestris L. seedlings exposed to high light and low soil temperature
AU - Delucia, Evan H.
AU - Day, Thomas A.
AU - Oquist, Gunnar
N1 - Funding Information:
ACKNOWLEDGEMENTS We thank GunilJa Malmberg and Paavo Lundberg for logistical assistance and Scott Heckathorn for doing the gas exchange and water potential measurements of Pinus engelmannii and Pinus taeda. This research was funded in part by a USDA-CRGO (Forest Biology) grant to E.H.D. and W.K. Smith. Overseas travel for E.H.D. was provided by the Scandinavian-American Foundation, NY, USA. Additional funding was provided by the Swedish Natural Research Council.
PY - 1991/5
Y1 - 1991/5
N2 - The effect of high light and root chilling on gas exchange, chlorophyll fluorescence, and bulk shoot water potential (φshoot) was examined for Pinus sylvestris seedlings. Transferring plants from low light (200 μmol m-2s-1, PAR) and a soil temperature of 15 °C to high light (850 μmol m-2 s-1) and 1 °C caused >90% decrease in net photosynthesis and leaf conductance measured at 350 mm3 dm-3 CO2, and a decrease in the ratio of variable to maximum fluorescence (Fv/Fm) from 0.83 to 0.63. The decrease in Fv/Fm was, however, only marginally greater than when seedlings were transferred from low to high light but kept at a soil temperature of 15 °C. Thus, photoinhibition was a minor component of the substantial decrease observed for net photosynthesis at 1 °C soil temperature. The decrease in net photosynthesis and φshoot at 1 °C was associated with an increase in calculated intracellular CO2 concentration, suggesting that non-stomatal factors related to water stress were involved in inhibiting carbon assimilation. Measurements at saturating external CO2 concentration, however, indicate that stomatal closure was the dominant factor limiting net photosynthesis at low soil temperature. This interpretation was confirmed with additional experiments using Pinus taeda and Picea engelmannii seedlings. Decreases in gas-exchange variables at 5 °C soil temperature were not associated with changes in φshoot Thus, hormonal factors, localized decreases in φneedles or changes in xylem flux may mediate the response to moderate root chilling.
AB - The effect of high light and root chilling on gas exchange, chlorophyll fluorescence, and bulk shoot water potential (φshoot) was examined for Pinus sylvestris seedlings. Transferring plants from low light (200 μmol m-2s-1, PAR) and a soil temperature of 15 °C to high light (850 μmol m-2 s-1) and 1 °C caused >90% decrease in net photosynthesis and leaf conductance measured at 350 mm3 dm-3 CO2, and a decrease in the ratio of variable to maximum fluorescence (Fv/Fm) from 0.83 to 0.63. The decrease in Fv/Fm was, however, only marginally greater than when seedlings were transferred from low to high light but kept at a soil temperature of 15 °C. Thus, photoinhibition was a minor component of the substantial decrease observed for net photosynthesis at 1 °C soil temperature. The decrease in net photosynthesis and φshoot at 1 °C was associated with an increase in calculated intracellular CO2 concentration, suggesting that non-stomatal factors related to water stress were involved in inhibiting carbon assimilation. Measurements at saturating external CO2 concentration, however, indicate that stomatal closure was the dominant factor limiting net photosynthesis at low soil temperature. This interpretation was confirmed with additional experiments using Pinus taeda and Picea engelmannii seedlings. Decreases in gas-exchange variables at 5 °C soil temperature were not associated with changes in φshoot Thus, hormonal factors, localized decreases in φneedles or changes in xylem flux may mediate the response to moderate root chilling.
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U2 - 10.1093/jxb/42.5.611
DO - 10.1093/jxb/42.5.611
M3 - Article
AN - SCOPUS:0001067292
SN - 0022-0957
VL - 42
SP - 611
EP - 617
JO - Journal of experimental botany
JF - Journal of experimental botany
IS - 5
ER -