Analysis of the gas exchange components in chilled tomato plants |
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Authors: | D Chouj HM Kalaji and B Niemyska |
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Institution: | (1) Department of Plant Physiology, Warsaw Agricultural University, Rakowiecka 26/30, 02-528 Warsaw, Poland |
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Abstract: | A positive linear relationship between the net CO2 exchange rate (P
N) and the leaf stomatal conductance (gs) under an optimal temperature, and even more distinct one after a short-term chilling (CH, 15-17 h, 2 °C in darkness), that
was found in two tomato cultivars (sensitive to a low temperature cv. Robin and tolerant cv. New Yorker) suggested a partial
stomatal limitation of photosynthesis. The CH treatment of cv. Robin resulted in an intercellular CO2 concentration (C
i) increase because of which a negative correlation between C
i and P
N was observed. In cv. New Yorker a positive correlation was observed. Detrimental effect of the low temperature in cv. Robin
was more evident in plants with a relatively small root system (SR), but drought-hardening positively affected the response
to CH only in the plants with bigger roots (BR). On the contrary, in cv. New Yorker the favourable effect of such pre-treatment
was more evident in SR than in BR plants.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | drought acclimation intercellular CO2 concentration low temperature stress Lycopersicon esculentum net photosynthetic rate stomatal conductance |
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