Abstract
SummaryTemperature effects on photosynthesis, transpiration and stomatal resistance were studied in two greenhouse-grown tomato cvs under temperature regimes with maxima of 25° and 35°C. The cvs were Roma VF, which has low fruit set under high temperatures, and Saladette, with high fruit set under such conditions. Transpiration at noon under a high temperature after 48 h acclimatigation was 400% higher than under a moderate temperature, Saladette transpiring slightly less than Roma VF. Stomatal resistance reached a minimum at noon, in accordance with transpiration rate. Leaf water potential (ΨL) reached minima of –1.01 and –0.72 MPa at noon under high and moderate temperatures, respectively. There was no significant difference in Ψ between the cvs. Photosynthesis reached a maximum at 10.00 a.m., with no difference between the cvs. The physiological responses of the two cvs are discussed in relation to fruit set.
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