ISHS Acta Horticulturae 171: I International Symposium on Water Relations in Fruit Crops
LEAF WATER POTENTIAL, STOMATAL RESISTANCE AND TRANSPIRATION RESPONSE TO DIFFERENT WATERING IN ALMOND, PEACH AND "PIXY" PLUM. |
| Author: | S. Dettori |
| Abstract:
Total leaf water potential, stomatal resistance and transpiration rate per unit leaf area were measured in open pollinated seedlings of almond, peach and in micropropagated Pixy plum maintained in a growth chamber at 90, 60 and 30%, of available water on dry weight basis. Total leaf water potential (  w) decreased from -0.9 to -1.1 and 2.3, and from -1.1 to -1.2 and -2.0 MPa for peach and almond respectively at 90, 60 and 30% of available water.
Pixy plum w fell from -1.4 to -1.5 MPa when soil moisture decreased from 90 to 60%, while the trees did not survive at 30%. Stomatal conductance decreased from 2.9 to 1.7 and 1.1, and from 5.6 to 3.6 and 2.3, and 2.6 to 2.2 mm/sec for peach, almond and plum respectively at 90, 60 and 30% of available water.
Transpiration rate per unit leaf area decreased from 16.5 to 12.3 and 4.1, and from 26.8 to 15.0 and 10.8, and from 25.7 to 14.6 g/h/m2 for peach, almond and plum respectively at 90, 60 and 30% of available water.
While a linear relationship between stomatal conductance and w was observed for peach and almond, Pixy plum showed a relatively large transpiration rate and poor resistance to drought conditions.
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