ISHS Acta Horticulturae 374: III International Peach Symposium
EFFECTS OF MILD WATER STRESS ON CO2 ASSIMILATION AND WATER USE EFFICIENCY OF FIELD-GROWN PEACH TREES |
| Authors: | L. Cheng, S. Cheng, H. Shu, X. Luo |
| Keywords: | peach, irrigation, water stress |
| Abstract:
Six-year-old peach trees cv. Okubo were subjected to mild soil drought at soil water potential 80 KPa (at 25 cm depth) 22 days after irrigation, with the controls at 27 KPa. Water stress significantly decreased leaf stomatal conductance (Gs) and transpiration rate without affecting CO2 assimilation rate (A), thus increasing water use efficiency throughout the day. Leaf water potential of the stressed plants was 0.2–0.3 MPa lower than that of the controls from noon on. There was a hyperbolic relationship between A (mmol·m-2·s-1) and Gs (mo1·m-2·s-1) over a wide range of experimental data, A=100Gs/(0.6192+3.7426Gs)-4.0 (R2=0.9549, n=210), which suggested that peach trees can respond to water availability in the soil sensitively to optimize water use efficiency. | |
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