A Model for the Interaction of Low Temperature, ABA, IAA, and CO2 in the Control of Stomatal Behaviour |
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Authors: | EAMUS D; WILSON J M |
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Abstract: | In the chilling sensitive (C.S.) species Phaseolus vulgarisit was found that at 22 ?C ABA induced stomatal closure butthis effect was dependent on the presence of CO2. In the absenceof CO2 the effect of ABA was completely lost. In contrast toABA, the effect of IAA at 22 ?C was to increase stomatal openingas the IAA concentration increased from 102 to 10 molm3, and this effect was dependent upon the presence ofCO2. However, at 5 ?C the action of ABA was reversed and itwas found to induce stomatal opening when fed via the transpirationstream in excised leaves. Similarly, the CO2 response characteristicswere reversed at low temperatures as removal of CO2 from theatmosphere caused stomatal closure. However, the effect of IAAat 5 ?C in the presence of CO2 and with or without ABA was toincrease stomatal aperture with increasing IAA concentration.Significantly, ABA was found to have no effect upon aperturein the presence of CO2 when IAA was added. The interactive effectsof ABA, IAA, CO2 and low temperature are discussed in relationto a model proposed by the authors. Key words: IAA, ABA, CO2, Stomata |
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