Tomato (Lycopersicon esculentum Mill.) response to 36 flooding hours in two photoperiodic times
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Abstract
(Lycopersicon esculentum Mill) submitted to two flooding
cycles imposed at the beginning and at the end of the
photoperiod were studied under controlled conditions.
Flooding induced stomatal closure due to leaf desiccation
caused by the depression in water uptake by the roots as a
result of a lowered root permeability in both experiments. At
the beginning of flooding treatments there was an effective
negative hydraulic message from O2 deficient roots. However,
after that and during the recovery periods, there was an evident
delay in leaf conductance recovery with respect to leaf water
potential and leaf turgor potential, supporting the view that
chemical messages predominate. The abscence of a hydrostatic
pressure gradient when the flooding was imposed at the end
of photoperiod induced a more marked modification of plant
water relations.
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