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Effect of season on the transpiration of Sonia rose leaves grown in rockwool at 2 different levels of electrical conductivity and relative humidity



Effect of season on the transpiration of Sonia rose leaves grown in rockwool at 2 different levels of electrical conductivity and relative humidity



Agronomie (Paris) 14(2): 103-111



Rose plants (Rosa hybrida cv. Sonia) were grown in rockwool in 2 heated greenhouses: 1 control (referred as the low relative humidity (RH) greenhouse) and 1 with RH control (high RH greenhouse). Two electrical conductivity (EC, expressing salinity) rates were applied: high (EC of drainage water around 3.8 mS cm-1), and low (EC of drainage water around 1.8 mS cm-1). In both cases, the drainage rate was kept above 40% of the supplied water. The water potential at stomatal closure (psi-fer) and the cuticular transpiration rate (E-cut) were measured throughout the season on phenologically identical leaves. psi-fer was not affected by RH or EC. It increased from spring to early fall, recovering partly from early fall to winter. These variations do not seem to result from a water stress adaptative process or ontogenetic changes taking place in the leaves. E-cut decreased dramatically in early fall. It was the lowest in the low RH greenhouse. These differences and fluctuations are discussed.

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Accession: 002604271

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