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Alteration of transpiration rate, by changing air vapour pressure deficit, influences leaf extension rate transiently in Miscanthus

, : Alteration of transpiration rate, by changing air vapour pressure deficit, influences leaf extension rate transiently in Miscanthus. Journal of experimental botany 50(337): 1393-1401

A controlled environment chamber for whole plants is described in which vapour pressure deficit (VPD) and temperature can be controlled independently. Plant responses to changes in VPD at constant temperature were measured in terms of leaf extension and plant transpiration rates. Manipulation of VPD independently of temperature was shown to be capable of altering the leaf extension rates of the C(4) grass Miscanthus x giganteus grown in hydroponics. The effects of VPD on leaf extension are attributed to changes in transpiration rate and hence leaf water status. It was found that, at a temperature of 20 degrees C, the influence of a fixed change in VPD was proportionally less than those observed at temperatures which are close to the threshold for growth (between 6 and 10 degrees C). These responses are discussed in relation to our current understanding of the mechanisms of cell growth. The fact that the VPD effects on leaf expansion rates were largely transient suggest that simple models driven by temperature alone are adequate to predict leaf expansion within the temperature range 6-20 degrees C, for this genotype of Miscanthus, in the field.

Accession: 003035738

DOI: 10.1093/jxb/50.337.1393

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Related references

Clifton Brown, J.C.; Jones, M.B., 1998: Alteration in transpiration rate at constant temperature influences leaf expansion rate transiently in Miscanthus. Journal of Experimental Botany 49(SUPPL ): 6-7, May

Clifton Brown, J.C.; Jones, M.B., 1996: The influence of temperature and vapour pressure deficit on leaf extension in Miscanthus. Journal of Experimental Botany 47(SUPPL ): 44

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