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Journal of Experimental Botany, Vol. 53, No. 375, pp. 1771-1779, August 1, 2002
© 2002 Oxford University Press

Estimation of whole-plant transpiration of bananas using sap flow measurements

Received 5 September 2001; Accepted 15 April 2002

Ping Lu3,1, Kam-Chau Woo2 and Zhu-Tian Liu2

1 CSIRO Plant Industry, Darwin Laboratory, PMB44, Winnellie, NT 0822, Australia
2 Faculty of SITE, Northern Territory University, Darwin, NT 0909, Australia

3 To whom correspondence should be addressed. Fax: +61 8 89470052. E-mail: ping.lu{at}csiro.au

Banana, one of the largest rhizomatous herbs in the world, is the fourth most important global food crop. It has a high water requirement, but the whole-plant water use in the field has not been determined satisfactorily. In this study, whole-plant water use in potted and field-grown banana plants (Musa ‘Cavendish’ cv. Williams) was successfully determined using a xylem sap flow method. This was achieved using Granier sensor probes implanted into the central cylinder of the banana corm. The whole-plant water use in field-grown bananas was 9–10 l plant–1 d–1. The values of daily total sap flow in potted plants correlated closely with gravimetric measurements (r2=0.92) and with changes in soil water status (r2=0.77). In well-watered, mature, field-grown plants, hourly sap flow also closely correlated with changes in solar radiation, vapour pressure deficit and evapotranspiration. The study indicates that sap flow measurement is a sensitive and accurate method for determining whole-plant water use in bananas under potted as well as field conditions.

Key words: Key words: Banana, corm, Musa, sap flow, water deficit, whole-plant water use.


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