Table 2.

Significance of linear and second order regressions between soil and plant variables

Relationship	Irrigation	Linear	2nd order
Transpiration rate on whole pot soil water content	Combined	0.33	0.003
Transpiration rate on leaf water potential	Combined	0.07	0.09
Transpiration rate on [X-ABA]leaf	Combined	<0.001	0.003
[X-ABA]leaf on leaf water potential	PRD	0.038	0.016
	DI	0.002	<0.001
[X-ABA]leaf on whole pot soil water content	Combined	0.001	<0.001

P values are presented for three distinct data sets: all PRD plants or all DI plants where irrigation treatment by x-variable interaction was significant (P <0.05). Alternatively, a combined data set (including both PRD and DI plants) was analysed where the irrigation treatment by x-variable interaction was not significant.