Supraoptimal Root-Zone Temperature Alters Growth and Photosynthesis of Holly and Elm

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Figure 1.
Effect of root-zone temperature on shoot extension of ‘East Palatka’ holly (1a) and ‘Drake’ elm (1b).
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Figure 2.
Effect of root-zone temperature on leaf carbon exchange rates and stomatal conductance of ‘East Palatka’ holly (2a& 2b) and ‘Drake’ elm (2c& 2d).

Table 1.

Effect of root-zone temperature on dry weights and shoot to root ratio (S/R) of East Palatka holly and Drake elm.

Temperature	Root (g)	Shoot (g)	S/R
holly
28°C	13.5	57.6	4.1
35°C	14.0	63.4	4.5
42°C	3.1	17.1	5.0
PR F	.0001 Q*	.0001 Q	.433
elm
28°C	34.5	65.6	1.8
35°C	26.4	40.2	1.5
42°C	5.8	13.0	2.2
PR F	.0001 Q	.0001 L	.079