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Temperature sensitivity of net photosynthesis (Pn) was evaluated among 4 taxa of rhododendron including  Rhododendron hyperythrum, R. russatum,  and plants from two populations (northern and southern provenances) of  R. catawbiense.  Measurements were conducted on individual leaves at temperatures ranging from 15 to 40C. Temperature optima for Pn ranged from a low of ∼21 C for  R. russatum  to a high of ∼27C for  R. hyperythrum.  At 40C, Pn rates for  R. hyperythrum, R. catawbiense  (northern provenance),  R. catawbiense  (southern provenance), and  R. russatum  were 7.8, 5.7, 3.5, and 0.2 μmol·m -2 ·s -1 , respectively.  R. catawbiense  from the southern provenance did not appear to have greater heat tolerance than plants from the northern provenance. There was no difference in temperature sensitivity of dark respiration among the taxa. Variations in heat tolerance among species appeared to result from a combination of stomatal and nonstomatal limitations on Pn at high temperatures.

195 PHYSIOLOGICAL STUDY OF HEAT TOLERANCE IN RHODODENDRON SPP.