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Stomatal and non-stomatal limitations to photosynthesis were determined for both primocanes and floricanes of “Titan” red raspberry. Limitations to photosynthesis were determined from the relationships between rates of photosynthesis  (A),  stomatal conductance  (g),  and the internal CO, concentration  (Ci)  of the leaf. We generated this data  (A, g  and  Ci)  using steady state gas exchange. Calculation of limitations were determined from  A/Ci  and  A/g  curves, second order polynomial regression and computer simulation. Using methods developed by Farquhar &amp; Sharkey (1982), stomatal limitation during and after fruiting in both primocane and floricane leaves was approximately 28%. Non-stomatal limitations were determined through computer modeling and expressed as the maximum rates of carboxylation,  Vc max  , and of electron transpont,  J max  .

117 AN ANALYSIS OF STOMATAL v. NON-STOMATAL LIMITATIONS TO PHOTOSYNTHESIS IN RED RASPBERRY