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Integrating Transient Heterogeneity Of Non-Photochemical Quenching In Shade-Grown Heterobaric Leaves Of Avocado (Persea Americana L.): Responses To Co2 Concentration, Stomatal Occlusion, Dehydration And Relative Humidity, Kotaro Takayama, Diana King, Sharon A. Robinson, Barry Osmond
Integrating Transient Heterogeneity Of Non-Photochemical Quenching In Shade-Grown Heterobaric Leaves Of Avocado (Persea Americana L.): Responses To Co2 Concentration, Stomatal Occlusion, Dehydration And Relative Humidity, Kotaro Takayama, Diana King, Sharon A. Robinson, Barry Osmond
Sharon Robinson
Long-lived shade leaves of avocado had extremely low rates of photosynthesis. Gas exchange measurements of photosyn- thesis were of limited use, so we resorted to Chl fluorescence imaging (CFI) and spot measurements to evaluate photosyn- thetic electron transport rates (ETRs) and non-photochem- ical quenching (NPQ). Imaging revealed a remarkable transient heterogeneity of NPQ during photosynthetic in- duction in these hypostomatous, heterobaric leaves, but was adequately integrated by spot measurements, despite long-lasting artifacts from repeated saturating flashes during assays. Major veins (mid-vein, first- and second-order veins) defined areas of more static large-scale heterogeneous NPQ, with more dynamic small-scale heterogeneity most strongly …