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SEM analysis of anther morphology and pollen adhesion from flowers of WT (A), the double mutant (B,E) and the transheterozygote pdi9-1/pdi9-2 hybrid mutant (C,D,F) in the control (C) and heat stress treatments (A,B,D-F). Scale bars are 100 mm (A–D), 10 mm (E), and 30 mm (F). Diamond arrows indicate tapetum cells (C,D) and regular arrows indicate points of pollen adhesion (F).
