May have a role in the development of the transmitting tissue of the style and/or in the events related to pollination such as some aspect in the facilitation of compatible pollen tube growth. Eliminative cleavage of (1->4)-alpha-D-galacturonan to give oligosaccharides with 4-deoxy-alpha-D-galact-4-enuronosyl groups at their non-reducing ends. Binds 1 Ca(2+) ion. Required for its activity. Glycan metabolism; pectin degradation; 2-dehydro-3-deoxy-D-gluconate from pectin: step 2/5. Predominantly found in the pistil where it is found in the outer five layers of the strands of transmitting tissue within the upper two-thirds of the style. Found at much lower levels in the anthers and vegetative organs. Maximum levels are found during anthesis. Belongs to the polysaccharide lyase 1 family.