Cell wall remodeling in Arabidopsis stamen abscission zones

Figures & data

Figure 1 Developmental expression profiles of cell wall related genes within AZ₁₄₆₁. Transcripts were subjected to divisive hierarchical clustering. Enzyme families are further described on the Carbohydrate-Active Enzymes website (www.cazy.org) described by Coutinho et al.9 Floral stage numbers are defined elsewhere2 and in Figure 2. EXP expansin, EXPL expansin-like, GH9 glycosyl hydrolase family 9, GH17 glycosyl hydrolase family 17, PAE pectin acetylesterase, PG polygalacturonase, PL pectate lyase, PME pectin methylesterase, PMEI pectin methylesterase inhibitor protein, RGL rhamnogalacturonan lyase, XTH xyloglucan endotranglucosylase/hydrolase.

Figure 2 Model of floral stages at which abscission subfunctions may take place. Floral stage numbers are further defined elsewhere.2 Abscission signal receipt is expected to take place before anthesis because abscission regulators have accumulated by S12.2 These include the HAESA receptor kinase13 and multiple ethylene response factors.2 Signaling at or beyond anthesis is evidenced by accumulation at S13 of IDA ligand transcript required for abscission.14 Evidence that a subset of stamen AZ cells have completely separated by S15c is provided in Cai and Lashbrook.2 GH9 is Glycosyl Hydrolase Family 9; GH7 is Glycosyl Hydrolase Family 17.

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