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We used an in vitro culture system to investigate the effects of three auxin polar transport inhibitors (9-hydroxyfluorene-9-carboxylic acid, trans-cinnamic acid, and 2,3,5-triiodobenzoic acid) on the development of early globular to heart-shaped stage embryos of Indian mustard (Brassica juncea) plants. Although the effective concentrations vary with the different inhibitors, all of them induced the formation of fused cotyledons in globular ([less than or equal to]60 [mu]m) but not heart-shaped embryos. Inhibitor-treated Brassica embryos phenocopy embryos of the Arabidopsis pin-formed mutant pin1-1, which has reduced auxin polar transport activity in inflorescence axes, as well as embryos of the Arabidopsis emb30 (gnom) mutant. These results indicate that the polar transport of auxin in early globular embryos is essential for the establishment of bilateral symmetry during plant embryogenesis. Based on these observations, we propose two possible models for the action of auxin during cotyledon formation.

Auxin Polar Transport Is Essential for the Establishment of Bilateral Symmetry during Early Plant Embryogenesis.