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Embryo sac morphologies in bsl1/+ plants. (A) Wild-type embryo sac with the two central cell polar nuclei centrally located above the egg cell. (B) bsl1 mutant embryo sac with the polar nuclei located adjacent to the abgerminal wall of the central cell. (C) bsl1 mutant embryo sac showing polar nuclei situated off center, abgerminal to the central longitudinal axis. Arrowheads point to the polar nuclei. an, antipodals; cv, central vacuole; e, egg cell; nu, nucellus. Bar, 25 μm.
