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Morphological characterization of embryos and developing seeds of yellow-seeded oil-type genotype yellow sarson (YS143), and black/brown-seeded vegetable-type genotype pak choi (PC175) of Brassica rapa . Developing seeds represent different developmental stages after fertilization to seed maturity. Seed developmental stages are: S0: fertilization; S1: pre-globular; S2: globular; S3: heart; S4: torpedo; S5: linear cotyledon; S6: bent-cotyledon; S7: embryo fully fills seed.
