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Fig. 3. (a). Unfertilized ovary from tetraploid switchgrass parent (left); caryopsis development of tetraploid by octaploid cross 15 d after pollination (right). (b). Caryopsis development of octaploid by octaploid cross (left) and octaploid by tetraploid cross (right) 15 d after pollination. (c). Unfertilized ovary from tetraploid parent (left). Seed development of tetraploid by octaploid cross 20 d after pollination (right). (d). Normal, mature seed from open pollinated, tetraploid parent (right); final stage of seed development of tetraploid by octaploid cross 36 d after pollination (left). (e). Normal, mature seed from octaploid by octaploid cross (left; final stage of seed development of octaploid by tetraploid cross 30 d after pollination (right). Magnification is 26x.
