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Incompatibility Systems in Switchgrass

^a Univ. Autónoma Agraria Antonio Narro, Buenavista, Saltillo, Coahuila, México
^b USDA-ARS, 344 Keim Hall, Univ. of Nebraska, P.O. Box 830937, Lincoln, NE 68583-0937

View larger version (118K): [in a new window]   Fig. 1. Classes of switchgrass caryopsis development from a tetraploid by tetraploid cross. From left to right: unfertilized ovary; small caryopsis with limited endosperm development, i.e., endosperm is small and has a floury appearance; small caryopsis generally brownish in color with shriveled endosperm; and normal caryopsis. Magnification x26.

View larger version (170K): [in a new window]   Fig. 2. (a). Caryopsis development of tetraploid by octaploid switchgrass cross 2 d after pollination. (b). Caryopsis development 2 d after pollination. From left to right; non-pollinated ovary, selfed octaploid, octaploid by tetraploid cross, and octaploid by octaploid cross (control). (c). Unfertilized ovary from tetraploid parent (left); caryopsis development of tetraploid by octaploid cross 6 d after pollination (right). (d). Caryopsis development of octaploid by octaploid cross (left) and octaploid by tetraploid cross (right) 6 d after pollination. (e). Unfertilized ovary from tetraploid parent (left); seed development of tetraploid by octaploid cross 10 d after pollination (right). (f). Caryopsis development of octaploid by octaploid cross (left) and octaploid by tetraploid cross (right) 10 d after pollination. Magnification is 26x.

View larger version (136K): [in a new window]   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.