Fig. 1. Seven crossing schemes designed to determine the inheritance of the CMS-D8 restorer factor in cotton. Each specific crossing scheme is designated by a number in parentheses. (1) F₁ and BC₁ from crosses between CMS-D8 and AD₁ or AD₂. (2) F₂ from D8R (as the female parent) by AD₁. (3) Testcrosses (TC1) between (D8R x AD₁)F₁ as the female parent and AD₁. (4) F₂* from (D8R x AD₁)F₁ as the female parent crossed with the reciprocal F₁. (5) Testcrosses (TC2) between CMS-D8 and (D8R x AD₁) F₁. (6) Testcrosses (TC3) between CMS-D8 and (AD₁ x D8R) F₁. (7) Testcrosses (TC4) between CMS-D8 and individual F₂ plants from (AD₁ x D8R)F₁

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