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Studies of F₁ Hybrids Between Photoperiod Sensitive and Non-sensitive Pennisetum Millets¹

The F₁ hybrids between crosses of ‘Tift 23A’ (cytoplasmic male-sterile line Pennisetum typhoides (Burm.) and five populations of ‘Maiwa’ (P. maiwa Stapf and Hubb) were studied for various characteristics including restoration of male fertility. Tift 23A is day-length neutral, short, and early maturing whereas Maiwa is day-length sensitive, tall, and late-maturing. Results indicate that genes for nonrestoration of cytoplasmic male sterility are present in Nigerian Maiwa populations, and that adapted A and B lines resistant to downy mildew can be produced. It also seems possible to develop high-yielding, day-length neutral, and day-length sensitive strains from the segregating generations of Tift 23A x Maiwa crosses.

Key Words: Male sterility

² Research Fellow, Ahmadu Bello University, Institute for Agricultural Research, Kano, Nigeria; and Research Agronomist, Plant Science Division, Agricultural Research Service, U. S. Department of Agriculture, and Coordinator, Sorghum, Millet and Maize Joint Project No. 26. S.T.R.C. (O.A.U.) Ahmadu Bello University, Institute for Agricultural Research, Samaru, Zaria, Nigeria.

Received for publication October 7, 1970.