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Immediate Effect of Male and Female Gametes and N on Five Pearl Millet Grain Characteristics¹

Pearl millet, Pennisetum americanum (L.) Leeke, inbreds ‘Tift 12,’ ‘Tift 13’, ‘Tift 18DB’, ‘Tift 23DB’, ‘Tift 239DB’, and ‘Bil 3B’ were grown in the field in plots fertilized with 15, 80, or 150 kg/ha of N with P and K adequate to study the immediate effect of male and female gametes and N on five pearl millet grain characteristics. Plants were replicated four times. Within each N-treatment plot selfed, sibbed, open-pollinated, and intermated seed was produced so that each genotype supplied both female and male gametes. Grain characteristics determined were thousand-kernel weight (TKW), total ammo N and proline (Pro) N of grain acid hydrolysates, N/Pro ratio, and dye-binding capacity (DBC). Nitrogen treatments affected all grain characteristics except the N/Pro ratio, female gametes affected all grain characteristics, and male gametes affected TKW, proline and the N/ Pro ratio significantly. The female effect was greater than the male effect. Open-pollinated seed was significantly higher than self-pollinated seed in all characteristics measured. The data show that pollen source has an immediate effect on three of the pearl millet grain characteristics measured. They also indicate that selfpollinated seed of pearl millet and perhaps other cross-pollinated crops should be used for the most accurate assessment of grain characteristics of any genotype. A minimum seed population and a standard pollen source could serve as an alternate but less desirable substitute for selfed seed for crops with a high degree of self-incompatibility.

Key Words: Amino N • Proline • Dye-binding capacity (DBC) • Pennisetum americanum L. Leeke

² Research geneticist, AR-SEA-USDA, and the Univ. of Georgia, College of Agric. Exp. Stn., Coastal Plain Station, Tifton; acting technical assistant to the associate director for R&D Programs, Office of Health and Environmental Research, U.S. Dep. of Energy, Washington, DC 20545; and Agricultural Section, Seibersdorf Laboratory, International Atomic Energy Agency, Kartnerring 11, P.O. Box 590, A-1011 Vienna, Austria.

Received for publication April 9, 1979.