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Meiosis and Pollen Viability in Hexaploid Triticale¹

Meiosis and pollen viability were studied in three triticale populations, bulk, outcross and pureline. Sporocytes collected at random in these populations showed that the outcross population was less stable cytologically than the bulk and pureline populations. Cytological instability, expressed by number of univalents at metaphase I and occurrence of micronuclei at telophase I and quartet stages, was common. Meiotic index was positively correlated with seedset but not with seed size. Meiotic index was positively correlated with the percentage of normal cells at telophase I but not at metaphase I. Pollen viability varied with lines, populations, locations, and years.

Key Words: Meiotic index • Chromosome • Sporocytes • Meiotic abnormalities • Fertility

² Research Fellow, Department of Natural Resources and Environmental Studies, Alabama A&M University, Normal, Alabama 35762; and Agronomist, Kansas State University, Manhattan, Kansas 66506

Received for publication June 8, 1972.