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Cytology, Method of Reproduction, and Fertility of Brunswickgrass, Paspalum nicorae Parodi¹

Ten introductions of Brunswickgrass (Paspalum nicorae Parodi) had the same chromosome number, 2n=40, and different chromosome associations at diakinesis and metaphase I. Univalents ranged from 0 to 6 with an average of 0.49 per cell; bivalents ranged from 6 to 20 with an average of 16.67 per cell, and quadrivalents ranged from 0 to 7 with an average of 1.48. Some introductions had laggards and micronuclei in 50 to 60% of the cells at anaphase and telophase I and in 70% of the cells during anaphase and telophase II. Stainable pollen averaged 65.7%. Embryo sac studies and uniform progeny obtained from these introductions indicated that the plants were obligate apomicts which reproduce by apospory and pseudogamy. Seed set ranged from 18.6 to 48.0% and 5.2 to 26.4% for open- and self-pollinated conditions, respectively.

Key Words: Apomixes • Apospory • Chromosomes • Genome

² Assistant Professor of Agronomy, Mississippi State University and Research Agronomist, Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, and Mississippi Agricultural Experiment Station.

Received for publication September 20, 1969.