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Cytology, Reproductive Behavior, and Fertility Characteristics of Centipedegrass¹

Centipedegrass, Eremochloa ophiuroides (Munro) Hack., is an excellent lawn grass in the southeastern U.S. but information is limited on its cytology, reproductive characteristics, and fertility. Cytological observations on several introductions from China and on local sources of common centipedegrass showed that metaphase I meiosis was regular with nine bivalents; however, eight bivalents + two univalents were observed in 1 to 15% of the microsporocytes due to a precociously dividing bivalent. Pollen stainability ranged from 93 to 99%. Megasporogenesis and embryo sac development revealed normal sexual development and functional embryo sacs at anthesis. It was concluded that centipedegrass is a sexually reproducing species. Open-pollinated, cross-pollinated, and selfed seed ranged from 59 to 90%, 45 to 66%, and 0.0 to 58%, respectively. A self incompatibility system is present in centipedegrass.

Key Words: Incompatibility • Chromosome behavior • Sexual • Seed set

² Research geneticists, SEA-USDA-FR, and the Univ. of Georgia College of Agriculture Exp. Stn.

Received for publication March 9, 1978.

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