HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Beuselinck, P. R. Articles by Chilcote, D. O. Search for Related Content PubMed Articles by Beuselinck, P. R. Articles by Chilcote, D. O. Agricola Articles by Beuselinck, P. R. Articles by Chilcote, D. O.

Cytological Examinations of Two Tall Fescue Genotypes and Their Sterile Hybrids¹

Hybrids between two fertile accessions of tall fescue, Festuca arundinacea Schreb., (PI 234906, from Switzerland, and PI 174209, from Turkey) were highly sterile, with indehiscent anthers and negligible seed set (<0.01%). Both parents and the hybrids had 2n = 6x = chromosomes, without gross karyotypic variation or appreciable meiotic irregularity. The parents differed in number of secondary constrictions (8 in P1174209 and 10 in P1234906), indicating potential for cryptic structural hybridity in the F₁ hybrids. Although the frequency was low, the hybrids also had signficantly more univalents per cell than their parents (0.72 vs. 0.31 and 0.14). Since meiotic irregularities did not seem to account for the hybrid sterility, we believe it may be under genic, probably sporophytic, control.

Key Words: Festuca arundinacea Schreb. • Chromosome • Meiosis • Karyotype • Microsporogenesis • Megagametogenesis

² Graduate research assistant (now research geneticist, USDA-ARS, and assistant professor, Dep. of Agronomy, Univ. Missouri, Columbia, MO 65211), graduate student (now professor of biology, Dep. C. Biologicas, Univ. de Chile, La Serena, Chile), and professors of agronomy, Dep. of Crop Science, Oregon State Univ., Corvallis, OR 97331.

Received for publication September 28, 1981.