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 HighWire Citing Articles via Google Scholar Google Scholar Articles by Bennett, H. W. Articles by Bashaw, E. C. Search for Related Content PubMed Articles by Bennett, H. W. Articles by Bashaw, E. C. Agricola Articles by Bennett, H. W. Articles by Bashaw, E. C.

Intraspecific Hybridization in Dallisgrass, Paspalum dilatatum Poir.¹

Rare intraspecific Paspalum dilatatum Poir, hybrids (2n=45) were produced by using a yellow-anthered sexual biotype (2n=40) as the female and a common apomictic biotype (2n=50) as the male. All F₁ hybrids were sexual In meiosis, the chromosomes formed 20 bivalents and 5 univalents, which indicates that the biotypes are closely related. The yellow-anthered biotype may be one of the common biotypes' ancestors. Because the univalents were lost during meiosis in the F₁ and F₂; all F₃, F₄, and F₅ plants had 40 chromosomes which formed 20 bivalents during meiosis. All progeny were sexual.

Semidecumbent habit of growth served as the basis for a selection program regardless of additional selection for any other plant characteristic. Selection for improved seed fertility was practiced among semi-decumbent segregates. Seed set increased progressively from 40, 70, to 80% for the F₂, F₃, and F₄ generations, respectively

Semidecumbent F₆ lines exceeding 90% seed set indicate the effectiveness of intraspecific hybridization as a breeding procedure for the improvement of apomictic types.

Key Words: Seed fertility • Increased seed set • Chromosomes • Apomixis • Pollen viability • Biotype relationship

² Research Agronomist, Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, and Mississippi Agricultural Experiment Station; Assistant Agronomist, Mississippi Agricultural Experiment Station; and Geneticist, Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, College Station, Texas.

Received for publication May 24, 1969.

This article has been cited by other articles:

				A. M. Casa, S. E. Mitchell, C. R. Lopes, and J. F. M. Valls RAPD Analysis Reveals Genetic Variability Among Sexual and Apomictic Paspalum dilatatum Poiret Biotypes J. Hered., July 1, 2002; 93(4): 300 - 302. [Abstract] [Full Text] [PDF]