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 Asay, K. H. Articles by Horst, G. L. Search for Related Content PubMed Articles by Asay, K. H. Articles by Horst, G. L. Agricola Articles by Asay, K. H. Articles by Horst, G. L.

Genetic Variability for Net Photosynthesis in Tall Fescue¹

Significant differences in net carbon exchange (NCE) were detected among tall fescue (Festuca arundinacea Schreb.) clonal lines and among their polycross progenies under sward conditions in the field. On dates when differences among parental lines were significant, heritability values ranged from 0.57 to 0.83 in the broad sense, and from 0.22 to 0.44 in the narrow sense. In those instances, expected genetic advance with selection of the upper 5% of the population ranged from 0.77 to 3.13 mg CO₂ dm^_*2 hr^_*1. Genetic variation was from four to six times greater among the parental lines than their polycross progenies. Rates of NCE were significantly increased by irrigation during periods of drought stress. The magnitude of the genetic variability was also greater under more favorable moisture conditions; however, relative differences among genotypes were not consistent under the two moisture regimes. It appears that genetic progress can be made through selection for NCE rate in tall fescue, but the environment must be considered during selection

Key Words: Heritability • Net carbon exchange • Water stress • Grass breeding • Festuca arundinacea Schreb

² Associate Professors of Agronomy, University of Missouri, Columbia, MO 65201; and Assistant Professor of Agronomy, Texas A & M Univerity, Agricultural Research Station at El Paso, respectively.

Received for publication January 5, 1974.

This article has been cited by other articles:

				W. N. Stiller, J. J. Read, G. A. Constable, and P. E. Reid Selection for Water Use Efficiency Traits in a Cotton Breeding Program: Cultivar Differences Crop Sci., May 6, 2005; 45(3): 1107 - 1113. [Abstract] [Full Text] [PDF]