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

This Article Figures Only Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (5) Citing Articles via Google Scholar Google Scholar Articles by Vogel, K. P. Articles by Carlson, I. T. Search for Related Content PubMed Articles by Vogel, K. P. Articles by Carlson, I. T. Agricola Articles by Vogel, K. P. Articles by Carlson, I. T. Related Collections Other Forage Crops Crop Genetics

CROP BREEDING, GENETICS & CYTOLOGY

Winter Survival in Switchgrass Populations Bred for High IVDMD

^a USDA-ARS, 344 Keim Hall, P.O. Box 830937, Univ. of Nebraska, Lincoln, NE 68583-0937
^b Noble Foundation, P.O. Box 2180, Ardmore, OK 73402
^c Dep. of Agronomy, Iowa State Univ., Ames, IA 50011
^d Dep. of Agronomy, Purdue Univ., West Lafayette, IN 47907-1150, Dep. of Agronomy, Iowa State Univ., Ames, IA 50011 respectively

* Corresponding author (kpv{at}unlserve.unl.edu)

In vitro dry matter digestibility (IVDMD) was improved by three cycles (C) of recurrent selection in a switchgrass (Panicum virgatum L.) population but significant winter kill occurred in the Cycle 4 (C4) mass selection nursery. Stand density losses in strains differing in IVDMD also were noted in pastures intensively grazed for 3 yr. Two studies were conducted to evaluate the effect of genetic changes in IVDMD on plant survival of switchgrass. Seed was harvested from the original high IVDMD C3 parent clones to produce half-sib family seedlings that were planted into a replicated half-sib progeny evaluation nursery in 1991 at Mead, NE. This nursery was harvested in 1993 and 1995 for biomass yield after plants had headed, forage was analyzed for IVDMD, and plant survival was determined. There were significant differences among the families for biomass yield, IVDMD, and plant survival. Among the half-sib families, the correlations of 1993 and 1995 IVDMD with 1995 survival were not significant nor were the correlations between 1993 and 1995 yields and 1995 stands. In the C3 high IVDMD populations, some families had decreased winter survival but other families had high IVDMD and good survival. Randomly selected plants from pasture trials (PC or pasture clones) of ‘Trailblazer’ and ‘Pathfinder’ were polycrossed and the resulting bulk populations were evaluated with parent populations in replicated sward trials at three locations along with the High IVDMD C3 population and its derived winter survival (WS) population produced by harvesting bulk seed from surviving plants in the C4 selection nursery. Differences among populations for stand were not detected in the sward trials, likely because survival and IVDMD have low correlations within populations. It should be feasible to continue to breed for high IVDMD in switchgrass but survival will need to be an additional selection criterion.

Abbreviations: IVDMD, in vitro dry matter digestibility • WS, winter survivors • PC, pasture clones

This article has been cited by other articles:

				J. F. Pedersen, K. P. Vogel, and D. L. Funnell Impact of Reduced Lignin on Plant Fitness Crop Sci., March 28, 2005; 45(3): 812 - 819. [Abstract] [Full Text] [PDF]

				M. D. Casler, K. P. Vogel, C. M. Taliaferro, and R. L. Wynia Latitudinal Adaptation of Switchgrass Populations Crop Sci., January 1, 2004; 44(1): 293 - 303. [Abstract] [Full Text] [PDF]