Selecting Atriplex canescens for greater tolerance to competition
Issue Date
1991-05-01Keywords
phenotypic selectionphenotypic stability
genetic regulation
phenotype
crop establishment
plant cuttings
Bouteloua curtipendula
competitive ability
Atriplex canescens
environmental factors
plant competition
Metadata
Show full item recordCitation
Ueckert, D. N., & Petersen, J. L. (1991). Selecting Atriplex canescens for greater tolerance to competition. Journal of Range Management, 44(3), 220-227.Publisher
Society for Range ManagementJournal
Journal of Range ManagementDOI
10.2307/4002945Additional Links
https://rangelands.org/Abstract
Success in establishing fourwing saltbush [Atriplex canescens (Pursh) Nutt.] is often limited by competition from associated vegetation. Fourwing saltbush is reported to have abundant natural genetic variation, hence selection for plant vigor or competitiveness may be an effective tool for cultivar improvement. We observed distinctive within-accession variation in the apparent ability of fourwing saltbush seedlings to tolerate competition from sideoats grama [Bouteloua curtipendula (Michx.) Torr.] in a 1982 field planting. Superior and inferior parental saltbush phenotypes in the field planting were cloned in 1984 by rooting stem cuttings, and the cloned propagules were transplanted into plots with or without competition to test the hypothesis that the competitiveness trait was genetically controlled. Survival and canopy development of superior and inferior clones planted at the same time in competition regimens were similar, suggesting that the parental phenotypes were not genetically different in their ability to tolerate competition. Differences observed in the parental phenotypes may have been environmentally induced, or genetic differences in the clonal material may have been masked by using rooted cuttings rather than seedlings, by excessive competitive pressure in the competition regimens utilized, or both. Clones from the 2 parental phenotypes performed similarly when transplanted into competition-free regimens in November when growing conditions were favorable, but canopy development of clones from superior parental phenotypes exceeded that of those from inferior parental phenotypes when transplanted into competition-free regimens in April when growing conditions were poor.Type
textArticle
Language
enISSN
0022-409Xae974a485f413a2113503eed53cd6c53
10.2307/4002945