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Title: GENOTYPE X ENVIRONMENT EFFECTS ON LATEX AND AGRONOMIC TRAITS OF GUAYULE

Author
item Coffelt, Terry
item RAY, D - UNIV OF ARIZONA
item Nakayama, Francis
item Dierig, David

Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 9/17/2002
Publication Date: 11/15/2002
Citation: Coffelt, T.A., Ray, D.T., Nakayama, F.S., Dierig, D.A. 2002. Genotype x environment effects on latex and agronomic traits of guayule. Agronomy Abstracts.

Interpretive Summary:

Technical Abstract: Heavea latex allergies are a serious health problem. The most promising source of hypoallergenic latex to alleviate these allergies is guayule (Parthenium argentatum Gray). Data are lacking on the effects of environment and interactions between new germplasm lines and environment on growth and regrowth. The objective of this experiment was to evaluate genotype, environment, and genotype x environment effects on latex and agronomic traits of initial and regrowth of guayule. Three germplasm lines (AZ1, AZ2, and AZ3) and an unreleased breeding line (G7-14) were transplanted in the spring of 1995 and 1996 at The University of Arizona Maricopa and Marana Agricultural Research Centers. Harvests of initial plant growth were in the spring of 1997 and regrowth after the initial harvest was harvested in the spring of 1999. Plant height, plant width, biomass, and latex content were determined for initial plant growth and regrowth. All lines had good regrowth except AZ1. Differences were not observed between locations or plant ages for number of plants with regrowth. The greatest differences for all traits occurred between environments with no differences between plant ages. Plants of AZ1 were smaller than the other lines for initial growth and regrowth. Interactions were generally small and not significant for all traits. Multiple harvests should reduce production costs to growers.