Abstract
Quantitative and qualitative variations in rubber from 14 cultivars of guayule were studied. Average molecular weight (M w ) was determined through gel permeation chromatography. There were wide variations in phenology, resin, rubber content, and rubber quality; however, no correlation could be observed among biomass, resin, and rubber content. Most of the cultivars had a unimodal refractive index response of polyisoprene except in those cultivars where resin content exceeded that of rubber. The high resin percentage affected the quality of rubber and not its quantity. The present study does not specify the essential threshold temperature minimum to trygger cis-polyisoprene synthesis
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