Inheritance of rubber content and morphological traits in F sub(1) hybrids between Parthenium argentatum) (guayule) and Parthenium schottii

Interspecific hybrids were developed between the small rubber-producing shrub Parthenium argentatum (guayule) and its large nonrubber-producing relative Parthenium schottii in order to understand the inheritance of morphological traits and rubber-producing capacity in the new taxa. All F sub(1) hybr...

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Bibliographic Details
Published in:Bulletin of the Torrey Botanical Club 1984-01, Vol.111 (3), p.377-382
Main Authors: Naqvi, H H, Youngner, V B
Format: Article
Language:English
Subjects:
inheritance
interspecific hybridization
Parthenium argentatum
Parthenium schottii
yield
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Summary:Interspecific hybrids were developed between the small rubber-producing shrub Parthenium argentatum (guayule) and its large nonrubber-producing relative Parthenium schottii in order to understand the inheritance of morphological traits and rubber-producing capacity in the new taxa. All F sub(1) hybrids produced in the greenhouse were intermediate in size, vigor, and morphological traits. Rubber contents were also intermediate between the two parents. Although the per cent of rubber in the hybrids is less than that of guayule, the total amount of rubber in F sub(1) hybrids is high due to increased biomass. In terms of rubber quality, guayule showed a high molecular weight of about 2,000,000 while P. schottii) showed small traces of a very low molecular weight rubber of less than 2,000. Hybrids showed bimodal characteristics with a major peak and a minor peak corresponding to those of the two parents.
ISSN:0040-9618