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Micropropagation of Guayule (Parthenium argentatum)
1992Guayule is a member of the family Compositae, and belongs to the genus Parthenium (Fig. 1). It is a rubber-producing shrub, native to a semi-arid area in north-central Mexico and southwestern Texas, USA. The plant, with chromosome numbers of 2n = 36 to 108 or more, has narrow leaves, covered in a drought-protecting white wax, that alternate along the ...
Huizhu Xu, Minzhi Qian
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Notes on Parthenium Argentatum A. Gray (Asteraceae)
Indian Journal of Forestry, 2014Parthenium argentatum A. Gray, an introduced species is reported on the basis of herbarium specimens prepared from cultivated plant. A brief description alongwith distribution, ecological observation, illustration, photographs, etc. are provided herewith to facilitate easy identification of the species.
Jeetendra Vaishya +2 more
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Parthenium species of potential use in the improvement of guayule, Parthenium argentatum
Journal of Arid Environments, 1986Guayule, Parthenium argentatum, a desert shrub indigenous to Mexico, has been used at various times in the past for the production of natural rubber. A revived interest in this plant as a rubber source has led to attempts to domesticate it and develop improved varieties.
V.B. Youngner +3 more
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Triterpenoids from Parthenium argentatum x P. tomentosa
Phytochemistry, 2002Four tetracyclic triterpenoids and lupeol were isolated from the hybrid Parthenium argentatum x P. tomentosa. The new triterpenoids were identified as 16, 24-epoxy-3 alpha-hydroxylanost-8-ene (argentatin E); 16, 24-epoxy-25-hydroxycycloart-1, 11, 22-trien-3-one (argentatin F); 16,24-dihydroxycycloart-20, 25-dien-3-one (argentatin G) and 16, 24 ...
Galal T, Maatooq +4 more
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On the Inheritance of Apomixis in Parthenium argentatum
Botanical Gazette, 19501. In feral guayule the diploids (2n = 36) reproduce sexually, but polyploids are facultative apomicts. A fertile polyhaploid with the diploid number of chromosomes but facultatively apomictic in its reproduction was crossed with a diploid. If the polyhaploid was used as a female, the following progeny classes resulted: maternals, diploid F1, triploids,
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Parthenain, a protease from Parthenium argentatum
Phytochemistry, 1988Abstract A homogeneous protease, parthenain, was isolated from Parthenium argentatum . The enzyme has serine at the active site and a dependence on free histidine residues. It is a glycoprotein of M r , about 63 000 and is composed of a single unit of pI 4.6. The enzyme has a preference for neutrally charged amino acid residues in oxidized insulin
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Seed quality of guayule (Parthenium argentatum Gray)
2006The germination potential of guayule seed is considered too poor for direct seeding. Relating seed quality to field conditions could provide information on suitable locations and management to improve seed quality. The study objective was to determine seed quality of guayule grown under different field conditions in Arizona.
Bekaardt, Claude Ron +5 more
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A preliminary study of the carbohydrate metabolism in Parthenium argentatum
Bioresource Technology, 1991Abstract The decline in starch observed in guayule at the end of summer cannot be attributed to a decrease in temperature, but rather that starch can, upon hydrolysis, provide carbon for the synthesis of fructans. In this plant, fructans are important winter reserves arising from a changed ratio of carbon utilization to carbon fixation, and are seen ...
K.M. Kelly, J. Van Staden
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Essential leaf oils of Parthenium argentatum A. Gray
Journal of Agricultural and Food Chemistry, 1979When guayule (Parthenium argentatum) is processed for rubber the leaves are discarded. Essential oils from guayule leaves were therefore steam distilled and the major monoterpenes were examined by gas chromatography-mass spectrometry. Alpha-pinene, camphene, beta-pinene, sabinene, beta-myrcene, limonene, terpinolene, beta-ocimeme and ocimene were ...
Rainer W. Scora, Junji Kumamoto
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In vitro propagation of guayule (Parthenium argentatum) ? a rubber yielding shrub
Plant Cell Reports, 1989Nodal explants (0.5 to 0.8 cm long) isolated from 2-year old shrubs of guayule, Parthenium argentatum Gray, when cultured on MS medium supplemented with different concentrations of KN, BAP, 2,4-D, 2,4-D + BAP, NAA and NAA + BAP produced callus tissues and shoots simultaneously with varying frequencies.
A C, Dhar, P B, Kavi Kishor, A M, Rao
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