Results 111 to 120 of about 371 (145)
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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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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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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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In vitro propagation of guayule (Parthenium argentatum gray)
Plant Science Letters, 1983Abstract A method is described for the rapid propagation of guayule plants in vitro. Shoot multiplication from excised buds wwas timulated by the presence of benzyladenine (BA) and concentrations of 1.0 mg l−1 encouraged shoot proliferation without greatly decreasing shoot length.
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Studies on the translocation system of guayule (Parthenium argentatum Gray)
Protoplasma, 1984Observations at ultrastructural level have been added to earlier descriptions of the vascular tissue inParthenium argentatum (guayule). Large transfer cells with pronounced cell wall projections were found in the phloem of the minor veins in the leaves. These cells have every appearance of being modified for the purpose of collecting photosynthates. In
Margaret G. Gilliland +2 more
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A simplified protocol for micropropagation of guayule (Parthenium argentatum gray)
In Vitro Cellular & Developmental Biology - Plant, 2000A simple, efficient protocol for in vitro micropropagation of guayule is reported. Shoot cultures were maintained on MS (Murashige and Skoog, 1962) medium supplemented with 1.0 mg l−1 (4.4 μM) 6-benzylaminopurine and 0.025 mg l−1 (0.3 μM) α-naphthaleneacetic acid.
Javier Castillón, Katrina Cornish
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An in vitro study of organogenesis in guayule (Parthenium argentatum Gray)
Plant Science, 1990Abstract The in vitro propagation of Guayule was achieved using shoot explants excised from aseptically germinated seedlings. Enganced adventitious shoot formation was obtained on Murashige and Skoog medium (MS) (half strength salts) supplemented with 0.5 mg 1 −1 6-benzylaminopurine (BA).
Ilse A. Trautmann, Johann H. Visser
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Triterpenes in Parthenium argentatum, structures of argtntatins C and D
Phytochemistry, 1990Abstract Chemical examination of the roots of Parthenium argentatum afforded the new triterpene argentatin D together with the known triterpenes incalinin, argentatin A, argentatin B and isoargentatin B, while the aerial parts of the plant afforded argentatin C.
A.Romo de Vivar +4 more
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