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Stem anatomy of parthenium argentatum parthenium incanum and their natural hybrids


Stem anatomy of parthenium argentatum parthenium incanum and their natural hybrids



American Journal of Botany 69(4): 502-512



ISSN/ISBN: 0002-9122

DOI: 10.2307/2443058

Guayule (P. argentatum Gray) contains rubber in the parenchymatous cells of stems and roots. Stem anatomy of P. argentatum and P. incanum H.B.K. (mariola) are described. Anatomy of these species differs significantly. Phloem rays in both species increase in width by cell division and expansion; the increase in mariola is smaller than that in guayule. Axial xylem parenchyma in guayule is generally a 2-cell strand as compared to the fusiform axial xylem parenchyma present in mariola. Vascular ray cells and cells of the pith region of guayule are parenchymatous, whereas those of mariola are sclerenchymatous. As a result of introgression between guayule and mariola, 3 forms of guayule exist in the native stands of Mexico. Morphological differences between these guayule plants have been described previously. The stem anatomy of these 3 groups of plants differ importantly. Group I guayule plants, least introgressed by mariola, have taller rays with the cells of pith region and vascular rays parenchymatous. Group III plants, highly introgressed by mariola, have a few to many cells of vascular rays and pith with lignified secondary walls and shorter rays. Many of the anatomical characteristics of group II plants, somewhat introgressed by mariola, are intermediate between group I and III plants. [Currently there is a renewed interest in guayule as a source of rubber because of increased cost of petroleum and increased demands for natural rubber.].

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Accession: 006476024

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Related references

Stem Anatomy Of Parthenium Argentatum, P. Incanum And Their Natural Hybrids. American Journal of Botany 69(4): 502-512, 1982

Evidence For Natural Hybridity Between Guayule (Parthenium Argentatum) And Mariola (Parthenium Incanum). American Journal of Botany 31(2): 93-99, 1944

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