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High Rubber Yielding Selections from a Natural Population of Guayule 1
Author(s) -
Johnson B. Lennart
Publication year - 1950
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1950.00021962004200070007x
Subject(s) - population , geneticist , citation , library science , agriculture , mathematics , political science , agricultural science , sociology , geography , computer science , biology , demography , archaeology , genetics
N his report on seed collections of guayule from I Mexico and the Trans-Pecos Area of Texas, Powers (9)3 lists 434 collections which are described as nonselected samples, mass selections, and individual plant selections. Collection 65 (accession 4265) from the State of Durango is described as a mass collection “from 5 plants growing in an isolated area along the road from La Mancha to Pasaje. The plants were large and of exceptionally good guayule type”. Accession 4265 was included in two experimental plantings established by the Guayule Research Project a t Salinas, Calif., in 1943. T h e present report deals with the performance of this accession as compared with that of commercial variety 593 in these plantings and presents data to show that accession 4265 may be classified into three predominant types, two of which are of promising commercial value. Variety 593 developed by Dr. W. B. McCallum for the Intercontinental Rubber Company is the strain of guayule most widely grown commercially, owing largely to its high rubber content. From a test of seven commercial varieties at Salinas, Calif., Federer (3) obtained results which showed that for I-year old plants variety 593 had a significantly higher percentage of rubber per plant on a dry weight basis than any of the others and that it ranked as one of the two highest in total yield of rubber per acre. Subsequent data* on the same seven varieties tested at Salinas, Calif., Phoenix, Ariz., Anthony, N. M., and Edinburg, Texas, showed that for 2-year old plants as an average of all four locations variety 593 was significantly higher than any of the others both in percentage of rubber per plant and total yield of rubber per acre.