Quality of guayule seeds separated by physical attributes |
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| Institution: | 1. Division of Horticultural and Crop Sciences, Department of Plant Sciences, The University of Arizona, Forbes 303, Tucson, AZ 85721, USA;2. EMBRAPA Pantanal, Corumbá, Brazil;1. Queensland University of Technology (QUT), Science and Engineering Faculty, School of Chemistry, Physics and Mechanical Engineering, 2 George St, 4001 QLD, Australia;2. Queensland University of Technology (QUT), Science and Engineering Faculty, School of Civil Engineering and Built Environment, 2 George St, 4001 QLD, Australia;1. USDA-ARS, U.S. Arid-Land Agricultural Research Center, 21881 North Cardon Lane, Maricopa, AZ 85138, USA;2. USDA-ARS, Robert W. Holley Center for Agriculture and Health, Ithaca, NY 14853, USA;3. Wheat Genetics Resource Center, Department of Plant Pathology, Kansas State University, Manhattan, KS 66506, USA;4. 310 Bradfield Hall, Cornell University, Ithaca, NY 14853, USA;1. USDA-ARS, U.S. Arid-Land Agricultural Research Center, 21881 North Cardon Lane, Maricopa, AZ 85138, USA;2. Department of Teaching, Learning and Sociocultural Studies, The University of Arizona, 1430 E. Second Street, Tucson, AZ 85721, USA;3. School of Plant Sciences, The University of Arizona, Forbes Bldg., Rm 303, P.O. Box 210036, Tucson, AZ 85721, USA;4. Seed Dynamics Inc., Salinas, CA 93901, USA;5. 310 Bradfield Hall, Cornell University, Ithaca, NY 14853, USA;1. Department of Botany, N N Saikia College, Titabar, Assam, India;2. Emeritus Professor, School of Life Sciences, University of Hyderabad, Hyderabad, Telengana, India;1. Programa Multi-institucional de Pós-graduação em Biotecnologia, Laboratório de Imunoquímica, Instituto de Ciências Biológicas, Universidade Federal do Amazonas-UFAM, Av. Rodrigo Octávio Jordão Ramos, 6.200, 69077-000 Manaus, AM, Brazil;2. Programa de Pós-graduação em Recursos Naturais da Amazônia, Laboratório de Bioprospecção e Biologia Experimental, Universidade Federal do Oeste do Pará-UFOPA, rua Vera Paz, s/n, Salé, Santarém, PA 68035-110, Brazil;3. Programa de Pós-graduação em Química, Universidade Federal do Pará-UFPA, Rua Augusto Corrêa, 66075-110 Belém, PA, Brazil;4. Programa de Pós-graduação em Toxinologia, Instituto Butantan, Av. Vital Brazil, 1500, 05503-900 São Paulo, SP, Brazil;1. School of Sustainable Engineering and the Built Environment, Arizona State University, 781 E. Terrace Rd., Tempe, AZ, USA;2. School of Logistics and Supply Chain, Naresuan University, 99 Tapoh, Muang, Phitsanulok 65000, Thailand;3. United States Department of Agriculture, Agricultural Research Service, Western Regional Research Laboratory, 800 Buchanan St., Berkeley, CA, USA |
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| Abstract: | Guayule (Parthenium argentatum Gray) is being developed as a new commercial crop to be grown in arid and semiarid regions. Guayule stands are presently established using transplants; however, establishment by direct-seeding would reduce costs and make production more economical. A major difficulty in field establishment by direct-seeding is the variation in the quality of guayule seeds. Guayule seeds vary greatly in color, size, and weight, which are the attributes believed to be associated with the observed germination differences among and within seed lots. To determine the importance of these attributes, guayule seeds from different seed lots were separated by size (diameter) and color, each separation class was weighed and then seed quality determined by germination percentage and rate. X-ray analysis was used to distinguish filled from unfilled seeds, and this was related to the germination results. In six guayule breeding lines (N565, 11591, AZ-2, AZ-3, AZ-4, and AZ-5), the highest quality seeds were darker (opaque-black and gray), small to medium in diameter (1.4–1.6 mm), and were heavier (a greater proportion of filled seeds). Color appeared to be a more efficient separator for seed quality than seed size; however, separation by size may be acceptable on a large scale and still provide higher quality and more uniform seed lots. |
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