The Relationship Between Achene Weight,Embryo Weight and Germination inTaraxacumApomicts |
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| Institution: | 1. Department of Horticulture, University College of Agriculture & Natural Resources, University of Tehran, Iran;2. Department of Agricultural Biotechnology, Imam Khomeini International University, Qazvin, Iran;3. Agricultural Research Center of Shahrood, Shahrood, Iran;1. Instituto de Recursos Naturales y Agrobiología (CSIC), P.O. Box 1052, 41080 Sevilla, Spain;2. Unidad Asociada al CSIC de Uso sostenible del suelo y el agua en la agricultura (US-IRNAS), Crta de Utrera km 1, 41013 Sevilla, Spain;3. Departamento de Ciencias Agroforestales, ETSIA, Universidad de Sevilla, Crta de Utrera km 1, 41013 Sevilla, Spain;4. Departamento of Riego, Centro de Edafología y Biología Aplicada del Segura (CSIC), P.O. Box 164, 301000 Espinardo, Murcia, Spain;1. Dpto. de Producción Agraria, Universidad Politécnica de Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain;2. Estación Experimental Agropecuaria Junín (Instituto Nacional de Tecnología Agropecuaria), Mendoza, Argentina;3. Instituto de Agricultura Sostenible, C.S.I.C., P.O. Box 4084, 14080 Córdoba, Spain;1. Department of Biotechnology (Plant Production and Genetic), College of Agriculture, Jahrom University, PO BOX 74135-111, Jahrom, Iran;2. Department of Horticulture Science, Ilam University, Ilam, 69315-516, Iran;1. Research Group on Quality, Safety and Bioactivity of Plant Foods, Department of Food Science and Technology, CEBAS (CSIC), P.O. Box 164, 30100 Espinardo, Murcia, Spain;2. Dept. Ciencias Agroforestales, EUITA, University of Seville, Carretera de Utrera Km 1, 41013 Sevilla, Spain;3. Instituto de Recursos Naturales y Agrobiología de Sevilla (CSIC), P.O. Box 1052, 41080 Sevilla, Spain;4. Institut des Biomolécules Max Mousseron (IBMM), UMR 5247 – CNRS – University of Montpellier – ENSCM, Faculty of Pharmacy, Montpellier, France;5. Departamento de Riego, Centro de Edafología y Biología Aplicada del segura (CSIC), P.O. Box 164, Espinardo, E-30100 Murcia, Spain |
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| Abstract: | Apomicts provide the opportunity to investigate the variation in achene size and performance that is due to factors other than genetic differences between achenes. Achene characteristics of a single capitulum from each of 15 biotypes of apomicticTaraxacumwere investigated. Within a capitulum, achene fresh weight ranged from 4.45-fold to 13.74-fold. Overall, 59.8% of achenes germinated. The probability of any one achene germinating was influenced both by its source and by its weight and ranged from 0.049 to 0.902 between capitula and from 0.028 to 0.873 between weight classes. An investigation of the relationship between achene parts in three biotypes identified a linear trend for embryos to acquire a greater proportion of total achene weight as achene weight increases. Although the heaviest achenes showed the best germination, it is predicted that, for a given investment of maternal resources, seedling number would be maximized by producing achenes of a single intermediate weight. |
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