caa a22 4500 445323248 CHVBK 20180317142711.0 cr unu---uuuuu 170323e20110501xx s 000 0 eng 10.1007/s10681-010-0276-y doi (NATIONALLICENCE)springer-10.1007/s10681-010-0276-y Tetraploid bahiagrass hybrids: breeding technique, genetic variability and proportion of heterotic hybrids [Elektronische Daten] [Carlos Acuña, Ann Blount, Kenneth Quesenberry, Kevin Kenworthy, Wayne Hanna] Manipulating apomixis for fixing tetraploid bahiagrass (Paspalum notatum Flüggé) hybrids exhibiting superior agronomic characteristics would be a valuable tool for the genetic improvement of this species. The objectives were to create a second generation of hybrids by crossing sexual first-generation tetraploid hybrids (FGTH) and unrelated apomictic FGTH or ecotypes, determine the segregation for mode of reproduction, and estimate the resulting genetic variation and heterosis for several agronomic characteristics. The segregation for mode of reproduction was analyzed using mature embryo sac observations. Field measurements and visual ratings were used to evaluate the growth habit, production of inflorescences, cool-season growth and freeze resistance of hybrids. A ratio of 4.6:1 between sexual and apomictic hybrids was observed. Only 3% of the progeny was classified as highly apomictic. The low proportion of highly apomictic progeny restricts the feasibility of this breeding approach. Large genetic variation was observed among hybrids for growth habit, cool-season growth and freeze resistance. The proportion of hybrids exhibiting heterosis was high for plant height, cool-season growth, and freeze resistance. The tetraploid bahiagrass germplasm contains a large diversity for traits of agronomic importance that can be exploited for the genetic improvement of this species. Springer Science+Business Media B.V., 2010 Apomixis nationallicence Heterosis nationallicence Paspalum nationallicence Polyploidy nationallicence Acuña Carlos Universidad Nacional del Nordeste, Sargento Cabral 2131, 3400, Corrientes, Argentina aut Blount Ann North Florida Research & Education Center, 32446, Marianna, FL, USA aut Quesenberry Kenneth University of Florida, 32611, Gainesville, FL, USA aut Kenworthy Kevin University of Florida, 32611, Gainesville, FL, USA aut Hanna Wayne University of Georgia, 31793, Tifton, GA, USA aut Euphytica Springer Netherlands 179/2(2011-05-01), 227-235 0014-2336 179:2<227 2011 179 10681 https://doi.org/10.1007/s10681-010-0276-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10681-010-0276-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Acuña Carlos Universidad Nacional del Nordeste, Sargento Cabral 2131, 3400, Corrientes, Argentina aut NATIONALLICENCE 700 1- Blount Ann North Florida Research & Education Center, 32446, Marianna, FL, USA aut NATIONALLICENCE 700 1- Quesenberry Kenneth University of Florida, 32611, Gainesville, FL, USA aut NATIONALLICENCE 700 1- Kenworthy Kevin University of Florida, 32611, Gainesville, FL, USA aut NATIONALLICENCE 700 1- Hanna Wayne University of Georgia, 31793, Tifton, GA, USA aut NATIONALLICENCE 773 0- Euphytica Springer Netherlands 179/2(2011-05-01), 227-235 0014-2336 179:2<227 2011 179 10681 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer