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oai:recercat.cat:20.500.12327/18642025-10-22T11:09:26Zcom_2072_4428com_2072_4427col_2072_487898

Changes in durum wheat root and aerial biomass caused by the introduction of the Rht-B1b dwarfing allele and their effects on yield formation Subira, Joan Ammar, Karim Álvaro, Fanny García del Moral, Luis F. Dreisigacker, Susanne Royo, Conxita Producció Vegetal Cultius Extensius Sostenibles 633 Aims This study aimed to quantify the changes in root and aerial biomass of durum wheat brought about by the introduction of the Rht-B1b dwarfing allele and their effects on yield formation. Methods A historical series of 24 Mediterranean cultivars with allelic variants a (tall) and b (semi-dwarf) at Rht-B1 locus was tested in tubes in three greenhouse experiments and six field experiments. Results The dwarfing allele reduced the aerial biomass of each plant at anthesis by 7.6 % and the root by 28.1 % (25.4 %, 26.7 % and 36.0 % in the upper, middle and lower root sections, respectively). Aerial and root biomass were reduced by 27.0 g y−1 and 7 g y−1 respectively, but the relative rate of change was much greater for roots (−0.73 % y−1) than for aerial organs (−0.17 % y−1). Aerial biomass at anthesis was negatively associated with spike number, harvest index and yield in tall cultivars, but no significant relationship was found for semi-dwarf ones. Conclusions The root/aerial biomass ratio was 29 % lower in semi-dwarf than in tall cultivars. In tall cultivars large aerial biomass at anthesis was detrimental to yield formation, while in semi-dwarf cultivars high aerial biomass at anthesis had no effect on yield formation. info:eu-repo/semantics/publishedVersion 2016-01-27 info:eu-repo/semantics/article Subira, Joan, Karim Ammar, Fanny Álvaro, Luis F. García del Moral, Susanne Dreisigacker, and Conxita Royo. 2016. "Changes In Durum Wheat Root And Aerial Biomass Caused By The Introduction Of The Rht-B1b Dwarfing Allele And Their Effects On Yield Formation". Plant And Soil 403 (1-2): 291-304. doi:10.1007/s11104-015-2781-1. 0032-079X http://hdl.handle.net/20.500.12327/1864 https://doi.org/10.1007/s11104-015-2781-1 eng Plant and Soil MICYT/ /AGL2002-04285/ES/ / MINECO/Programa Nacional de Proyectos de Investigación Fundamental/AGL-2012-37217/ES/HERRAMIENTAS PARA LA MEJORA DEL TRIGO DURO FRENTE A LOS RETOS DEL CAMBIO CLIMATICO/ INIA/Programa Estatal de promoción del talento y su empleabilidad en I+D+I/RTA2012-00010-C03-01/ES/Obtención de nuevas variedades de trigo harinero adaptadas a las demandas actuales del sector agroindustrial en el marco de una agricultura sostenible/ Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess 14 Springer