Effect of Ppd-A1 and Ppd-B1 Allelic Variants on Grain Number and Thousand Kernel Weight of Durum Wheat and Their Impact on Final Grain Yield
The main yield components in durum wheat are grain number per unit area (GN) and thousand kernel weight (TKW), both of which are affected by environmental conditions. The most critical developmental stage for their determination is flowering time, which partly depends on photoperiod sensitivity genes at Ppd-1 loci. Fifteen field experiments, involving 23 spring durum wheat genotypes containing all known allelic variants at the PHOTOPERIOD RESPONSE LOCUS (Ppd-A1 and Ppd-B1) were carried out at three sites at latitudes ranging from 41◦ to 27◦ N (Spain, Mexico-north, and Mexicosouth, the latter in spring planting). Allele GS100 at Ppd-A1, which causes photoperiod insensitivity and results in early-flowering genotypes, tended to increase TKW and yield, albeit not substantially. Allele Ppd-B1a, also causing photoperiod insensitivity, did not affect flowering time or grain yield. Genotypes carrying the Ppd-B1b allele conferring photoperiod sensitivity had consistently higher GN, which did not translate into higher yield due to under-compensation in TKW. This increased GN was due to a greater number of grains spike−1 as a result of a higher number of spikelets spike−1. Daylength from double ridge to terminal spikelet stage was strongly and positively associated with the number of spikelets spike−1 in Spain. This association was not found in the Mexico sites, thereby indicating that Ppd-B1b had an intrinsic effect on spikelets spike−1 independently of environmental cues. Our results suggest that, in environments where yield is limited by the incapacity to produce a high GN, selecting for Ppd-B1b may be advisable.
Frontiers in Plant Science
Is part of
Arjona, Jose M., Conxita Royo, Susanne Dreisigacker, Karim Ammar, and Dolors Villegas. 2018. "Effect Of Ppd-A1 And Ppd-B1 Allelic Variants On Grain Number And Thousand Kernel Weight Of Durum Wheat And Their Impact On Final Grain Yield". Frontiers In Plant Science 9. Frontiers Media SA. doi:10.3389/fpls.2018.00888.
Grant agreement number
INIA/Programa Estatal de I+D+I orientada a los retos de la sociedad/RTA2015-00038-00-00/ES/La constitución alélica para genes responsables de la adaptación fenológica como estrategia para minimizar las limitaciones ambientales al rendimiento del trigo. Casos de estudio en ambientes objetivo de ambos hemisferios/PHENOFITTING
INIA/Programa Nacional de Proyectos de Investigación Fundamental/RTA2009-00085-00-00/ES/Bases fenológicas y genéticas de los patrones de adaptación del trigo duro a diversas condiciones fototérmicas y su utilidad para el desarrollo de germoplasma en el marco de la relación España-CIMMYT/
MINECO/Programa Nacional de Proyectos de Investigación Fundamental/AGL2012-37217/ES/HERRAMIENTAS PARA LA MEJORA DEL TRIGO DURO FRENTE A LOS RETOS DEL CAMBIO CLIMATICO/
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