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
Visualitza/Obre
Data de publicació
2018-06-29ISSN
1664-462X
Resum
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.
Tipus de document
Article
Versió del document
Versió publicada
Llengua
Anglès
Pàgines
13
Publicat per
Frontiers in Plant Science
Publicat a
Frontiers Media
Citació
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.
Número de l'acord de la subvenció
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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