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Effects of Ppd-A1 and Ppd-B1 alleles on the phenology of durum wheat grown at contrasting latitudes

By: Contributor(s): Material type: TextTextPublication details: Mexico, DF (Mexico) CIMMYT : 2011Description: p. 111ISBN:
  • 978-970-648-179-5
Summary: Photoperiod sensitivity and vernalization response are main genetic factors regulating time to heading. This research aimed to study the effect of the latitude on the expression of the major genes regulating the photoperiod sensitivity in durum wheat. Field experiments, involving 41inbred lines with different allele combinations for the Ppd-A1 and Ppd-B1 loci, but equally dominant for Vrn-A1, were conducted during two years at four contrasting latitudes (41º38?N Spain-north, 37º0?N Spain-south, 27º21?N Mexico-north, and 19º31?N Mexico-south). The ANOVA revealed that the effects of the genotype, latitude and the genotype x latitude interaction accounted for 40.2%, 39.5% and 12.0% respectively, of total variance for thermal-time from sowing to heading. In autumn-planted experiments thermal time until heading significantly increased when moving from northern to southern sites. The shortest thermal-time until heading was recorded in experiments planted during the spring in southern Mexico, which had the longest daylength in the pre-heading period. The clustering of the genotypes according to the alleles present in the Ppd-A1 and Ppd-B1 loci explained 50% of the variability attributed to genotype in thermal-time until heading. The largest variability for cycle length until heading was recorded in genotypes carrying the Ppd-A1 allele conferring photoperiod sensitivity. The earliest genotypes had the Ppd-A1 alleles conferring photoperiod insensitivity, while the combination of Ppd-A1 sensitive with Ppd-B1 insensitive produced the latest genotypes. The alleles present in the Ppd loci interacted with the latitude effect in the expression of the cycle duration until heading. This study was partially funded by MICINN (Spain) under projects RTA2009-00085-00 and AGL2009-11187. This work was conducted in the framework of the agreement INIA (Spain)-CIMMYT. The Centre UdL-IRTA forms part of the Centre CONSOLIDER INGENIO 2010 on Agrigenomics funded by the Spanish Ministry of Education and Science.
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Abstract only

Photoperiod sensitivity and vernalization response are main genetic factors regulating time to heading. This research aimed to study the effect of the latitude on the expression of the major genes regulating the photoperiod sensitivity in durum wheat. Field experiments, involving 41inbred lines with different allele combinations for the Ppd-A1 and Ppd-B1 loci, but equally dominant for Vrn-A1, were conducted during two years at four contrasting latitudes (41º38?N Spain-north, 37º0?N Spain-south, 27º21?N Mexico-north, and 19º31?N Mexico-south). The ANOVA revealed that the effects of the genotype, latitude and the genotype x latitude interaction accounted for 40.2%, 39.5% and 12.0% respectively, of total variance for thermal-time from sowing to heading. In autumn-planted experiments thermal time until heading significantly increased when moving from northern to southern sites. The shortest thermal-time until heading was recorded in experiments planted during the spring in southern Mexico, which had the longest daylength in the pre-heading period. The clustering of the genotypes according to the alleles present in the Ppd-A1 and Ppd-B1 loci explained 50% of the variability attributed to genotype in thermal-time until heading. The largest variability for cycle length until heading was recorded in genotypes carrying the Ppd-A1 allele conferring photoperiod sensitivity. The earliest genotypes had the Ppd-A1 alleles conferring photoperiod insensitivity, while the combination of Ppd-A1 sensitive with Ppd-B1 insensitive produced the latest genotypes. The alleles present in the Ppd loci interacted with the latitude effect in the expression of the cycle duration until heading. This study was partially funded by MICINN (Spain) under projects RTA2009-00085-00 and AGL2009-11187. This work was conducted in the framework of the agreement INIA (Spain)-CIMMYT. The Centre UdL-IRTA forms part of the Centre CONSOLIDER INGENIO 2010 on Agrigenomics funded by the Spanish Ministry of Education and Science.

Global Wheat Program

English

Lucia Segura

INT2585|INT2692

CIMMYT Staff Publications Collection


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