Effect of allele combinations at Ppd‐1 loci on durum wheat grain filling at contrasting latitudes
Flowering time is the most critical developmental stage in wheat, as it determines environmental conditions during grain filling. Thirty‐five spring durum genotypes carrying all known allele variants at P p d ‐1 loci were evaluated in fully irrigated field experiments for three years at latitudes of...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2019 |
| País: | España |
| Institución: | Institut de Recerca i Tecnologia Agroalimentàries (IRTA) |
| Repositorio: | IRTA Pubpro. Open Digital Archive |
| OAI Identifier: | oai:repositori.irta.cat:20.500.12327/492 |
| Acceso en línea: | http://hdl.handle.net/20.500.12327/492 https://doi.org/10.1111/jac.12363 |
| Access Level: | acceso abierto |
| Palabra clave: | 633 |
| Sumario: | Flowering time is the most critical developmental stage in wheat, as it determines environmental conditions during grain filling. Thirty‐five spring durum genotypes carrying all known allele variants at P p d ‐1 loci were evaluated in fully irrigated field experiments for three years at latitudes of 41°N (Spain), 27°N (northern Mexico) and 19°N (southern Mexico). Relationships between weight of central grains of main spikes (W) and thermal time from flowering to maturity were described by a logis‐tic equation. Differences in flowering time between the allele combination causing the earliest (GS100/Ppd‐B1a) and the latest (Ppd‐A1b/Ppd‐B1a) flowering were 7, 20 and 18 days in Spain, northern Mexico and southern Mexico, respectively. Flowering delay drastically reduced the mean grain filling rate (R) and W at all sites. At autumn‐sowing sites, an increase of 1°C in mean temperature during the first half of the grain filling period decreased W by 5.2 mg per grain. At these sites, W was strongly dependent on R. At the spring‐sowing site (southern Mexico), W depended on both Rand grain filling duration. Our results suggest that incorporating the allele combina‐tions GS100/Ppd‐B1a and GS105/Ppd‐B1a (alleles conferring photoperiod insensitiv‐ity) in newly released varieties can reduce the negative effects of climate change on grain filling at the studied latitudes |
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