Pea breeding for intercropping with cereals: variation for competitive ability and associated traits, and assessment of phenotypic and genomic selection strategies
| Autor: | Barbara Ferrari, M. Romani, Nelson Nazzicari, Luciano Pecetti, Tommaso Notario, Cristina Monterrubio Martin, Paolo Annicchiarico |
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| Rok vydání: | 2021 |
| Předmět: |
plant competition dynamics
biology Phenology food and beverages Plant culture Intercropping Plant Science Ascochyta biology.organism_classification selection efficiency Genetic correlation phenology SB1-1110 Horticulture morphophysiological traits Yield (chemistry) genomics Blight GWAS Cultivar selection index Selection (genetic algorithm) Pisum sativum Original Research |
| Zdroj: | Frontiers in Plant Science Frontiers in Plant Science, Vol 12 (2021) |
| ISSN: | 1664-462X |
| DOI: | 10.3389/fpls.2021.731949 |
| Popis: | Mixed stand (MS) cropping of pea with small-grain cereals can produce more productive and environment-friendly grain crops relative to pure stand (PS) crops but may require selection to alleviate the pea competitive disadvantage. This study aimed to assess the pea variation for competitive ability and its associated traits and the efficiency of four phenotypic or genomic selection strategies. A set of 138 semi-leafless, semi-dwarf pea lines belonging to six recombinant inbred line populations and six parent lines were genotyped using genotyping-by-sequencing and grown in PS and in MS simultaneously with one barley and one bread wheat cultivar in two autumn-sown trials in Northern Italy. Cereal companions were selected in a preliminary study that highlighted the paucity of cultivars with sufficient earliness for association. Pea was severely outcompeted in both years albeit with variation for pea proportion ranging from nearly complete suppression (r≥ 0.46). The genetic correlation for pea yield across MS and PS conditions slightly exceeded 0.40 in both years. Later onset of flowering and taller plant height at flowering onset displayed a definite correlation with pea yield in MS (r≥ 0.46) but not in PS, whereas tolerance to ascochyta blight exhibited the opposite pattern. Comparisons of phenotypic selection strategies within or across populations based on predicted or actual yield gains for independent years indicated an efficiency of 52–64% for indirect selection based on pea yield in PS relative to pea yield selection in MS. The efficiency of an indirect selection index including onset of flowering, plant height, and grain yield in PS was comparable to that of pea yield selection in MS. A genome-wide association study based on 5,909 SNP markers revealed the substantial diversity of genomic areas associated with pea yield in MS and PS. Genomic selection for pea yield in MS displayed an efficiency close to that of phenotypic selection for pea yield in MS, and nearly two-fold greater efficiency when also taking into account its shorter selection cycle and smaller evaluation cost. |
| Databáze: | OpenAIRE |
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