Assessing Genetic Variation in Resistance to Pinewood Nematode (<i>Bursaphelenchus xylophilus</i>) in <i>Pinus radiata</i> D. Don Half-Sib Families
Full understanding and control of pine wilt disease (PWD) is a work in progress and breeding for disease resistance constitutes an essential management strategy for reducing its impact, as evidenced by advanced breeding programs in countries such as Japan. Since <i>Pinus radiata</i> is o...
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| Autores principales: | , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/f19f4a14468049f5b56a42429958f4a2 |
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| Sumario: | Full understanding and control of pine wilt disease (PWD) is a work in progress and breeding for disease resistance constitutes an essential management strategy for reducing its impact, as evidenced by advanced breeding programs in countries such as Japan. Since <i>Pinus radiata</i> is one of the most commercially relevant species in northern Spain, we designed a study to assess genetic variation in susceptibility to this pathogen using 44 <i>P. radiata</i> half-sib families from the Galician breeding program. Three <i>Bursaphelenchus xylophilus</i> (pinewood nematode, PWN) inoculation experiments were performed to evaluate disease-related variables, estimate genetic parameters, and study sources of genotype by environment interaction (G × E). We also looked at differences in the constitutive chemical compounds of susceptible and non-susceptible individuals. The results showed great variation in PWN susceptibility, with survival rates for <i>P. radiata</i> families ranging from 0% to 90%. In addition, heritability estimates (h<sub>i</sub><sup>2</sup> = 0.43, h<sub>f</sub><sup>2</sup> = 0.72) and genetic gain (>26% selecting 50% of the families) were both moderately high for survival. Significant differences in several constitutive chemical compounds were found between susceptible and non-susceptible seedlings in the two susceptibility groups considered. These results confirm the potential of breeding to obtain <i>P. radiata</i> genotypes that are resistant to pine wilt disease and open possibilities for mitigating its future impact on <i>P. radiata</i> stands. |
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