Micropropagation, Characterization, and Conservation of Phytophthora cinnamomi-Tolerant Holm Oak Mature Trees

Martínez, Mª Teresa ; Arrillaga, Isabel ; Sales, Ester (Universidad de Zaragoza) ; Pérez-Oliver, María Amparo ; González-Mas, Mª del Carmen ; Corredoira, Elena

Resumen: Holm oak populations have deteriorated drastically due to oak decline syndrome. The first objective of the present study was to investigate the use of axillary budding and somatic embryogenesis (SE) to propagate asymptomatic holm oak genotypes identified in disease hotspots in Spain. Axillary budding was achieved in two out of six tolerant genotypes from the south-western region and in two out of four genotypes from the Mediterranean region. Rooting of shoots cultured on medium supplemented with 3 mg L\u22121 of indole-3-acetic acid plus 0.1 mg L\u22121 a-naphthalene acetic acid was achieved, with rates ranging from 8 to 36%. Shoot cultures remained viable after cold storage for 9-12 months; this procedure is therefore suitable for medium-term conservation of holm oak germplasm. SE was induced in two out of the three genotypes tested, by using nodes and shoot tips cultured in medium without plant growth regulators. In vitro cloned progenies of the tolerant genotypes PL-T2 and VA5 inhibited growth of Phytophthora cinnamomi mycelia when exposed to the oomycete in vitro. Significant differences in total phenol contents and in the expression profiles of genes regulating phenylpropanoid biosynthesis were observed between in vitro cultured shoots derived from tolerant trees and cultures established from control genotypes.

Idioma: Inglés

DOI: 10.3390/f12121634

Año: 2021

Publicado en: Forests 12 (2021), 1634 [23 pp]
ISSN: 1999-4907

Factor impacto JCR: 3.282 (2021)

Categ. JCR: FORESTRY rank: 14 / 70 = 0.2 (2021) - Q1 - T1

Factor impacto CITESCORE: 4.0 - Agricultural and Biological Sciences (Q2)

Factor impacto SCIMAGO: 0.623 - Forestry (Q1)

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Área Producción Vegetal (Dpto. CC.Agrar.y Medio Natural)