Journal
PLANTS-BASEL
Volume 10, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/plants10061079
Keywords
biomass allocation; breeding for resistance; dry matter content; leaf area; lignin; root architecture; SRA (specific root area); SRL (specific root length); Verticillium dahliae
Categories
Funding
- Spanish Ministerio de Ciencia e Innovacion [CGL2014-53236-R]
- Ministerio de Economia, Industria y Competitividad [AGL201675729-C2-1-R]
- Ministerio de Ciencia e Innovacion/Agencia Estatal de Investigacion [PID2019106283RB-I00]
- Junta de Andalucia (Spain) [18 REF 27943 MOD B]
- European FEDER funds
- [P18-RT-3455]
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The study found differences in functional traits between olive varieties tolerant and susceptible to Verticillium wilt, with tolerant varieties having larger leaf area, dry matter content and mass fraction for stems, but lower leaf mass fraction. Root system architecture was identified as the most significant difference between tolerant and susceptible cultivars.
Verticillium wilt of olive (VWO), caused by the soil-borne pathogen Verticillium dahliae, is considered one of the most important diseases affecting this tree crop. One of the best VWO management measures is the use of tolerant cultivars. Remarkably, no information is available about olive functional traits and their potential relationship with tolerance to V. dahliae. Twenty-five selected functional traits (for leaf, stem, root and whole plant) were evaluated in six olive varieties differing in their VWO tolerance level to identify possible links between this phenotype and functional traits' variation. High intervarietal diversity was found among cultivars and several functional traits were related with VWO tolerance. Tolerant varieties showed higher leaf area, dry matter content (leaf, stem and plant) and mass fraction for stems, but lower for leaves. Significant differences were also detected for root functional traits, tolerant cultivars displaying larger fine root diameter and lignin content but smaller specific length and area of thick and fine roots. Correlations were found among functional traits both within varieties and between levels of tolerance/susceptibility to VWO. Associations were observed between biomass allocation, dry matter content and VWO tolerance. The most relevant difference between tolerant and susceptible cultivars was related to root system architecture.
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