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Very Early Biomarkers Screening for Water Deficit Tolerance in Commercial Eucalyptus Clones
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Very Early Biomarkers Screening for Water Deficit Tolerance in Commercial Eucalyptus Clones
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Very Early Biomarkers Screening for Water Deficit Tolerance in Commercial Eucalyptus Clones
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Journal Article
Very Early Biomarkers Screening for Water Deficit Tolerance in Commercial Eucalyptus Clones
2023
Overview
The identification of genotypes more tolerant to water deficit is a challenge to breeding programs. In this research, our objectives were to identify and validate traits for tolerance to water deficit in eucalypts. The estimation of genotypic parameters and early selection are proposed based on mixed models, selection indexes and validation schemes. Seedlings with 110 days were grown in a greenhouse for 12 weeks, and two water deficit treatments were conducted (polyethylene glycol and water limitation). A total of 26 biomarkers were evaluated, and 15 of them were significant, exhibited adequate heritability, and used for screening: final plant height, increment in height, increment in diameter, area of mature and fully expanded leaf, nutrient contents of N, K, Ca, Mg, S, Cu, Zn, Mn and B, photosynthesis (A) and stomatal conductance (gs). Both treatments were adequate to discriminate water deficit-tolerant clones. The ranking of tolerant clones according to their phenotype in the field demonstrates the potential for early selection and is consistent with the maintenance of water-deficit-tolerance mechanisms until adulthood. There is evidence that the choice of biomarker depends on the species involved and different strategies contributing to the tolerance trait.
