Root morphological traits of oil palm genotypes with differential resistance to fatal yellowing

Gerson Carlos Pinto Gloria, Steel Silva Vasconcelos, Rui Alberto Gomes Junior, Alessandra de Jesus Boari, Marcelo Murad Magalhães

Abstract


Brazil has an extensive area where the climate and soil are suitable for oil palm growing. However, in part of this area, production has been limited by the occurrence of the fatal yellowing (FY) anomaly, whose initial symptom is the rotting of absorptive roots. This symptom can be more severe in oil palm genetic materials with a smaller root system. The aim of this study was to examine morphological traits of roots and shoots of seedlings of three oil palm genotypes with different degrees of resistance to FY, namely, Tenera (sensitive), Caiaué (resistant) and Interspecific Hybrid (resistant) to provide bases to elucidate the differential resistance of these materials to FY. Shoot biomass did not vary statistically between the genetic materials. The mass, length and area of fine and very fine roots were significantly higher in the Interspecific Hybrid than in Caiaué and Tenera. The fine and very fine roots of Interspecific Hybrid had a larger mass than Caiaué (114 and 133%, respectively) and Tenera (216 and 178%, respectively). The Interspecific Hybrid also exhibited higher values for the length of fine and very fine roots than Caiaué (155 and 99% respectively) and Tenera (228 and 94% respectively). The root traits of the Interspecific Hybrid and Tenera are compatible with their differential resistance to FY. Our results demonstrate the importance of expanding the study of the relationship between root morphology and resistance to FY in these genetic materials under conditions that favor the occurrence of the anomaly, such as flooding.

Keywords


Leaf area; Fatal Yellowing; Heterosis; Oil palm; Specific root length.

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References


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DOI: http://dx.doi.org/10.5433/1679-0359.2021v42n6p3073

Semina: Ciênc. Agrár.
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DOI: 10.5433/1679-0359
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