Estimativa de parámetros genéticos en progenies de Handroanthus chrysanthus (Jacq.) S.O. Grose en la Hoya de Loja
Handroanthus chrysanthus, known as yellow guayacán, is a deciduous tree belonging to the Bignoniaceae family. This species is noted for its strong and durable wood and is used in the construction of houses and bridges, as well as in landscaping and urban reforestation projects. Understanding the gen...
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| Format: | bachelorThesis |
| Jezik: | spa |
| Izdano: |
2024
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| Teme: | |
| Online pristup: | https://dspace.unl.edu.ec/jspui/handle/123456789/29244 |
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Dodaj oznaku | Sažetak: | Handroanthus chrysanthus, known as yellow guayacán, is a deciduous tree belonging to the Bignoniaceae family. This species is noted for its strong and durable wood and is used in the construction of houses and bridges, as well as in landscaping and urban reforestation projects. Understanding the genetic variability of Handroanthus chrysanthus in the Hoya de Loja will strengthen the knowledge of the ecology of the species and enhance its usefulness for the implementation of ex situ conservation programs and improvement programs to make optimal use of forest resources. The objective was to estimate the genetic variability and the spacing on the growth in diameter at the base and height in a trial of progenies 60 months after planting, within the Experimental Farm "La Argelia", belonging to the National University of Loja in an experimental design of systematic delineation Nelder, which is made up of 2 provenances (Jipiro Alto and Virgenpamba) and 27 families (treatments) randomly distributed. For this purpose, data on survival, plant height and diameter at the base were recorded 60 months after planting. Subsequently, genetic parameters were estimated from these traits using SELEGEN REML/BLUP software, considering growth with different spacings. The results of the analysis of variance for diameter at base and height at 60 months of age show genetic variability between provenances and significant difference between progenies (9,52 and 16,28) respectively. For the dasometric variables diameter at base and height, the provenances presented high values of additive heritability (>0,96), as well as for mean heritability of progenies (>: 0,71). The experimental coefficient of variation varied from 28,98 to 32,81 % and the accuracy registered values of 0,84 and 0,89 % for Jipiro and Virgenpamba, respectively. At 60 months of age a survival rate between 51,85 and 73,15 % was recorded, spacings 1 and 4 are the ones with the highest percentage of survival of individuals with 85,19 %; the diameter at the base recorded an average of 3,79 cm and the height an average of 97,03 cm, in both cases, spacing 1 obtained the highest average growth in diameter at the base and height with 4,30 cm and 122,27 cm respectively. In conclusion, this study revealed the existence of genetic variability in the characters evaluated at the level of provenances and progenies, in addition to the fact that spacing influenced the growth of the progenies, which represents the possibility of selection within and between families for genetic improvement. |
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