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Universidade Estadual da Paraíba (2021)

Capacidade de combinação entre genótipos de algodoeiro herbáceo no semiárido nordestino

Oliveira, Valdeir de Souza

Titre : Capacidade de combinação entre genótipos de algodoeiro herbáceo no semiárido nordestino

Auteur : Oliveira, Valdeir de Souza

Université de soutenance : Universidade Estadual da Paraíba

Grade : Mestre em Ciências Agrárias 2021

Résumé partiel
Cotton is the main source of natural fiber for the textile industry, where Brazil stands out as one of the largest producers and exporters worldwide. In the Brazilian semi-arid region, this crop is of great economic importance, even if grown in rainfed. Cotton breeding programs in Brazil have sought to improve productivity, yield in ginning, fine, resistant and uniform fibers. This work aimed to estimate the general and specific capacity of combinations between cotton genotypes, select the best parents and hybrid combinations with higher productivity and quality in semiarid conditions. The experiment was conducted at the Embrapa Algodão experimental station, in the city of Barbalha, CE. The treatments were composed of 24 F3 families, with four replications, and two more treatments that served as controls (cultivars BRS 286 and BRS 416). The experimental design was in randomized blocks. The following agronomic characteristics were analyzed after harvest : cotton seed and feather productivity (kg ha-1), fiber percentage (%) and boll weight (g), and the characteristics of the fiber : length (mm), strength (gf tex-1), elongation, fineness and reliability index. The fiber analyzes were performed with the aid of the HVI equipment (Uster HVI 1000), from the Embrapa Cotton fiber laboratory. The results show that all the agronomic characteristics evaluated showed significant differences at 1%, showing the genetic variability between the F3 hybrids

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Page publiée le 19 janvier 2023