GENETIC DIVERSITY IN ARABICA COFFEE GROWN IN POTASSIUM-CONSTRAINED ENVIRONMENT

Author:

Moura Waldênia de Melo1,Soares Yaska Janaína Bastos2,Júnior Antônio Teixeira do Amaral3,Lima Paulo César de1,Martinez Hermínia Emília Prieto4,Gravina Geraldo de Amaral3

Affiliation:

1. Empresa de Pesquisa Agropecuária de Minas Gerais/EPAMIG, Brazil

2. Comissão Executiva do Plano da Lavoura Cacaueira/CEPLAC, Brazil

3. Universidade Estadual Norte Fluminense Darcy Ribeiro/UENF, Brazil

4. Universidade Federal de Viçosa/UFV, Brazil

Abstract

Potassium is a source of non-renewable natural resource, and is used in large quantities in coffee fertilization through basically imported formulations in the form of potassium chloride. An alternative to make production systems more sustainable would be obtaining cultivars more efficient in the use of this nutrient. This study aimed to evaluate the genetic diversity among 20 cultivars of coffee, in conditions of low availability of potassium to identify the best combinations for composing future populations to be used in breeding programs. The experiment was arranged in a randomized block design with three replications of nutrient solution. Agronomic characteristics and efficiencies of rooting, absorption, translocation, biomass production and potassium utilization were evaluated. The clustering analysis was based on the unweighted pair group method with arithmetic mean clustering algorithm (UPGMA) and canonical variables. Variability was observed for most treatments. The multivariate procedures produced similar discrimination of genotypes, with the formation of five groups. Hybridizations between the cultivar Icatu Precoce IAC 3283 with cultivars Catuaí Amarelo IAC 62, Araponga MG1, Caturra Vermelho IAC 477, Catuaí Vermelho IAC 15, Rubi MG 1192 and Catucaí 785/15, and between the cultivar Tupi IAC 1669-33 with cultivars Icatu Vermelho IAC 4045, Acaiá Cerrado MG 1474 and Oeiras MG 6851 are the most promising for obtaining segregating populations or heterotic hybrids in breeding programs aiming more efficiency in potassium utilization.

Publisher

FapUNIFESP (SciELO)

Subject

Soil Science,General Veterinary,Agronomy and Crop Science,Animal Science and Zoology,Food Science

Reference28 articles.

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2. Produtividade e eficiência de uso de nutrientes por cultivares de cafeeiro;AMARAL J. F.;Coffee Science,2011

3. Cultivares de café: origem, características e recomendações;CARVALHO C.H. S. de,2008

4. Modelos biométricos aplicados ao melhoramento genético;CRUZ C.D.,2012

5. Effect of N and K doses in nutritive solution on growth, production and coffee bean size;CLEMENTE J.M.;Revista Ceres,2013

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