Combining Ability for Agromorphological and Physiological Traits in Different Gene Pools of Common Bean Subjected to Water Deficit

Agronomy

IsabellaMendonça Arruda¹  LeandroSimões Azeredo Gonçalves¹  Alessandra Koltun²  DouglasMariani Zeffa²  Vânia Moda-Cirino³  GetúlioTakashi Nagashima³ 

[1] Departamento de Agronomia, Universidade Estadual de Londrina (UEL), Londrina 86057-970, Brazil;Departamento de Agronomia, Universidade Estadual de Maringá (UEM), Maringá 87020-900, Brazil;Área de Melhoramento e Genética Vegetal, Instituto Agronômico do Paraná, Londrina 86047-902, Brazil;

关键词: Phaseolus vulgaris L.;    drought;    diallel;   

DOI  :  10.3390/agronomy9070371

来源: DOAJ

【 摘 要 】

Water stress is one of the main limiting factors for common bean crops, negatively affecting grain yield and seed quality. Thus, the objective of this study was to evaluate the inheritance of agromorphological and physiological traits related to drought tolerance in order to identify promising combinations. The experiment was carried out in a greenhouse with a partial diallel scheme between three drought-tolerant genotypes (IAPAR 81, BAT 477, and SEA 5), and nine cultivars widely grown in Brazil (BRS Estilo, IAC Alvorada, IPR Campos Gerais, IPR Uirapuru, IPR Nhambu, BRS Esteio, IPR Garça, BRS Radiante, and DRK 18), in a randomized block design with four replicates. The plants were grown in pots with substrate under 80% of pot capacity until they reached the stage R5, when water supply was restricted to 30% for 20 days in the pots under stress treatment. A wide variability for the agromorphological and physiological traits was observed. Water deficit reduced plant performance for most agromorphological traits and altered their physiological metabolism. Additive and non-additive effects are involved in the genetic control of the majority of agromorphological and physiological traits both under water stress and control (well-watered) conditions. The parental genotypes BAT 477 (group I) and IAC Alvorada, IPR Uirapuru, and BRS Esteio (group II) may be included in breeding programs aiming at improving drought tolerance in common bean since they present high positive general combining abilities for agromorphological traits. The crosses IAPAR 81 × IPR Campos Gerais, and SEA 5 × BRS Radiante resulted in the best combinations considering grain yield per plant and total dry biomass, when cultivated under water deficit.

【 授权许可】

Unknown