Trait associations in common bean genotypes grown under drought stress and field infestation by BSM bean fly

作     者：Daniel Ambachew Firew Mekbib Asrat Asfaw Stephen E.Beebe Matthew W.Blair 

作者机构：South Agricultural Research Institute(SARI) Haramaya University International Potato Center (CIP) International Center for Tropical Agriculture (CIAT) Tennessee State University (TSU) 

出 版 物：《The Crop Journal》 (作物学报（英文版）)

年 卷 期：2015年第3卷第4期

页      面：305-316页

核心收录：

学科分类：0710[理学-生物学] 09[农学] 0904[农学-植物保护] 0901[农学-作物学] 090401[农学-植物病理学] 0902[农学-园艺学] 090402[农学-农业昆虫与害虫防治] 

基　　金：the Alliance for Green Revolution in Africa (AGRA) PASS project for providing financial support for the field study the South Agricultural Research Institute (SARI) for hosting this research Drs. I.M. Rao and B. Raatz at CIAT for supplying methods to analyze the recombinant inbred lines used as well the Bill and Melinda Gates Foundation through the Generation Challenge Program (GCP), Tropical Legume I (TL-I) project, for financial support to the research 

主　　题：Bean stem maggot(BSM) Path coefficient Selection objective Trait linkage Pleiotropism 

摘      要：Understanding functional relations among plant traits and their modulation by growing conditions is imperative in designing selection strategies for breeding programs. This study assessed trait relationships among 196 common bean genotypes exposed to stresses for drought and field infestation of bean fly or bean stem maggot(BSM). The study was carried out at two locations and data was analyzed with linear correlation, path coefficient and genotype × trait biplot analyses. Multiple trait data related to mechanisms of drought and bean fly tolerance were collected on 196 genotypes grown under i) water deficit at mid-pod fill, or ii) unprotected against bean fly; iii) irrigated, well watered conditions, or iv) bean fly protection with chemicals. Seed yield exhibited positive and significant correlations with leaf chlorophyll content, vertical root pulling resistance, pod harvest index, pods per plant and seeds per pod at both phenotypic and genotypic levels under stress and non-stress conditions. Genotypic correlations of traits with seed yield were greater than their respective phenotypic correlations across environments indicating the greater contribution of genotypic factors to the trait correlation. Pods per plant and seeds per pod had high positive direct effects on seed yield both under stress and non-stress whereas pods per plant had the highest indirect effect on seed yield through pod harvest index under *** general, our results suggest that vertical root pulling resistance and pod harvest index are important selection objectives for improving seed yield in common beans under non-stress and stress conditions, and particularly useful for drought and BSM tolerance evaluation.