VARIABILITY AMONG AND WITHIN COMMON BEAN PROGENIES FROM SEGREGATING POPULATIONS

Authors

Laís Andrade Pereira, Universidade Federal de Lavras
Ângela de Fátima Barbosa Abreu, Embrapa Arroz e Feijão
Magno Antonio Patto Ramalho, Universidade Federal de LavrasFollow

Date of this Version

3-2017

Citation

ANNUAL REPORT OF THE BEAN IMPROVEMENT COOPERATIVE, No. 60, March 2017. Published by USDA.

Comments

U.S. government work.

Abstract

INTRODUCTION Bulk within progenies derived from F₂ plants (Frey 1954) is one of the most used breeding methods for common bean in Brazil. The original proposal was that from F₂ generation, individual plants would be harvested and sowed by lines, F_2:3 progenies. At harvesting time, these progenies would also be handled individually. A bulk from each progeny is used to generate the next generation. This means that each progeny is conducted by bulk method. This process is repeated until F_2:6 or further generations, when the progenies are evaluated in experiments with replications. Many common bean breeding programs in Brazil use bulk within F₂ progenies (Bulk/ F2). However, the progenies are evaluated in experiments with replication from F_2:3 generation. When applying this procedure, very often no selection is applied within the progenies, even at final stages, before releasing the new cultivars for farmers. Therefore, this new cultivar might be a multiline. In this way, this variability within progenies is not well explored. In our work the variation between and within progenies conducted by Bulk/ F₂method was estimated aiming to guide future works that also uses this method.