Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Genetic improvement of the tolerance to high temperature and resistance to bean golden mosaic virus on common beans.

Abstract

In 1994-95, sources of heat tolerance were identified in common beans (Phaseolus vulgaris) after screening several germplasm and advanced lines nurseries in Choluteca and Nacaome, in the southern region of Honduras. The most heat tolerant genotypes were confirmed under controlled conditions (35/27°C day/night). Crosses were made to develop lines with heat tolerance and resistance to bean golden mosaic virus (BGMV). The F2-F5 segregant populations were evaluated for multiple traits including resistance to BGMV, common bacterial blight [Xanthomonas axonopodis pv. phaseoli], angular leaf spot [Phaeoisariopsis griseola], rust, and selected for agronomic performance and commercial value. In 1998, 217 F6 and F7 advanced lines were evaluated in the Pacific region of El Salvador for heat tolerance and BGMV resistance. The same lines were evaluated in Liberia and northwest Costa Rica, for tolerance to high temperatures; and in Honduras for resistance to common bacterial blight, angular leaf spot and rust. A group of lines were identified as having superior yields than commercial controls and better adaptation to the high temperature conditions of El Salvador and Costa Rica. Some of these lines were also resistant to BGMV in El Salvador, and moderately resistant to web blight [Rhizoctonia solani] in Costa Rica.