Researchers from brazilselected genetically modified(GM) progenies of
the common bean (/Phaseolus vulgaris/L.) that were found to be resistant
to the three most common viruses of the plant. The GM common bean can
potentially decrease yield losses for farmers and reduce virus spread in
the field.

The bean common mosaic virus (BCMV), bean golden mosaic virus (BGMV) and
cowpea mild mottle virus (CMMV) all severely affect the common bean,
with the BGMV and CMMV being transmitted by whitefly. GM common bean
progenies were developed through conventional breedingand molecular
tools with/BRS Estilo/and/BRS Sublime/as recurrent parents. Both parents
have moderate natural resistance to CMMV. They are also resistant to
BCMV but susceptible to BGMV.

Two field trials were conducted to assess the agronomic performance and
disease severity of the plants. Thirty-nine progenies out of 477 were
selected after the field trials and were subjected to molecular analyses
to identify the presence of BCMV and BGMV resistance alleles. Mechanical
inoculation with scaling was used to measure CPMVV resistance. Five
progenies that showed resistance to all three viruses were further
selected. Upright plant architecture, resistance to plant lodging, and
quality market class grains were also observed from the five progeny
lines. These lines have the potential for further development of a
common bean variety with combined high yield, desirable agronomic and
grain quality traits, and multiple virus resistance.

Transgenic Elite Lines of Carioca Seeded Common Bean (Phaseolus Vulgaris
L.) With Multiple Resistance to Viruses Reduce Cowpea Mild Mottle Virus
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