Abstract:As avaliações de dano, na seleção de cultivares de soja resistentes ao percevejo, realizadas no Instituto Agronômico de Campinas, têm sido feitas pela produção de grãos, porcentagem de retenção foliar (PRF) e índice porcentual de dano de vagens (IPDV). Na aplicação do IPDV, têm sido utilizadas amostras da região mediana das plantas. Neste trabalho, procurou-se verificar o número de blocos, de plantas e de vagens por planta necessários para detectar, estatisticamente, diferenças de 10% entre médias de danos em … Show more
“…However, current strategies, such as the percentage index of pod damage (Rossetto et al 1986, Nagai et al 1987 and percentage of spotted seeds (Hoffmann-Campo et al 1988) for selection of resistant genotypes are extremely labor-intensive, which limits the evaluation of a large number of genotypes without ensuring the selection of the highest-yielding. Thus, the objective of this study was to show, based on resistance indices, that the weight of healthy seeds can be used as an alternative trait for the selection of soybean genotypes resistant to the stink bug complex and with high yield potential.…”
-Soybean plants with resistance to the stink bug complex are currently selected by extremely labor-intensive methods, which limit the evaluation of a large number of genotypes. Thus, this paper proposed the use of an alternative trait underlying the selection of resistant genotypes under field conditions with natural infestation: the weight of healthy seeds (WHS). To this end, 24 genotypes were evaluated under two management systems: with systematic chemical control of insects (management I), and without control (management II). Different indices were calculated using grain weight (Y P ) of management I and WHS of management II (Y S ). The high correlation between Y S and the indices mean productivity, stress tolerance and geometric mean productivity, plus the agreement in determining the groups of genotypes with resistance and high yield indicate that WHS is a useful character in simultaneous selection for these traits.
“…However, current strategies, such as the percentage index of pod damage (Rossetto et al 1986, Nagai et al 1987 and percentage of spotted seeds (Hoffmann-Campo et al 1988) for selection of resistant genotypes are extremely labor-intensive, which limits the evaluation of a large number of genotypes without ensuring the selection of the highest-yielding. Thus, the objective of this study was to show, based on resistance indices, that the weight of healthy seeds can be used as an alternative trait for the selection of soybean genotypes resistant to the stink bug complex and with high yield potential.…”
-Soybean plants with resistance to the stink bug complex are currently selected by extremely labor-intensive methods, which limit the evaluation of a large number of genotypes. Thus, this paper proposed the use of an alternative trait underlying the selection of resistant genotypes under field conditions with natural infestation: the weight of healthy seeds (WHS). To this end, 24 genotypes were evaluated under two management systems: with systematic chemical control of insects (management I), and without control (management II). Different indices were calculated using grain weight (Y P ) of management I and WHS of management II (Y S ). The high correlation between Y S and the indices mean productivity, stress tolerance and geometric mean productivity, plus the agreement in determining the groups of genotypes with resistance and high yield indicate that WHS is a useful character in simultaneous selection for these traits.
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