Resumen de Evaluation of drought tolerance indices in vegetable-type soybean

Rouxléne van der Merwe, Siphe Tyawana, J. A. van der Merwe, Obed Mwenye

• español

  La necesidad de un cultivo altamente nutritivo que pueda ayudar a aliviar la desnutrición en las comunidades periurbanas de Sudáfrica ha llevado al establecimiento de la soja hortí- cola como un cultivo en el país. Con la introducción de un nuevo cultivo se necesitan ensayos multi-ambientales para identificar cultivares prometedores para la producción por parte de los agricultores, así como para identificar cultivares que muestren adaptación a varias áreas de producción. Por lo tanto, existe la necesidad de evaluar los cultivares de soja hortícola La necesidad de un cultivo altamente nutritivo que pueda ayudar a aliviar la desnutrición en las comunidades periurbanas de Sudáfrica ha llevado al establecimiento de la soja hortí- cola como un cultivo en el país. Con la introducción de un nuevo cultivo se necesitan ensayos multi-ambientales para identificar cultivares prometedores para la producción por parte de los agricultores, así como para identificar cultivares que muestren adaptación a varias áreas de producción. Por lo tanto, existe la necesidad de evaluar los cultivares de soja hortícola

• English

  The need for a highly nutritive crop that can help alleviate malnutrition among peri-urban communities in South Africa has led to the establishment of vegetable-type soybean as a crop in the country. With the introduction of a new crop, multi-environment trials are necessary in order to identify promising cultivars for production by farmers as well as to identify cultivars that show adaptation to various production areas. Thus, there is a need to evaluate the intro- duced vegetable-type soybean cultivars in terms of yield-based drought tolerance indices and to identify cultivars that would perform well in areas that are inclined to drought stress condi- tions. In total, 15 genotypes were subjected to two water treatments, a water-limited-induced stress (WLIS) treatment and a non-WLIS treatment, using controlled irrigation throughout the growth cycle. The field trial was laid out in a factorial design with three replications. At maturity, data on seed yield were recorded and subjected to analysis of variance. Nine yield- based tolerance indices were calculated and respectively used in correlations, principal com- ponents and cluster analyses. Highly significant genotype, treatment and interaction effects were observed indicating variation in terms of cultivars and their response to the water treat- ments. Highly significant correlations were observed among the tolerance indices indicating that they could be used to discriminate cultivars showing high yield potential respectively under both conditions, WLIS and non-WLIS conditions. Cultivars were further separated according to their tolerance and yield stability. AGS354 was the best yielding cultivar under both water treatments, UVE7 and UVE14 were the most tolerant and stable of all cultivars while PAN1729 and UVE8 were identified as good performers under non-WLIS conditions.

  UVE17 was most susceptible and unstable to WLIS. The tolerance indices together with mul- tivariate analyses were effective in differentiating tolerant and stable vegetable-type soybean cultivars that could be promoted for production by farmers