Search

Background: Pests and diseases infestations reduce the quantity and quality of seed yields. The objective of this study was to identify the correlation value between level of resistance to pests and chemical (fat and protein) concentrations of soybean genotypes. Methods: A total of 15 soybean genotypes were planted in field and glass house environments in 2017. Observations were made on the infestation intensity of pest and disease, dry seed yield, yield components and chemical (fat and protein) concentrations. Result: Soybean genotype DG-91-8 showed resistant (R) category to pod borer and pod sucker, while DM-122-35-17 showed resistant (R) category to army worm and pod borer. Two highest yielding genotypes (DG-91-8 and DG-99-32-14) had 15% higher seed yield than check variety Dering 1 (2.41 t/ha), with higher 100 seeds weight and pod number/plant. Fat concentration showed a significant positive correlation value with leaf rust disease. Pod suckers showed a significant positive correlation value with pod borer infestation, indicating that they had the same preference for soybean pods. Soybean genotypes DG-91-8 showed high seed yield (2.70 t/ha) and resistant (R) level to pod borer and pod sucker. [ABSTRACT FROM AUTHOR]

Background: Knowledge about genetic parameters can help plant breeders to determine which selection criteria are beneficial. This study aims to estimate the genetic parameters of soybean seed characteristics. Metohds: A total of 91 soybean lines from three different populations were evaluated during dry season in 2016. All genetic material used was grown following a randomized complete block design with two replicates. Soybean pods were harvested after 90% of the leaves had yellowed or fallen. The characteristics of the seeds observed included length, width, thickness and weight of 100 seeds. Result: The results showed that there were two seed shapes (round and ellipse) and two seed sizes (large and medium). There is a broad genetic variability of soybean seed characteristics. Heritability broad sense varies from 0.42 to 0.84, classified as moderate (length-width ratio) to high (length, width, thickness, length-thickness ratio, width-thickness ration and weight of 100 seeds). This therefore shows that there is an opportunity to improve the characters of soybean seeds. The length, width, thickness, ratio of the three characters and the weight of 100 seeds can be used as selection criteria in a soybean breeding program to obtain large-seeded soybeans with a round or elliptical shape. [ABSTRACT FROM AUTHOR]