Soybean is one of the most valuable and profitable oil crop species and a thorough knowledge of the genetic structure of this crop is necessary for developing the best breeding strategies. In this study, a representative collection of soybean cultivars recommended for farming in all Brazilian regions was genotyped using 27 simple sequence repeat (SSR) loci. A total of 130 alleles were detected,...

To evaluate the extent of the genetic change and its effects on the seed protein composition of soybean cultivars released during the past 60 years, representative ancestral cultivars and those derived from selective breeding were grown in a side-by-side comparison. Total seed protein content, determined by combustion analysis of nitrogen, revealed a decline in the protein content after decades...

Soybean [Glycine max (L.) Merr.] is an important crop rich in vegetable protein and oil, and is a staple food for human and animals worldwide. However, soybean plants have been challenged by soybean cyst nematode (SCN, Heterodera glycines), one of the most damaging pests found in soybean fields. Applying SCN-resistant cultivars is the most efficient and environmentally friendly strategy to mana...

The common cutworm (CCW; Spodoptera litura Fabricius) is a serious herbivorous insect pest of soybean (Glycine max) in Asia and Oceania. Previously, we identified quantitative trait loci (QTLs) for CCW-antibiosis-resistance, CCW-1 and CCW-2, and antixenosis-resistance, qRslx1 and qRslx2, in the cultivar 'Himeshirazu'. The effects of these QTLs are useful in the breeding of CCW-resistant cultiva...

The effect o f paraq u a t on hydroxyl radical production , glutathione and ascorbate content, and glutathione reductase and superoxide dism utase activities was assayed in the to lerant “K w angkyo” and the susceptible “ H o o d ” cultivars o f soybean [Glycine max (L.) Merr.]. Seed­ lings o f both cultivars a t the fully expanded first trifoliate leaf stage were treated with paraquat at 0, 1,...

We have used cDNA microarray analysis to examine changes in gene expression during embryo development in soybean (Glycine max) and to compare gene expression profiles of two soybean cultivars that differ in seed isoflavonoid content. The analysis identified 5,910 genes that were differentially expressed in both soybean cultivars grown at two different locations for two consecutive years in one ...

improvements on the efficiency of the embryogenic culture system and reduced culture time have been reA total of 15 soybean [Glycine max (L.) Merr.] cultivars representported (Samoylov et al., 1998a, 1998b; Santarém et al., ing maturity groups 00 to VIII were assessed for their embryogenic and transformation potentials. All cultivars were identified as embryo1998; Santos et al., 1997), this sys...

We used native polyacrylamide gel electrophoresis to identify polymorphism levels in α- and β-esterase loci from leaf tissues of Brazilian soybean cultivars for the analysis of population genetic diversity and structure, and to investigate relationships between conventional and genetically modified cultivars. The cultivars included lines developed by a soybean-grower cooperative (CD), by ...

Peroxidase activity in the seed coats of soybean (Glycine max [L.] Merr.) is controlled by the Ep locus. We compared peroxidase activity in cell-free extracts from seed coat, root, and leaf tissues of three EpEp cultivars (Harosoy 63, Harovinton, and Coles) to three epep cultivars (Steele, Marathon, and Raiden). Extracts from the seed coats of EpEp cultivars were 100-fold higher in specific act...

cated that soybean PIs may have alleles for enhanced seed yield. Improving seed yield of soybean [Glycine max (L.) Merr.] is an Molecular marker analysis can aid in the discovery important breeding goal. The objective of this study was to evaluate and mapping of QTL associated with beneficial and two soybean PIs as sources of alleles for the enhancement of seed novel alleles from exotic parents...