Does Mechanical Damage on Soybean Induces the Production of Flavonoids?

Plants respond to grazing by producing chemical defense compounds such as protease inhibitors and secondary metabolites such as flavonoids, making them less palatable for feeding and negatively affecting the physiology of insects. The purpose of this study was to assess the phytochemical response of soybean cultivars Glycine max resistant (IAC-17, IAC-24) and susceptible (IAC-P1) to insects after mechanical damage. These cultivars were mechanically injured, and after 24 HPLC was used to identify and quantify flavonoids in plant samples for several hours. The flavonoids daidzein, quercetin, and rutin were measured, with daidzin having the highest concentration. soybean cultivars after mechanical damage. Rutin was biosynthesized by IAC-24. The cultivars IACPL1, IAC-17, and IAC-24 did not show a flavonoid response to mechanical damage. Flavonoids are not produced by mechanical damage in soybean cultivars.

Author(s) Details

Neilier Rodrigues da Silva Júnior
Department of Biochemistry and Molecular Biology, Laboratory of Enzymology, Protein and Peptide Biochemistry, BIOAGRO/INCT-IPP, Universidade Federal de Viçosa, Viçosa, Brazil.

Rafael Almeida Barros
Department of Biochemistry and Molecular Biology, Laboratory of Enzymology, Protein and Peptide Biochemistry, BIOAGRO/INCT-IPP, Universidade Federal de Viçosa, Viçosa, Brazil.

Yaremis Beatriz Meriño-Cabrera
Department of Biochemistry and Molecular Biology, Laboratory of Enzymology, Protein and Peptide Biochemistry, BIOAGRO/INCT-IPP, Universidade Federal de Viçosa, Viçosa, Brazil.

Maria Goreti de Almeida Oliveira
Department of Biochemistry and Molecular Biology, Laboratory of Enzymology, Protein and Peptide Biochemistry, BIOAGRO/INCT-IPP, Universidade Federal de Viçosa, Viçosa, Brazil.

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Genetic Inheritance of Black Seed Coat in Soybean

The standard phenotype of R gene is black hilum on black seed. The genetic control of several
soybean (Glycine max L. Merr.) natural variants has not been studied. The genetic type T16 is the
only occurrence with brown hilum on black seed coat. The aim of this chapter is to further a
discussion the genetic control of seed black seed coat in soybean. The commercial cultivars Bragg,
BR13 and BR6 present yellow seeds, their natural variants Bragg P and BR13P present black seed
color and BR6M, LCV91-26 brown seed color. T16 was combined with these genotypes and it was
found that the genetic control of the brown hilum trait in black seed coat of the T16 genotype was
controlled by two loci segregating independently and controlling the expression of the color of the
hilum and the seed coat color. The expression of the brown hilum trait in black seed coat is dependent
on locus T_, which controls pubescence color; therefore it occurs only in genotypes with tawny brown
pubescence (T_). Novel black soybean cultivars, breeding for specific characteristics, selected for direct
use could, more suitable for human consumption will increase opportunities for exploring the global
market of health and functional food industry and contribute as food source of both calorie and
protein to combating hunger in undeveloped countries.

Author (s) Details

Valeria Carpentieri-Pipolo
Embrapa Trigo, Rodovia BR-285, Km 294, 99050-970, Passo Fundo, Rio Grande do Sul, Brazil.

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