Role of amides, amino acids, and ureides in the nutrition of developing soybean seeds [Glycine max]

• Published in: Plant physiology (Bethesda) Vol. 74; no. 2; pp. 329 - 334
• Main Authors: Rainbird, R.M, Thorne, J.H, Hardy, R.W.F
• Format: Journal Article
• Language: English
• Published: Rockville, MD American Society of Plant Physiologists 01.02.1984
• Subjects: Agronomy. Soil science and plant productions; Amides; Amino acids; Biological and medical sciences; Economic plant physiology; Embryos; Fundamental and applied biological sciences. Psychology; Metabolism; Metabolism. Physicochemical requirements; Nitrogen; Nitrogen metabolism and other ones (excepting carbon metabolism); Nutrition; Nutrition. Photosynthesis. Respiration. Metabolism; Plant physiology and development; Plants; Solutes; Soybeans; Testa; Xylem; Ripening; Seeds; Leguminosae; Dicotyledones; Angiospermae; Spermatophyta; Nitrogen; Metabolism; Glycine max
• ISSN: 0032-0889; 1532-2548
• DOI: 10.1104/pp.74.2.329

The various nitrogenous solutes important to embryo development in symbiotic soybean plants were determined during the midpodfilling stage. Glutamine was the principal form of nitrogen, contributing 55% of the embryo nitrogen requirement. Asparagine was the second most important, contributing 20%. The ureides allantoin and allantoic acid directly contributed only insignificantly to the total nitrogen requirement of the embryo. These conclusions were based upon analyses of tissue extracts, translocation studies of radiolabeled solutes, analysis of in vivo seed coat exudate collected from the freespace of attached, surgically altered seeds, and the in vitro culture of isolated immature soybean embryos.