geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Allantoin and allantoic acid in the nitrogen economy of the cowpea vigna unguiculata


, : Allantoin and allantoic acid in the nitrogen economy of the cowpea vigna unguiculata. Plant Physiology (Rockville) 62(4): 495-498

The ureides, allantoin and allantoic acid, represented major fractions of the soluble N pool of nodulated plants of cowpea (V. unguiculata [L.] Walp. cv. Caloona) throughout vegetative and reproductive growth. Stem and petioles were the principal sites of ureide accumulation, especially in early fruiting. Labeling studies using 14CO2 and 15N2 and incubation periods of 25-245 min indicated that synthesis of allantoin and allantoic acid in root nodules involved currently delivered photosynthate and recently fixed N, and that the ureides were exported from nodule to shoot via the xylem. From 60-80% of xylem-borne N consisted of ureides; the remainder was glutamine, asparagine and amino acids. Allantoin predominated in the soluble N fraction of nodules and fruits, allantoin and allantoic acid were present in approximately equal proportions in xylem exudate, stems and petioles. Extracts of the plant tissue fraction of N-fixing cowpea nodules contained glutamate synthase (EC 2.6.1.53) and glutamine synthetase (EC 6.3.1.2), but little activity of glutamate dehydrogenase (EC 1.4.1.3). High levels of uricase (EC 1.7.3.3) and allantoinase (EC 3.5.2.5) were also detected. Allantoinase but little uricase was found in extracts of leaflets, pods and seeds. Balance sheets were constructed for production, storage and utilization of ureide N during growth. Virtually all (average 92%) of the ureides exported from roots was metabolized on entering the shoot, the compounds being presumably used as N sources for protein synthesis.

US$29.90

PMID: 16660546


Other references

Noda, J.; Brito, Nélida.; González, C., 2010: The Botrytis cinerea xylanase Xyn11A contributes to virulence with its necrotizing activity, not with its catalytic activity. The Botrytis cinerea xylanase Xyn11A has been previously shown to be required for full virulence of this organism despite its poor contribution to the secreted xylanase activity and the low xylan content of B. cinerea hosts. Intriguingly, xylanase...

Wiersum, L.K., 1964: Sterile culture of excised tomato roots in sands of different grain size. A simple culture technique is described. It was shown that growth of the roots was related to aeration and not to mechanical impedance in sands of different grain size.

Rowell, B.; Nesmith, W.; Snyder, J.C., 1999: Yields and disease resistance of fall-harvested transgenic and conventional summer squash in Kentucky. Virus and fungal disease pressures limit fall production of summer squash (Cucurbita pepo) in Kentucky. Twenty-five summer squash cultivars (nine zucchini, eight yellow straightneck, and eight yellow crookneck entries) were evaluated for marketabl...

Hector, R.F.; Domer, J.E., 1982: Mammary gland contamination as a means of establishing long-term gastrointestinal colonization of infant mice with Candida albicans. This method of obtaining long-term gastrointestinal colonization of mice by C. albicans is less traumatic than intubation and the number of yeasts in systemic spread is minimal. It is suggested as a useful model of gastrointestinal candidosis.

Lass Herb, 1990: Stacked walls preload difficult soil. ENR 224(22): 33

Ales Reinlein, J.M.; Rubio Pérez, P.; Sánchez Sánchez, I.; Lahoz Navarro, F.; Romeo Orbegozo, J.M., 1976: Respiratory nocardiosis. With reference to 5 cases with diverse clinical forms the authors review the general features of the infection.

de Vries, D.H., 2017: Temporal Vulnerability and the Post-Disaster 'Window of Opportunity to Woo:' a Case Study of an African-American Floodplain Neighborhood after Hurricane Floyd in North Carolina. After major flooding associated with Hurricane Floyd (1999) in North Carolina, mitigation managers seized upon the "window of opportunity" to woo residents to accept residential buyout offers despite sizable community resistance. I prese...

Sengbusch, R.V.; Loschakowa, N., 1932: The breeding of lupins (Lupinus luteus) with soft testas. Dr. v. Sengbusch has already been successful in breeding Lupinus strains free from bitter principle (see Herb. Abst. 1. 61. 1931). The present article describes a successful attempt to eliminate by selection forms of Lupinus luteus having soft-coa...

Gillerman Elliot, 1953: White Signal uranium deposits. Pages 133-137 1953

McCurdy, M.W.; Campbell, J.E.; Bohm, C.O.; Trommelen, M.S.; Syme, E.C., 2013: Regional lake sediment geochemical data, Kasmere Lake-Nueltin Lake area, Manitoba NTS 64-K, 64-N, 64-O. Geological Survey of Canada: 17