| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
a USDA-ARS, and Agronomy Physiology and Genetics Laboratory
b Agronomy Dep., Agronomy Physiology and Genetics Laboratory, Univ. of Florida, P.O. Box 110965, Gainesville, FL 32611-0965
* Corresponding author (trsincl{at}mail.ifas.ufl.edu)
Nitrogen fixation in soybean (Glycine max Merr.) is especially sensitive to soil drying. The basis of this sensitivity appears to be related to the fact that ureides are transported from the nodules, and the ureide concentrations increase with water deficits in leaves resulting in an apparent feedback to nodules involving ureides that inhibit activity. Therefore, sustained ureide catabolism in the leaves under water deficit appears to be critical for N2 fixation tolerance. Recently, eight plant introduction lines were identified that expressed substantial N2 fixation tolerance of water deficits. The focus of this study was to explore the basis for the tolerance previously observed in the eight lines. Specifically, the objective of this study was to evaluate in these genotypes the dependence for ureide catabolism on allantoate amidinohydrolase, which in other cultivars appears to be related to N2 fixation tolerance of water deficits. Since allantoate amidinohydrolase does not require Mn as a co-factor in contrast to the alternate enzyme for allantoic acid catabolism, ureide accumulation was measured in leaves of these genotypes after the plants were fed allantoic acid following growth on low Mn hydroponic solutions. This treatment confirmed that ureide accumulation was independent of Mn nutrition level in six of the eight tolerant lines. Ureide accumulation in PI 429328 was consistently the most insensitive to Mn nutrition level. Overall, these results indicated that ureide catabolism independent of Mn is active in six of the eight plant introduction lines identified to express N2 fixation tolerance to soil drying.
This article has been cited by other articles:
|
|
 |
|
  R. Ladrera, D. Marino, E. Larrainzar, E. M. Gonzalez, and C. Arrese-Igor Reduced Carbon Availability to Bacteroids and Elevated Ureides in Nodules, But Not in Shoots, Are Involved in the Nitrogen Fixation Response to Early Drought in Soybean Plant Physiology, October 1, 2007; 145(2): 539 - 546. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 C. D. Todd, P. A. Tipton, D. G. Blevins, P. Piedras, M. Pineda, and J. C. Polacco Update on ureide degradation in legumes J. Exp. Bot., January 1, 2006; 57(1): 5 - 12. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 J. D. Ray, L. G. Heatherly, and F. B. Fritschi Influence of Large Amounts of Nitrogen on Nonirrigated and Irrigated Soybean Crop Sci., December 2, 2005; 46(1): 52 - 60. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 M. L. IZAGUIRRE-MAYORAL and T. R. SINCLAIR Soybean Genotypic Difference in Growth, Nutrient Accumulation and Ultrastructure in Response to Manganese and Iron Supply in Solution Culture Ann. Bot., July 1, 2005; 96(1): 149 - 158. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
C. A. King and L. C. Purcell Inhibition of N2 Fixation in Soybean Is Associated with Elevated Ureides and Amino Acids Plant Physiology, April 1, 2005; 137(4): 1389 - 1396. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
C. D. Todd and J. C. Polacco Soybean cultivars 'Williams 82' and 'Maple Arrow' produce both urea and ammonia during ureide degradation J. Exp. Bot., April 1, 2004; 55(398): 867 - 877. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
| The SCI Journals | Agronomy Journal | Vadose Zone Journal | |||
| Journal of Natural Resources and Life Sciences Education |
Soil Science Society of America Journal | ||||
| Journal of Plant Registrations | Journal of Environmental Quality |
The Plant Genome | |||
