| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
a USDA-ARS, U.S. Plant, Soil and Nutrition Lab., Tower Road, Ithaca, NY 14853
b Dep. of Crop and Soil Sciences, Oklahoma State Univ., Stillwater, OK 74078
c Dep. of Plant Breeding, Cornell Univ., Ithaca, NY 14853
d USDA-ARS, Plant Science Research Unit, 411 Borlaug Hall, Univ. of Minnesota, 1991 Upper Buford Circle, St. Paul, MN 55108
* Corresponding author. (garvi007{at}umn.edu)
Aluminum toxicity limits wheat (Triticum aestivum L.) production on acidic soils. The wheat cultivar Atlas 66 reportedly may have both more than one Al tolerance gene and more than one Al tolerance mechanism. The purpose of this study was to identify the Al tolerance mechanisms conferred by the individual Atlas 66 Al tolerance genes present in near-isogenic lines (NILs) of the cv. Century and Chisholm ('Century-T' and ‘Chisholm-T’). Seedling hydroponic culture analysis revealed that the NILs were not as Al tolerant, nor were they able to exclude Al from root apices as effectively as Atlas 66. Al-inducible malate release from root apices was significantly higher in the NILs compared with the recurrent parents, but less than that observed in Atlas 66. In contrast, root phosphate release was significantly lower than previously reported in Atlas 66, with no major differences observed among lines. These results indicate that the Atlas 66 Al tolerance gene present in each NIL acts by increasing Al-inducible malate release from root tips, but confers only a portion of the Al tolerance of Atlas 66 in both instances. Thus, differences in Al tolerance between the NILs and Atlas 66 can be attributed to malate release differences, and not differential phosphate release. Further, these results indicate that genetic variation at more than one locus underlies the malate-mediated Al tolerance differences in Atlas 66, when compared with Century and Chisholm. The Atlas 66 alleles for these loci have not been introgressed into the NILs.
Abbreviations: ICP-ES, axial inductively coupled argon plasma atomic emission spectrometry • NIL, near-isogenic line • RRG, relative root growth
Related articles in Crop Science:
This article has been cited by other articles:
|
|
 |
|
  S. K. Kariuki, H. Zhang, J. L. Schroder, J. Edwards, M. Payton, B. F. Carver, W. R. Raun, and E. G. Krenzer Hard Red Winter Wheat Cultivar Responses to a pH and Aluminum Concentration Gradient Agron. J., January 1, 2007; 99(1): 88 - 98. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 J. V. Magalhaes Aluminum tolerance genes are conserved between monocots and dicots PNAS, June 27, 2006; 103(26): 9749 - 9750. [Full Text] [PDF]
|
|
|
|
 |
|
 A. A. Hopkins, D. P. Malinowski, H. Zhang, and D. W. Walker Russian Wildrye Seedlings Are Sensitive to Acidic Soil Crop Sci., November 1, 2004; 44(6): 2187 - 2192. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 D. A. Watt Aluminium-responsive genes in sugarcane: identification and analysis of expression under oxidative stress J. Exp. Bot., April 1, 2003; 54(385): 1163 - 1174. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
| The SCI Journals | Agronomy Journal | Vadose Zone Journal | |||
| Journal of Plant Registrations | Soil Science Society of America Journal | ||||
| Journal of Natural Resources and Life Sciences Education |
Journal of Environmental Quality |
||||
