HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (28) Citing Articles via Google Scholar Google Scholar Articles by Bacanamwo, M. Articles by Purcell, L. C. Search for Related Content PubMed Articles by Bacanamwo, M. Articles by Purcell, L. C. Agricola Articles by Bacanamwo, M. Articles by Purcell, L. C.

Soybean Root Morphological and Anatomical Traits Associated with Acclimation to Flooding

Univ. of Arkansas, Altheimer Lab., Dep. of Agronomy, 276 Altheimer Drive, Fayetteville, AR 72704

^* Corresponding author(purcell{at}comp.uark.edu).

Soybean [Glycine max (L.) Merr.] acclimation to flooding has been investigated at biochemical and physiological levels, but longterm acclimation to flooding may be associated with morphological changes. Supplementing legumes with nitrate ameliorates flooding stress, compared with plants dependent on N₂ fixation. Two experiments evaluated morphological and anatomical changes induced by flooding for plants relying on N₂ fixation or supplemented with nitrate. An additional experiment assessed the role of aerenchyma in flooding acclimation by blocking aerenchyma formation with silver. Flooding soybean for 21 d with nutrient solution without N increased biomass allocation to roots. No aerenchyma was observed in roots of nonflooded plants; however, it was abundant in roots of flooded plants. Porosity measurements of root and stem-base tissues indicated that 10 to 15% of the volume was gas filled in flooded plants, while gasfilled volume was negligible in the nonflooded controls. Flooding in the presence of nitrate decreased aerenchyma and increased adventitious roots, compared with plants flooded with nutrient solution without N. Increased growth under flooding of nitrate-supplemented plants, therefore, was not directly associated with increased root porosity. For flooded plants dependent on N₂ fixation, silver prevented aerenchyma and adventitious root development and decreased biomass accumulation and N₂ fixation by approximately one-half compared with plants flooded in the absence of silver. These results indicate that acclimation to flooding in soybean involves preferential allocation of photosynthates to development of porous adventitious roots and that aerenchyma formation for soybean relying on N2 fixation is critical for acclimation to flooding.

Received for publication April 6, 1998.

This article has been cited by other articles:

				S. Shimamura, S. Yoshida, and T. Mochizuki Cortical Aerenchyma Formation in Hypocotyl and Adventitious Roots of Luffa cylindrica Subjected to Soil Flooding Ann. Bot., December 1, 2007; 100(7): 1431 - 1439. [Abstract] [Full Text] [PDF]

				I. E. Ochoa, M. W. Blair, and J. P. Lynch QTL Analysis of Adventitious Root Formation in Common Bean under Contrasting Phosphorus Availability Crop Sci., May 18, 2006; 46(4): 1609 - 1621. [Abstract] [Full Text] [PDF]

				A. L. THOMAS, S. M. C. GUERREIRO, and L. SODEK Aerenchyma Formation and Recovery from Hypoxia of the Flooded Root System of Nodulated Soybean Ann. Bot., December 1, 2005; 96(7): 1191 - 1198. [Abstract] [Full Text] [PDF]

				L. N. Huynh, T. VanToai, J. Streeter, and G. Banowetz Regulation of flooding tolerance of SAG12:ipt Arabidopsis plants by cytokinin J. Exp. Bot., May 1, 2005; 56(415): 1397 - 1407. [Abstract] [Full Text] [PDF]

				G. BORU, T. VANTOAI, J. ALVES, D. HUA, and M. KNEE Responses of Soybean to Oxygen Deficiency and Elevated Root-zone Carbon Dioxide Concentration Ann. Bot., March 1, 2003; 91(4): 447 - 453. [Abstract] [Full Text] [PDF]