| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
U.A. INRA Physiologie et Biochimie Végétales, Institut de Recherche en Biologie Appliquée, Université, 14032 Caen Cedex, France
Station d'Ecophysiologie des Plantes Fourragères, INRA, 86600 Lusignan, France
Dep. of Agronomy, Purdue Univ., West Lafayette, IN 47907-1150
* Corresponding author (E-mail: Ourry{at}criuc.unicaen.fr).
Organic reserves in below-ground storage organs are generally recognized as indicators of regrowth and persistence potential of forages. The objective of this experiment was to examine the causal relationships between regrowth potential of alfalfa (Medicago sativa L.) and root organic reserves, i.e., nonstructural carbohydrates or N reserves as N, soluble protein, and vegetative storage protein (VSP). Variations in reserve level induced by cultivar differences (cv. Lodi or Europe), length of the previous regrowth period (30 or 45 d), or by competitive position for light within a dense canopy were studied during 35 d of regrowth. Field grown plants were harvested at weekly intervals, and separated as dominant, intermediate, and suppressed plants. Taproot starch and N contents were influenced by the length of the previous regrowth period, but not by the position of the plant within the canopy. In contrast, soluble protein and VSP concentrations increased when the previous regrowth lengthened from 30 to 45 d and were greater in dominant plants within the canopy. Starch, N, soluble protein, and VSP contents were greater in taproots of Lodi plants. Shoot regrowth was linearly related to taproot soluble protein and VSP contents on the day of defoliation, whereas no relationships was detected between shoot regrowth and initial starch or N contents. These results suggest that root protein and VSP are key organic nutrient for alfalfa shoot regrowth after harvest.
Received for publication June 5, 1996.
This article has been cited by other articles:
|
|
 |
|
  C. Dhont, Y. Castonguay, J.-C. Avice, and F.-P. Chalifour VSP accumulation and cold-inducible gene expression during autumn hardening and overwintering of alfalfa J. Exp. Bot., July 1, 2006; 57(10): 2325 - 2337. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 C. DHONT, Y. CASTONGUAY, P. NADEAU, G. BELANGER, R. DRAPEAU, S. LABERGE, J.-C. AVICE, and F.-P. CHALIFOUR Nitrogen Reserves, Spring Regrowth and Winter Survival of Field-grown Alfalfa (Medicago sativa) Defoliated in the Autumn Ann. Bot., January 1, 2006; 97(1): 109 - 120. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
G. Lemaire, J-C. Avice, T-H. Kim, and A. Ourry Developmental changes in shoot N dynamics of lucerne (Medicago sativa L.) in relation to leaf growth dynamics as a function of plant density and hierarchical position within the canopy J. Exp. Bot., March 1, 2005; 56(413): 935 - 943. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
F. MEURIOT, J.-C. AVICE, J.-C. SIMON, P. LAINE, M.-L. DECAU, and A. OURRY Influence of Initial Organic N Reserves and Residual Leaf Area on Growth, N Uptake, N Partitioning and N Storage in Alfalfa (Medicago sativa) during Post-cutting Regrowth Ann. Bot., August 1, 2004; 94(2): 311 - 321. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 C. Dhont, Y. Castonguay, P. Nadeau, G. Belanger, R. Drapeau, and F.-P. Chalifour Untimely Fall Harvest Affects Dry Matter Yield and Root Organic Reserves in Field-Grown Alfalfa Crop Sci., January 1, 2004; 44(1): 144 - 157. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
C. Dhont, Y. Castonguay, P. Nadeau, G. Belanger, and F.-P. Chalifour Alfalfa Root Nitrogen Reserves and Regrowth Potential in Response to Fall Harvests Crop Sci., January 1, 2003; 43(1): 181 - 194. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
C. Dhont, Y. Castonguay, P. Nadeau, G. Belanger, and F.-P. Chalifour Alfalfa Root Carbohydrates and Regrowth Potential in Response to Fall Harvests Crop Sci., May 1, 2002; 42(3): 754 - 765. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
E. Justes, P. Thiebeau, J.-C. Avice, G. Lemaire, J. J. Volenec, and A. Ourry Influence of summer sowing dates, N fertilization and irrigation on autumn VSP accumulation and dynamics of spring regrowth in alfalfa (Medicago sativa L.) J. Exp. Bot., January 1, 2002; 53(366): 111 - 121. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 B. D. McKersie, J. Murnaghan, K. S. Jones, and S. R. Bowley Iron-Superoxide Dismutase Expression in Transgenic Alfalfa Increases Winter Survival without a Detectable Increase in Photosynthetic Oxidative Stress Tolerance Plant Physiology, April 1, 2000; 122(4): 1427 - 1438. [Abstract] [Full Text]
|
|
| 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 | |||
