De novo protein synthesis in relation to ammonia and proline accumulation in water stressed white clover

Functional Plant Biology : FPB
Tae-Hwan KimAlain Ourry

Abstract

The kinetics of protein incorporation from newly-absorbed nitrogen (N, de novo protein synthesis) was estimated by 15N tracing in 18-week-old white clover plants (Trifolium repens L. cv. Regal) during 7 d of water-deficit treatment. The physiological relationship between kinetics and accumulation of proline and ammonia in response to the change in leaf-water parameters was also assessed. All leaf-water parameters measured decreased gradually under water deficit. Leaf and root dry mass was not significantly affected during the first 3 d when decreases in leaf-water parameters were substantial. However, metabolic parameters such as total N, proline and ammonia were significantly affected within 1 d of commencement of water-deficit treatment. Water-deficit treatment significantly increased the proline and NH3-NH4+ concentrations in both leaves and roots. There was a marked reduction in the amount of N incorporated into the protein fraction from the newly absorbed N (NANP) in water-deficit stressed plants, particularly in leaf tissue. This reduction in NANP was strongly associated with an increased concentration of NH3-NH4+ in roots (P≤0.05) and proline (P≤0.01) in leaves and roots. These results suggest that proline accumulation m...Continue Reading

References

Sep 24, 1982·Science·P H YanceyG N Somero
Mar 22, 2000·Environmental and Experimental Botany· Costa França MGD Laffray
Oct 1, 1984·Plant Physiology·M AslamD W Rains

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Citations

Apr 4, 2021·International Journal of Molecular Sciences·Verónica Castañeda, Esther M González
Aug 18, 2006·Colloids and Surfaces. B, Biointerfaces·Hong-Bo ShaoJiang-Feng Cheng

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