Abstract
In order to determine the impact of polyamines on the yield-related parameters of rice (Oryza sativa L.) exposed to NaCl, the plants belonging to a salt-sensitive cultivar I Kong Pao were maintained from the young seedling stage until harvest on nutrient solutions containing 0 or 30 mM NaCl in the presence or absence of 10 μM putrescine (Put), 10 μM spermidine (Spd) or 10 μM spermine (Spm). Exogenous Put and to a lesser extent exogenous Spd improved growth and yield of salt-treated plants in relation to an increase in K+/Na+ ratio of shoots and roots as compared to plants exposed to NaCl in the absence of exogenous polyamines. Exogenous Put also improved the net CO2 assimilation, at least partly as a consequence of an increase in the stomatal conductance. Yield increase of salt-treated plants exposed to Put was related to an improvement of floral morphogenesis leading to a higher number of fertile tillers per plant and a higher number of spikelets per panicle. Putrescine also improved the pollen viability in salt-treated plants, allowing a higher seed set and thus a higher grain yield per plant. Although polyamines accumulated in the shoots to some extent in response to exogenous application, neither Put nor Spd accumulated in the seeds. In contrast, Spm did not afford any protection of salt-treated plants but was translocated to the seeds during maturation. Seeds with a high internal Spm concentration exhibited delayed germination in the presence of NaCl. These data are discussed in relation to the implication of polyamine in the metabolism and physiology of salt-treated plants.
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Acknowledgements
The authors are grateful to the International Rice Research Institute (IRRI; Manilla) for providing the seeds, to the Secrétariat à la Coopération (Université catholique de Louvain) for the research fellowship of A. Ndayiragije and to B. Van Pee, J. Bar and W. Deprins for their excellent technical assistance.
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Ndayiragije, A., Lutts, S. Long term exogenous putrescine application improves grain yield of a salt-sensitive rice cultivar exposed to NaCl. Plant Soil 291, 225–238 (2007). https://doi.org/10.1007/s11104-006-9188-y
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DOI: https://doi.org/10.1007/s11104-006-9188-y