Abstract
Nitrogen (N) resorption from senescing leaves enables plants to reuse N, making them less dependent on current N uptake from the environment, leading to higher fitness, particularly under low N supply. Species that form a symbiotic association with N2-fixing bacteria have not evolved proficient N resorption, i.e., they retain more N in the senesced leaves than non-N2-fixing species. However, the physiological mechanism underlying the difference is still unknown. Metabolic and structural protein contents in green and senesced leaves, as well as protein degradation during leaf senescence—a critical initial process for subsequent N resorption—were determined in four N2-fixing legumes and in four non-N2-fixers. The metabolic proteins were highly degraded in legumes and to a lesser extent in nonlegumes. Nonetheless, legumes retained more metabolic proteins in their senesced leaves than nonlegumes, because symbiotic N2 fixation improved the metabolic protein content in green leaves. Symbiotic N2 fixation did not change the structural protein content in green leaves. The structural proteins were moderately degraded in nonlegumes, and almost undegraded in legumes, and more structural proteins remained in the senesced leaves of legumes than in those of nonlegumes. The higher metabolic and structural protein contents in the senesced leaves of N2-fixing legumes properly explained the less proficient N resorption. This is an important step in unraveling molecular mechanisms of different N conservation strategies among plant functional types.
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Abbreviations
- [P MET,GR]:
-
Metabolic protein content in green leaf
- [P MET,SE]:
-
Metabolic protein content in fully senesced leaf
- [P STR,GR]:
-
Structural protein content in green leaf
- [P STR,SE]:
-
Structural protein content in fully senesced leaf
- P D,MET :
-
Proportion of the metabolic proteins degraded during leaf senescence
- P D,STR :
-
Proportion of the structural proteins degraded during leaf senescence
- m :
-
Mass loss correcting factor (i.e., senesced leaf mass/green leaf mass)
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Acknowledgements
We thank Noriyuki Osada and Tomoki Tanaka for experimental protocols and advice; we also thank Syunki Harigai for assisting with the measurements reported here; and Ülo Niinemets and two anonymous reviewers for exceptionally helpful comments on the manuscript.
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Support for this work was provided by JSPS KAKENHI Grant number 17K07554.
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RT and SO designed the research. RT and SM performed the experiments and acquired the experimental data. All authors contributed to the interpretation of the data, reviewed and approved the final manuscript.
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Tanabe, R., Miyazawa, SI., Kitade, O. et al. Effect of symbiotic N2 fixation on leaf protein contents, protein degradation and nitrogen resorption during leaf senescence in temperate deciduous woody species. Oecologia 200, 79–87 (2022). https://doi.org/10.1007/s00442-022-05264-y
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DOI: https://doi.org/10.1007/s00442-022-05264-y