期刊
PLANT PHYSIOLOGY
卷 152, 期 3, 页码 1574-1584出版社
AMER SOC PLANT BIOLOGISTS
DOI: 10.1104/pp.109.151399
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资金
- Ministerie van de Vlaamse Gemeenschap [CLO/IWT/020714]
- Research Foundation-Flanders [G.0350.04N]
- Bijzonder Onderzoeks fonds of Ghent University
Mature indeterminate Medicago truncatula nodules are zonated with an apical meristem, an infection zone, a fixation zone with nitrogen-fixing bacteroids, and a developmental senescence zone that follows nodule growth with a conical front originating in the center of the fixation zone. In nitrogen-fixing cells, senescence is initiated coincidently with the expression of a family of conserved cysteine proteases that might be involved in the degradation of symbiotic structures. Environmental stress, such as prolonged dark treatment, interferes with nodule functioning and triggers a fast and global nodule senescence. Developmental and dark stress-induced senescence have several different structural and expression features, suggesting at least partly divergent underlying molecular mechanisms.
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