Occurrence of putrescine in potassium-deficient barley.
F. J. Richards,R. G. Coleman +1 more
TLDR
The fact that in barley, at least, putrescine is produced and accumulated under certain conditions of potassium deficiency, and that some of the observed symptoms may well be directly attributable to its presence, is directed to.Abstract:
THE identification of primary effects of potassium in plant cells has proved to be one of the most elusive problems in mineral nutrition. Many widespread physiological disturbances accompanying potassium deficiency are well known, especially in the fields of nitrogen and carbohydrate metabolism; but the immediate causes of the characteristic (yet variable) leaf symptoms and the premature death of foliage have been almost entirely a matter for speculation. This communication is intended to direct attention to the fact that in barley, at least, putrescine is produced and accumulated under certain conditions of potassium deficiency, and that some of the observed symptoms may well be directly attributable to its presence.read more
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Polyamines and environmental challenges : recent development
TL;DR: All the data support the view that putrescine and derived polyamines (spermidine, spermine, long-chained polyamides) may have several functions during environmental challenges.
Journal ArticleDOI
Polyamines: molecules with regulatory functions in plant abiotic stress tolerance
Rubén Alcázar,Teresa Altabella,Francisco Marco,Cristina Bortolotti,Matthieu Reymond,Csaba Koncz,Pedro Carrasco,Antonio F. Tiburcio +7 more
TL;DR: The integration of polyamines with other metabolic pathways is discussed by focusing on molecular mechanisms of their action in abiotic stress tolerance by integrating with processes of reactive oxygen species (ROS) signalling, generation of nitric oxide, modulation of ion channel activities and Ca2+ homeostasis.
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Polyamines and abiotic stress: recent advances.
TL;DR: Information is summarized about the involvement of polyamines as antioxidants against the potential abiotic stress-derived oxidative damage and other types of abiotic stresses, such as mineral deficiencies, chilling, wounding, heavy metals, UV, ozone and paraquat, where polyamine metabolism is also modified.
Journal ArticleDOI
Polyamines in plant physiology.
TL;DR: The application of exogenous polyamines produces effects on patterns of senescence and morphogenesis, suggesting but not proving a regulatory role for polyamines in these processes, although most recent work suggests an adaptive, protective role.
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Modulation of the polyamine biosynthetic pathway in transgenic rice confers tolerance to drought stress
TL;DR: It is demonstrated clearly that the manipulation of polyamine biosynthesis in plants can produce drought-tolerant germplasm, and a model consistent with the role of polyamines in the protection of plants against abiotic stress is proposed.