Ion micro-distribution in varying aged leaves in salt-treated cucumber seedlings.
Plant Physiol Biochem
; 129: 71-76, 2018 Aug.
Article
em En
| MEDLINE
| ID: mdl-29803075
ABSTRACT
Na+ distribution is one of the most important strategies for plant resistance to salt stress. The way of Na+ compartmentation in different aged leaves has been controversial, especially at the cell and sub-cellular level. The roles that Na+ and K+/Na+ play the key role in photosynthesis need to be further verified. In this study, using two cucumber cultivars Cucumis sativus L. cv. zhongnong 8 (ZN8, relatively salt tolerant) and Cucumis sativus L.cv. Jinchun 4 (JC4, salt sensitive) as experiment material, we analyzed the mode of ion compartmentation of Na+ in organelles in different aged leaves and determined which factors (the organelles' Na+ or K+/Na+) affect leaf photosynthesis, using high-pressure freezing and freeze-substitution, Ultrathin sectioning technique and X-ray. The main results:
1. The sub-cellular trends of Na+ accumulation was cell wallâ¯>â¯vacuoleâ¯>â¯cytoplasmâ¯>â¯chloroplasts; 2. The Na+ accumulation in cytoplasm and chloroplasts was similar in different aged leaves and in seedlings of different salt tolerance cultivars; 3. The K+/Na+ ratio is the main factor that affects the photosynthesis of the same aged leaves in our experiment. A weak capacity for ion compartmentation may be an important reason leading to salt sensitivity.Palavras-chave
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Base de dados:
MEDLINE
Assunto principal:
Sódio
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Folhas de Planta
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Cucumis sativus
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Plântula
Idioma:
En
Ano de publicação:
2018
Tipo de documento:
Article