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한국식물학회 / v.45, no.1, 2002년, pp.28-36 
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( NaCl Stress Causes Changes in Photosynthetic Pigments, Proteins, and Other metabolic Components in the Leaves of a True Mangrove, Bruguiera parviflora, in Hydroponic Cultures ) |
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| 초 록 |
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| We studied salt stress-induced biochemical changes in young, hydroponically grown plants of mangrove, Bruguiera parviflora (Rhizophoraceae). Our focus was on the effect of NaCl (applied at 100,200,400, or 500 mM) on leaf pigments, total soluble proteins, total free amino acids, carbohydrates, polyphenols, and proline. The total Chl context increased for 14 d after treatment with 100 mM NaCl, then gradually stabilized. At 400 mM, the total Chl context slowly decreased over the 45-d test period. however, the Chl a:b ratio remained unchanged in isolated chloroplasts and in leaf tissue. Percent changes in the carotenoids content followed the sam trend as for Chl, except for a 1.5-fold decrease during the 400-mM NaCl treatment, compared with the control. The total sugar content increased by 2.5-fold by Day 45 after treatment with 400 mM NaCl, whereas the starch content measured in the same treatment decreased by 40 to 45%. Leaf protein content decreased as salinity increased, which suggests either a possible disruption in the protein synthesis mechanism or, more likely, an increase in proteolytic activity. The total amino-acid pool increased steadily, by four-fold, in the 45-d, 400-mM treatment. Both proline and polyphenols accumulated will increasing levels of salinity, which confirms the role of proline as a stress-induced protective metabolite in the adaplive process of this species. Our results showed that a true mangrove such as B. parviflora can easily be sustained and propagated under low-salinity conditions. At high levels of salinity (∼400 mM, beyond which they could not survive the plants became adapted to salt stress after two to three weeks. During this adaptive periods changes in pigment and protein levels also occurred. The accumulation of proline and polyphenols played a key role in the plant's stress-induced adjustment to NaCl under hydroponic culture conditions. |
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| 키워드 |
| Bruguiera parviflora;hydroponic culture;mangrove;proline accumulation;salt-stress; |
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Journal of Plant Biology / v.45, no.1, 2002년, pp.28-36
한국식물학회
ISSN : 1226-9239
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200211921054766)
언어 : 영어 |
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| 논문 제공 : KISTI 한국과학기술정보연구원 |
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