Journal
ECOTOXICOLOGY
Volume 29, Issue 6, Pages 676-683Publisher
SPRINGER
DOI: 10.1007/s10646-020-02203-6
Keywords
Mangrove plants; Slat exclusion; Suberization; Exodermis and endodermis
Categories
Funding
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA23050200, XDA13010500, XDA13020503]
- National Natural Science Foundation of China [41676086, U1901211, 41430966, 41876126]
- National Key Research and Development Plan [2017FY100707]
- International Partnership Program of Chinese Academy of Sciences [133244KYSB20180012]
- Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) [GML2019ZD0305]
- Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences [ISEE2019ZR02, ISEE2018ZD02]
- Natural Science Foundation of Guangdong province [2014A030313783]
- Science and Technology Project of Guangdong province [2016A020222011]
- Guangdong special branch plans young talent with scientific and technological innovation [2016TQ03Z985]
- Guangzhou Science and Technology Project [20171001013]
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Salt tolerance and the possible functions of suberization on salt exclusion and secretion were examined in a dominant mangrove plant, Avicennia marina. The results showed that low salinities (10 parts per thousand and 20 parts per thousand) almost has no negative effect on A. marina, however significant growth inhibitions were observed in the seedlings grown in higher salinities (30 parts per thousand and 40 parts per thousand). With the increases of salinity, increased tissue Na+ content and enhanced salt secretion by glands were observed. Obvious suberization thickening were detected both in the exodermis and endodermis of the roots after salt pretreatment when compared to the roots without salt treatment. More importantly, the present data further confirmed that these root apoplastic barriers would directly decrease Na+ loading into xylem. Higher salt tolerance was observed in the seedlings pre-cultivated by salty tide when compared to fresh water cultivated A. marina. In summary, this study suggests a barrier property of suberization in dealing with salt exclusion in mangroves, a moderate salt pre-treatment may benefit plant withstanding high salinity.
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