TAILIEUCHUNG - Comparision of several secondary metabolite and elemental ion contents of leaves from Kandelia obovata and Sonneratia caseolaris forests located in the Red river delta

In this study, we evaluated chemical responses of K. obovata and S. caseolaris through comparisons of the content of metabolites and element ions in leaves of mangrove plants located under different ecological conditions in the Red River delta. In the low salinity area (Thuy Truong), specific leaf areas of K. obovata and S. caseolaris were much lower while the succulent index was higher compared to those in the high salinity area (Kim Trung). | ACADEMIA JOURNAL OF BIOLOGY 2020 42 4 87 99 DOI 2615-9023 COMPARISION OF SEVERAL SECONDARY METABOLITE AND ELEMENTAL ION CONTENTS OF LEAVES FROM Kandelia obovata AND Sonneratia caseolaris FORESTS LOCATED IN THE RED RIVER DELTA Nguyen Thi Ngoc Loan1 Dao Van Tan1 Tran Thi Thanh Huyen1 Nguyen Hong Quang2 Le Thi Van Hue3 Pham Thi Thanh Nga2 Claire Quinn4 Rachael Carrie4 Lindsay C. Stringer4 Chris Hackney5 1 Hanoi National University of Education Ha Noi Vietnam 2 Vietnam National Space Center VAST Vietnam 3 Central Institute for Natural Resources and Environmental Studies VNU Vietnam 4 Sustainability Research Institute School of Earth and Environment University of Leeds Leeds United Kingdom 5 School of Geography Politics and Sociology Newcastle University Newcastle upon Tyne United Kingdom Received 14 May 2020 accepted 25 September 2020 ABSTRACT The two mangrove species Kandelia obovata and Sonneratia caseolaris were widely planted in the Red River delta. Both K. obovata and S. caseolaris forests play an important role in the economic development and environmental protection of the delta. However chemical responses of the common mangrove forests to different ecological conditions in the delta have not yet been described. In this study we evaluated chemical responses of K. obovata and S. caseolaris through comparisons of the content of metabolites and element ions in leaves of mangrove plants located under different ecological conditions in the Red River delta. In the low salinity area Thuy Truong specific leaf areas of K. obovata and S. caseolaris were much lower while the succulent index was higher compared to those in the high salinity area Kim Trung . In Kim Trung both species had a lower ratio of chlorophyll a chlorophyll b. K. obvata in lower light under the S. caseolaris canopy had lower levels of chlorophyll b resulting in a higher Chla chlb ratio. There was no difference in the Mg content of leaves between two areas. An increase in Na .

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