EFFECT OF INLAND SALT-AFFECTED SOIL ON PHYSIOLOGICAL AND GROWTH CHARACTERS OF EUCALYPT TREE (EUCALYPTUS CAMALDULENSIS DEHNH.)

S. Cha-um; C. Kirdmanee

doi:10.9755/ejfa.v22i6.4664

Authors

S. Cha-um National Center for Genetic Engineering and Biotechnology(BIOTEC), National Science and Technology Development Agency (NSTDA), 113 Thailand Science Park, Paholyothin Road, Klong Luang, Pathumthani 12120, Thailand
C. Kirdmanee National Center for Genetic Engineering and Biotechnology(BIOTEC), National Science and Technology Development Agency (NSTDA), 113 Thailand Science Park, Paholyothin Road, Klong Luang, Pathumthani 12120, Thailand

DOI:

https://doi.org/10.9755/ejfa.v22i6.4664

Keywords:

chlorophyll a fluorescence, electro conductivity, eucalyptus, growth, net-photosynthetic rate, photosynthetic pigments, salinity

Abstract

Eucalyptus tree is a high potential plant species as a deep root system for water absorption to prevent the salt rise-up, a large bushy to cover the surface area and to detoxify the toxic salt ions. The aim of this research is to investigate the responses of Eucalyptus camaldulensis to different sites of inland salinity. Survival percentage of salt-stressed eucalypt was decreased, relating to salt contamination and negatively correlated with proline accumulation. Water use efficiency in the salt-stressed leaves was negatively related to electro conductivity (EC) values in the salt-affected soil. Chlorophyll a (Chla) and total chlorophyll (TC) degradations were positively related to maximum quantum yield of photosystem II (PSII) (Fv/Fm) (r2=0.89) and quantum efficiency of PSII (?PSII) (r2=0.95), leading to low net photosynthetic rate (Pn) (r2=0.79) and to reduce the growth characteristics in term of plant height and circumstance. The survived eucalypt plants in the severe salinity land containing high salt contamination (1.7-2.0% salt) may be further applied as potential plant species to remediate the inland salinity soil.