Morphological and physiological behavior of Casuarina clones under saline environment
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Date
2019
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Punjab Agricultural University, Ludhiana
Abstract
The present investigation was undertaken in Nursery area of Department of Forestry and Natural Resources, Punjab Agricultural University, Ludhiana during the year 2017 to evaluate the growth potential of Casuarina clones under saline environment and understanding the physiological mechanism of salt tolerance. Two months old seedlings of eight Casuarina clones (four clones of Casuarina junghuhniana and four clones of inter-specific hybrids of C. equisetifolia x C. junghuhniana) were transplanted in earthen pots during first week of January. Different concentrations of NaCl viz., 0, 40, 80 and 120 mM were given with irrigation water and continued till the end of experiment. Plant growth of various clones decreased with increase in levels of salinity. At salinity treatment of 120 mM NaCl, clone IFGTB CJ-108 was found to be the most salt tolerant clone as this clone showed the minimum decrease in plant height (51%), collar diameter (49%) and root length (49%) as compared to control i.e. no salinity treatment. Higher tolerance of this clone to the salinity is attributed to the more accumulation of compatible osmolytes as maximum increase in TSS (101%), reducing sugars (89%) and proline content (135%) was observed in this clone at 120 mM as compared to control. On the basis of the morphological and physiological parameters, the sequence of different clones for salt tolerance is IFGTB CJ-108> CH-6> CJ-9> CH-5> CJ-7> CH-1> CJ-10> CH-2.
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