International Journal on Advanced Science, Engineering and Information Technology, Vol. 4 (2014) No. 2, pages: 54-59, DOI:10.18517/ijaseit.4.2.367

Growth and Physiological Response of Jatropha Interspecific Hybrid (Jatropha curcas x J. integerrima) under Salt Stress

Dhimas Handhi Putranto, Teerawat Tongkra, Cattleya Chutteang, Weeraphan Sridokchan

Abstract

Interspecific hybrid of Jatropha curcas x J. integerrima is expected to answer the low oil yield problem of Jatropha (Jatropha curcas L.). However, as a novel invention, research concerning on Jatropha interspecific hybrid is still limited especially in the aspect of its adaptability to unfavorable environment such as salt stress condition. It is interesting to know how Jatropha interspecific hybrid responses to salt stress condition due to the moderate salt tolerance ability of its mother plant (J. curcas L.). The objectives of this study were to compare the growth and physiological response of interspecific hybrid and non-hybrid Jatropha under salt stress. Three varieties of both interspecific hybrid and non-hybrid Jatropha seedling were exposed with 3 levels of sodium chloride treatment in Hoagland media solution which are 2.0 (control), 8.0, and 16.0 dS m-1 for 7 weeks. The parameters measured include plant height, number of leaves, shoot dry weight, specific leaf area, chlorophyll content (SPAD Index), leaf water potential, and leaf solute concentration. V2 (interspecific hybrid) showed the highest potential as moderate salt tolerant variety among experimental Jatropha varieties due to its increasing trend of leaf number, dry weight, and total leaf area at moderate salinity level   (8 dS m-1). KUBP 35 and KUBP 40 showed the best growth performance under salt stress among experimental Jatropha varieties, but its potential to be moderate salt tolerant variety was still lower than V2 variety. The solute concentration, osmotic potential, and turgor potential of both interspecific hybrid (V2) and non-hybrid variety (KUBP 35 and KUBP 40) showed an increasing pattern which could be implied as an adaptive response to salt stress. This study has showed that Jatropha interspecific hybrid might have an adaptive physiological response to salt stress and could be considered as potential moderate salt tolerant variety under salt stress.

Keywords:

osmotic adjustment; salt tolerance; solute concentration; SPAD; sustainable energy.

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