Effect of Soil Amendment on Growth and Physiological Processes of Rocket (Eruca Sativa L.) Grown under Salinity Conditions
Australian Journal of Basic and Applied Sciences, Vol. 10(1), Pp. 15-20, January 2016
6 Pages Posted: 6 Jun 2016
Date Written: January 1, 2016
Plants of rocket (Eruca sativa L.) grown in pots filled with three types of mixed substrates, (i) 100% soil (S), (ii) 50% soil 50% sand (SS), and (iii) 50% soil 25% sand 25% peat moss (SSP), by volume. The pots were watered daily with two different levels of salinity, (a) fresh water (0 mM NaCl) and (b) salt water (40 mM NaCl). The results showed that salinity led to a decrease of fresh weight (FW) production and relative water content (RWC), while specific leaf weight (SLW) was increased. No significant differences in dry weight (DW) and chlorophyll fluorescence parameters of stressed plants. Modifying substrate (SSP) led to maintain plant growth under salinity condition, whereas the substrate texture was ameliorated to more porosity and permeability. The salinity enhanced an increase in the Na and Cl- accumulation of plant with different types of substrate treatments. While, the SSP substrate type showed a reduce in Cl- accumulation under salinity treatments. However, the reduction in growth under NaCl treatment can be attributed to an accumulation of salts thereby decrease in osmotic potential with respect of toxicity from NaCl. Despite the parameters indicate to reduce the growth under salinity, the plant biomass was maintained with SSP substrate type. Our overall results indicate that the soil amendment would ameliorate the ability of plant from inhibitory effects of NaCl stress in plants by reduce Cl- accumulation thereby enhance plant tolerance.
Keywords: Eruca Sativa L., Soil Amendment, Substrate, Salinity, NaCl
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