Effects Of NaCl On Growth And Nutrient Absorption Of Oats (Avena Sativa L.) Seedlings

The effects of NaCl stress on growth and nutrient absorption of oats variety Neinong-1 seedling were studied under hydroponics culture conditions, as wheat variety Nongmai-2 compared,comparing growth and nutrient absorption characteristics of the two kinds of crops under NaCl stress.The results showed that1.NaCl at low concentrations (40 mmol/L) increased oats and wheat growth,while NaCl at 60 mmol/L for wheat and 80 mmol/L for oats significantly decreased plant height and biomass,and the higher decrements occurred in wheat,so oats variety Neinong-1 was more salt-resistant at the seedling stage.2.NaCl stress reduced nitrate contents in shoots and NR activities in leaves and the concentration of N in plants of oats and wheat,but increased P concentration in oats and wheat;reduced K⁺,Ca²⁺concentrations sharply;nutrient absorption was more affected in wheat variety Nongmai-2 than in oats variety Neinong-1 under NaCl stress.3.Under salt stress, Na⁺ and Cl- content accumulated mainly in shoots of oats and wheat,and increased in all of organs with NaCl concentration increasing; the ratios of increment of Na⁺and Cl- contents were higher in oats than wheat at the same NaCl concentration.4.NaCl stress reduced K⁺/ Na⁺, Ca²⁺/Na⁺ ratios in both oats and wheat,and the decreasing amplitude was greater in wheat,and the ratios of K⁺/ Na⁺ were higher in oats than wheat under the same NaCl stress.With increasing salinity,the decline of SK/Na(absorption) occurred in wheat, but increment occurred in oats. SK/Na (transportation) and SCa/Na (transportation) increased and SCa/Na (absorption) decreased in wheat and oats,but the higher decrements occurred in wheat.