A new screening technique for salinity resistance in rice (Oryza sativa L.) seedlings using bypass flow

Abstract

A lack of screening techniques delays progress in research on salinity resistance in rice. In this study, we report our test of the hypothesis that an apoplastic pathway (the so-called bypass flow) causes a difference in salt resistance between rice genotypes and can be used in screening for salinity resistance. Fourteen-day-old seedlings of low- and high-Na +-transporting recombinant inbred lines (10 of each) of rice IR55178 were treated with 50mm NaCl and 0.2mm trisodium-8-hydroxy-1,3,6-pyrenetrisulphonic acid (PTS), a bypass flow tracer, for short (4d) and long (90d) periods of time. The results showed that the average shoot Na + concentration and bypass flow for high-Na +-transporting lines were 1.4 and 2.4 times higher than those of low-Na +-transporting lines, respectively. There was a positive linear correlation between the percentage of bypass flow and Na + concentrations in the shoots, suggesting that the difference in Na + transport in rice is a consequence of different degrees of bypass flow. Moreover, a high correlation was found between bypass flow and seedling survival after prolonged salt stress: the lower the magnitude of bypass flow, the greater the seedling survival. We conclude that bypass flow could be used as a new screening technique for salt resistance in rice. A lack of screening techniques delays progress in research on salinity resistance in rice. In this study, we report that an apoplastic pathway (the so-called bypass flow) causes a difference in salt resistance between rice genotypes and can be used as a new screening technique in screening for salinity resistance. © 2011 Blackwell Publishing Ltd.