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

Faiyue, Bualuang, Al-Azzawi, Mohammed J and Flowers, Timothy J (2012) A new screening technique for salinity resistance in rice (Oryza sativa L.) seedlings using bypass flow. Plant, Cell and Environment, 35 (6). pp. 1099-1108. ISSN 0140-7791

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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 50 mm NaCl and 0.2 mm trisodium-8-hydroxy-1,3,6-pyrenetrisulphonic acid (PTS), a bypass flow tracer, for short (4 d) and long (90 d) 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.

Item Type: Article
Keywords: apoplastic transport Na PTS seedling survival sodium accumulation sodium transport reduces sodium uptake crop salt tolerance chlorophyll fluorescence genetic diversity l varieties transport selection genotypes photosynthesis ultrastructure
Schools and Departments: School of Life Sciences > Biology and Environmental Science
Subjects: Q Science > QK Botany > QK0710 Plant physiology
Depositing User: Tim Flowers
Date Deposited: 16 Jan 2014 14:06
Last Modified: 16 Jan 2014 14:06
URI: http://sro.sussex.ac.uk/id/eprint/47366
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