Abstract
The development of cortical root aerenchyma and adventitious nodal roots are characteristics of waterlogging-resistant plants. This study reports the relationship of aerenchyma and nodal root development with the Na + exclusion and salt resistance of wheat ( Triticum aestivum) in saline-waterlogged conditions. Two wheat genotypes, SARC-6 and MH-97 were tested in waterlogged, saline and saline-waterlogged conditions for various growth related parameters. Salinity and waterlogging in combination decreased the photosynthetic rate, stomatal conductance and shoot growth more than salinity or waterlogging alone. SARC-6 showed less leaf Na + and more leaf K + concentration and K +:Na + ratio, photosynthetic rate and stomatal conductance than MH-97 in saline, waterlogged as well as saline-waterlogged treatments. The two genotypes differed in their ability to develop aerenchyma and nodal roots both in waterlogged and saline-waterlogged conditions with SARC-6 developing more than MH-97. It is concluded that the formation of aerenchymatous nodal roots improves Na + exclusion and salt resistance of wheat in saline-waterlogged conditions.
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