Abstract
Present study is aimed to comparatively investigate the response of two ploidy levels of wheat including a tetraploid (Triticum turgidum L.) and a hexaploid (Triticum aestivum L.) wheat to different durations of flooding stress. Wheat seedlings were exposed to flooding stress for 0, 3, 6 and 9 days. Results showed that all flooding treatments significantly decreased the shoot and root length, and chlorophyll content of both species of wheat. The decrease in chlorophyll content of tetraploid wheat was more than that of hexaploid one. In both species, ADH activity of root was significantly increased under flooding stress, where the increase was more in hexaploid wheat. Flooding stress did not significantly affect root and shoot water content, root porosity, and shoot protein content of any wheat species. Tetraploid and hexaploid wheat used different mechanisms for better tolerance of flooding condition, where tetraploid wheat increased the proline content but in hexaploid wheat, an increase in soluble sugar content was observed.
Highlights
Waterlogging is defined as prolonged soil saturation with water, at least 20 % higher than the field capacity (Aggarwal et al, 2006)
Anaerobic root respiration can induce an accumulation of potentially toxic metabolites such as ethanol, lactic acid, acetaldehyde and cyanogenic compounds
Plants respond to flooding stress by different mechanisms
Summary
Waterlogging is defined as prolonged soil saturation with water, at least 20 % higher than the field capacity (Aggarwal et al, 2006). Since gas diffuses about 4 times more slowly through water than through air, a reduced supply of oxygen during waterlogging may result in halting of growth and survival of many species (Drew, 1997) This is because most tissues of higher plants could not survive under anaerobic condition (Taiz and Zeiger, 2010). 285 - 292 term acclimation including biochemical mechanisms may decrease the negative impacts of flooding (Vartapetian and Jackson, 1997) Some plants such as wetland species are adapted to flooding due to the specialized structures such as aerenchyma and structural barriers to prevent O2 diffusion outward to the soil (Vartapetian and Jackson, 1997; Bacanamwo and Purcell, 1999; Taiz and Zeiger, 2010). Present study aimed to comparatively investigate the response of two ploidy levels of wheat including a tetraploid and a hexaploid wheat to different durations of flooding stress
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