Irrigation intervals affect dhn1 expression and some physiological parameters in stay green and non-stay-green sorghum
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abstract
2018, Connect Journal. Sorghum is very important crop which is mainly used for food, forage, fiber and fuel. It can be exposed to terminal drought, which is a very serious problem for the crop, especially in arid and semi-arid areas. This study has been designed and conducted in order to investigate the effect of three irrigation intervals on dhn1 expression and some physiological parameters in two different sorghum genotypes. The stay green genotype (BT X 632 stay green) showed higher chlorophyll index than RT X 700 non-stay green genotype while lower stomatal conductance has been observed in it in comparison with RT X 700 stay green genotype. Also, lower stomatal conductance has been observed to be increased as irrigation interval increases. BT X 632 stay green genotype showed stability in terms of total yield across all irrigation intervals but it showed lower transcripts content of dhn1 gene in droughted plants in comparison with RT X 700 non-stay green genotype which showed highest dhn1 expression in droughted plants indicating the importance of stay green trait under severely limited water conditions. Further work should be exerted in order to illustrate the role of stay green trait and its relation with drought tolerance genes.
