Adaptive responses of barley seedlings to hypoxia
2001
Meechoui, S. | Senthong, C. (Lampang Agricultural Research and Training Center, Lampang (Thailand))
Studies on the mechanisms of hypoxia adaptation of barley seedling related to total sugar and nitrogen accumulation in the shoots were carried out at Lampang Agricultural Research and Training Center during March-April 1999. Three different hypoxia tolerant barley genotypes, SMG1, FNBLS no.140 and BRBRF9629, were used to investigate hypoxia adaptation of their seedlings grown in stagnant agar nutrient solution (as hypoxia condition) and aerated nutrient solution (as control) in plant growth chambers. Results revealed two principal steps in their responses. First step was at 0-5 days after hypoxia, the root system survived by increasing alcohol dehydrogenase activity for anaerobic respiration in the roots and nitrate reductase activity in the leaves also increased but lower than the control. The total soluble sugar and nitrogen accumulation in the shoots varied among barley genotypes. In the second step (5-9 days after hypoxia), the photosynthetic rates of all genotypes were increased which depended on the chlorophyll efficiency in leaves. Total soluble sugar in the shoots increased whereas total nitrogen in the shoots decreased. Alcohol dehydrogenase and nitrate reductase activities were different among barley genotypes.
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