Adaptation of barley roots to hypoxic condition
2000
Meechoui, S.(Rajamangala Institute of Technology. Lampang Campus, Lampang (Thailand). Lampang Agricultural Research and Training Center) | Senthong, C.(Chiang Mai University, Chiang Mai (Thailand). Faculty of Agriculture. Department of Agronomy)
Oxygen deficiency in barley root system (hypoxia) at 3-4 leaf stage is an important problem of barley production in paddy field. Three different hypoxia tolerance barley genotypes, SMG1, FNBLS no.140 and BRBRF9629, were used for investigate root growth and morphological changes. Each genotypes were grown in stagnant agar nutrient solution (as hypoxic condition) and aerated nutrient solution (as control) in plant growth chambers. This experiment was carried out at Lampang Agricltural Research and Training Center during March 1999-April 1999. Results showed that hypoxia enhanced the nodal root/plant of all barley genotypes. Total root length/plant of all genotypes slowly increased under hypoxia and was dropped at the end of the experiment. Internal ethylene and aerenchyma formation were produced in the roots at 5 days after hypoxia. High internal ethylene in the roots was produced at 7-9 days after hypoxia and also increased the aerenchyma formation in the roots. FNBLS no.140 and BRBRF9629 genotypes had immediately alcohol dehydrogenase (ADH) activity when hypoxia started and then declined after aeremchyma enlargement. SMG1, hypoxia tolerance genotype, was low in ADH activity but have much less the percentage of aerenchyma formation and also had slightly increased in total root length/plant during the beginning of hypoxic. FNBLS no.140 genotypes could be better adapted to hypoxia than BRBRF9629 genotype by have a higher internal ethylene and ADH activities whereas BRBRF9629 genotypes had a quick response in root morphological adaptation.
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