Assessing the contribution of glycinebetaine to environmental stress tolerance in sorghum
2000
Mickelbart, M.V. | Ejeta, G. | Rhodes, D. | Joly, R.J. | Goldsbrough, P.B. (Purdue University, Indiana (USA))
Sorghum genotypes differ in the amount of glycinebetaine, a compatible osmotic solute, they accumulate under osmotic stress. To examine the contribution of glycinebetaine to osmotic stress tolerance, a recombinant inbred population has been developed from parents that contrast for glycinebetaine accumulation. Analysis of this population indicates that a single major gene conditions glycinebetaine accumulation and that modifiers affect the final level of this compound. This population is being used to map the genes responsible for variation in glycinebetaine content. Near isogenic lines have been developed that either accumulate or lack glycinebetaine. Analysis of these lines, as well as the segregating population, is in progress to evaluate the impact of this solute on tolerance of sorghu11l to a number of environmental stresses.
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