Abstract
Shoot responses to root stress may be modulated by hormones transported from root tissues. In this study, the pattern of in vitro translatable mRNAs from leaves on plants with oxygen-deprived (hypoxic) roots was used as a molecular phenotype to test for the action and specificity of putative root-to-shoot signal molecules. Root hypoxia caused a decrease in the abundance of a group of leaf mRNAs which translated to give low molecular weight (LMW) proteins (12 to 28 kDa). Root excision induced a similar reduction in a subset of the same LMW leaf mRNAs. This suggests that the effects of root hypoxia on leaves are physiologically related to the effects of root excision. Feeding abscisic acid to leaves did not mimic the effects of root aeration or hypoxia
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