Melatonin Increases Drought Resistance through Regulating the Fine Root and Root Hair Morphology of Wheat Revealed with RhizoPot

Melatonin application has obvious improving effects on alleviating the drought-induced inhibition of plant growth. However, root phenotypic dynamics in wheat treated with melatonin remain unknown. This study was conducted using RhizoPot, a novel and improvised situ observation device, three treatments, including normal water condition (CK), drought (Ds, relative content 45–50%), 100 µM treatment under (MT). Results showed that MT effectively improves morphological indicators, (specific root) length, surface area, volume; length density; average diameter plants. Also, inhibitory effect shoot morphology, height, dry weight, net photosynthesis, stomatal aperture leaves, were improved significantly through condition. Life span percent survival fine root, lateral hair at different segments also treatment. Compared those shown CK Ds, contents leaves roots increased, expression levels melatonin-synthesis-related genes (TaCOMT TaTDC) upregulated The findings this may clarify resistance mechanism stress.