GSE133921
The spatial differences of root apex contribute to improved drought tolerance as induced by drought priming in wheat
Drought priming is a promising approach to improve drought tolerance, and root apex plays important role in coping with drought adversities in plants. It has been observed that less inhibition of root growth under drought stress was found in paralleling with the enhanced drought tolerance induced by drought priming in wheat. However, the contribution and mechanisms of root apex to the improved tolerance induced by drought priming remains unknown. Here, the transcriptome and proteome of three different zones along the root axis under drought stress were investigated. The two zones distal from the root apex showed more sensitive to drought priming and the later drought stress than the zone proximal to the root apex, as exemplified by the principal component analysis of the different expressed genes (DEGs) among treatments. The DEGs which decreased by drought stress, while higher expressed in primed plants than non-primed plants, might play critical roles in enhanced root growth in primed plants. These genes were mainly involved in the pathways related to cell membrane sensing, plant hormone signaling, stress defense and cell more modification. Moreover, the plant hormone pathway showed positive correlated between transcriptome and proteome analysis, and genes network analysis hinted that ABA receptor and aquaporin could be potential markers in regulation of priming induced root growth and drought stress tolerance. Overall design: The different zones of root apex were dissected under a computer visual assistant anatomic microscope.The transcriptome of three different zones along the root axis under drought stress were investigated