Sulphate as a xylem-borne chemical signal precedes the expression of ABA biosynthetic genes in maize roots

Recent reports suggest that early sensing of soil water stress by plant roots and the concomitant reduction in stomatal conductance may not be mediated by root-sourced abscisic acid (ABA), but that other xylem-borne chemicals may be the primary stress signal(s). To gain more insight into the role of...

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