Mitogen-activated protein kinase (MAPK) cascades， which consist of three functionally associated protein kinases， namely MEKKs， MKKs and MPKs， are universal signaling modules in all eukaryotes and have been shown to play critical roles in many physiological and biochemical processes in plants. However， little or nothing is known about the MPK and MKK families in watermelon.
Mitogen-activated protein kinase (MAPK) cascades， which consist of three functionally associated protein kinases， namely MEKKs， MKKs and MPKs， are universal signaling modules in all eukaryotes and have been shown to play critical roles in many physiological and biochemical processes in plants. However， little or nothing is known about the MPK and MKK families in watermelon.
