
Differential expression profiles of poplar MAP kinase kinases in response to abiotic stresses and plant hormones, and overexpression of PtMKK4 improves the drought tolerance of poplar
Keywords: ABA, abscisic acid; DREB, dehydration-responsive element binding; JA, jasmonic acid; MAPK, mitogen-activated protein kinase; MAPKK, MAP kinase kinase; MAPKKK, MAP kinase kinase kinase; WPM, woody plant medium; POD, peroxidase; qRT-PCR, quantitative real-t