ENHANCING DROUGHT， SALINITY AND COLD TOLERANCE IN PLANTS AND TREES

In alternative embodiments， provided are methods for: enhancing drought tolerance of crop plants and trees， enhancing salinity of tolerance of plants such as crop plants， enhancing early monitoring of drought， salinity and cold stress by plants such as crop plants and trees， enhancing stress resistance in plants such as crop plants and trees， by increasing the expression of or the activity of a Raf-like mitogen-activated protein (MAP) kinase kinase (MAPKK) kinase delta B3 family enzyme (or a Raf-like MAPKK kinase delta B3 family enzyme) (a M3K B3 family enzyme) in a plant or a tree cell or a plant or a tree.

在备选实施方案中，本发明提供如下方法：通过提升植物或林木细胞、植株或林木内类Raf丝裂原活化蛋白激酶激酶激酶（MAPKKK）δB3家族酶（或类Raf MAPKK激酶激酶δB3家族酶，即M3K B3家族酶）的表达量或活性，以实现以下效果：增强农作物与林木的耐旱性；增强农作物等植物的耐盐性；提升对农作物、林木等植物所遭受的干旱、盐胁迫与冷胁迫的早期监测能力；增强农作物、林木等植物的抗逆性。