The invention discloses application of a tomato
gene SlZFP2 as a negative regulation factor in regulation of
plant cold resistance, belongs to the technical field of
plant genetic engineering, and finds and confirms that the tomato
zinc finger
protein gene SlZFP2 is a key negative regulation factor of
plant cold resistance for the first time. Experiments show that the expression of the SlZFP2 is induced by low temperature, the overexpressed transgenic tomato plant shows more serious
cold injury symptoms under low
temperature stress, the
photosynthetic efficiency is reduced,
active oxygen (H2O2 and O2-) is excessively accumulated, and the activity of
antioxidant enzymes (SOD, POD and CAT) is weakened; the overexpression of the SlZFP2 can inhibit the
biosynthesis and
signal transduction of
abscisic acid (ABA), and down-regulate the expression of cold response genes SlGRAS4 and SlCBF1; based on the discovery, the invention provides an application of using the SlZFP2
gene or an expression product thereof as a
molecular marker for screening tomato materials with different
cold resistance, creating a transgenic plant with reduced cold resistance by overexpressing the SlZFP2, and providing a
recombinant DNA construct containing an SlZFP2 coding sequence and a host
cell.