Method for improving plant drought tolerance, sericin protein working solution and application thereof

An application of a sericin protein working solution in tomato plant cultivation, wherein the sericin protein working solution is configured to improve a drought tolerance of a tomato plant;

• wherein a preparation method of the sericin protein working solution comprises:
• fragmenting silkworm cocoons to obtain fragmented silkworm cocoons, boiling the fragmented silkworm cocoons in distilled water for 10 minutes (min) to 15 min to obtain a sericin protein stock solution;
• diluting the sericin protein stock solution with distilled water to a concentration of 0.1 gram per liter (g/L) to 0.5 g/L, to obtain the sericin protein working solution;
• and an amount ratio of the silkworm cocoons to the distilled water is 5 grams (g) to 10 g:
• 200 milliliters (mL);
• wherein the application comprises:
• spraying the sericin protein working solution onto adaxial surfaces of leaves of the tomato plant when the tomato plant grows to a five-true-leaves and one-heart stage, with a spray volume of 10 mL/plant to 15 mL/plant;
• wherein a spraying timing is set when the tomato plant grows to the five-true-leaves and one-heart stage, the spraying is performed at a time point when a cultivation environment changes from darkness to light;
• and
• wherein the cultivation environment is repeated cycles of 16 hours (h) of light and 8 h of darkness.