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The application discloses a dCAPS molecular marker for amplifying a SNP site of a QTL of wheat scab and application thereof in the technical field of molecular biology, is located on the long arm of chromosome 5B of a wheat Chinese spring reference sequence, and a primer pair comprises a forward primer and a reverse primer, and the nucleotide sequences of the forward primer and the reverse primer are shown as SEQ ID NO. 1-2. The molecular marker is closely linked to scab resistance in the application, has high diagnostic accuracy, and can be widely used in assisted breeding of wheat resistant to scab.

The application provides a method for predicting overwintering rate and cold resistance of Brassica napus, and belongs to the technical field of rape cultivation. The method comprises the following steps: sowing seeds of Brassica napus to be evaluated in a field; in early December, after the minimum temperature in the field is lower than-4 DEG C and lasts for 5-10 days, the key indicators of Brassica napus are determined; the determined key indicators are substituted into a regression equation of a linear regression model to calculate the predicted overwintering rate of Brassica napus; and the cold resistance of Brassica napus is identified according to the obtained predicted overwintering rate. Compared with the traditional natural overwintering identification, the application can obtain the predicted overwintering rate by only determining 7 key indicators once before winter, and complete the cold resistance grading evaluation, so that the identification period is shortened.

The present invention provides an electronic expansion valve, which includes: a valve body having an accommodating cavity and a valve port, and the valve port communicates with the accommodating cavity; a guide sleeve, which is disposed in the accommodating cavity; a valve head, which is movably disposed in the guide sleeve and configured for blocking or opening the valve port, and a balance channel is disposed in the valve head so as to enable two ends of the valve head to be communicated; the valve head has a first end and a second end which are oppositely disposed, the first end is configured for blocking the valve port, a refrigerant medium and the first end have a first stress area S1, the refrigerant medium and the second end have a second stress area S2, and -1.3 mm2≤S1-S2≤1.3 mm2. Through the technical solution provided by the present invention, the problem that the reliability of action of an electronic expansion valve in the relevant art is poor may be solved.