Sugarcane-stalk=sugar-content-related marker and the use thereof

A method for producing a sugarcane line having an increased stalk sugar content comprising:

• a step of extracting a chromosome of a progeny plant obtained from parent plants, at least one of which is sugarcane;
• and a step of determining the presence or absence of a sugarcane-stalk-sugar-content-related marker in the obtained sugarcane chromosome, wherein said sugarcane-stalk-sugar-content-related marker consists of a continuous nucleic acid region existing in a region sandwiched between the nucleotide sequence shown in SEQ ID NO:
• 1 and the nucleotide sequence shown in SEQ ID NO:
• 8, or a region sandwiched between the nucleotide sequence shown in SEQ ID NO:
• 9 and the nucleotide sequence shown in SEQ ID NO:
• 16, of a sugarcane chromosome.