user: Question: What's the mutated having a patent number of US plant patent 9645?
Columns: ['Date', '"Inventor"', 'Marketed as', 'Mutated From', 'Assignee', 'Habit', 'Pattern', 'Earlier', 'Color', 'Plant Patent Number']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Aug 29, 1989', 'Hiraragi', 'Yataka', 'Fuji', 'Makoto Okada', 'standard', 'stripe', '1 Month', '–', 'US plant patent 7001']
SQL:

assistant: SELECT "Mutated From" FROM "Table" WHERE "Plant Patent Number" = 'US plant patent 9645';