$Nicotiana{\rm{ }}sylvestris$ flowers only during long days and $N.tabacum$ flowers only during short days, if raised in the laboratory under different photoperiods, they can be induced to flower at the same time and can be cross fertilized to produce self-fertile offspring. What is the best reason for considering N. sylvestris and N. tobaccum to be separate species?Failed to load question data. Please try again later.
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