Natural resistance to late blight of potato is present in

Solanum tuberosum

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Solanum acaule

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S. demissum

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S. stoioniferum

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Solution

The correct option is D S. demissum
Complete destruction of the potato crop by late blight (Phytophthora infestans) caused the 'Irish potato famine' in the middle of the 19th century, led to the search for resistant plants. Single genes for resistance to late blight (R genes) were discovered nearly 100 years ago in S. demissum, a wild potato species indigenous to Mexico.
So, the correct answer is 'S. demissum'

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