Photoperiodism was first observed in

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(B) Garner and Allard $(1920)$ first observed photoperiodism in 'Maryland Mammoth',a variety of tobacco ($Nicotiana$ $tabacum$).They discovered that t

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Maryland Mammoth

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(B) Garner and Allard $(1920)$ first observed photoperiodism in 'Maryland Mammoth',a variety of tobacco ($Nicotiana$ $tabacum$).They discovered that this plant could be induced to flower in summer by reducing the duration of light exposure through artificial darkening.Conversely,it could be kept in a vegetative state during winter by providing supplemental light.This discovery established the concept of photoperiodism,which is the response of plants to the relative lengths of light and dark periods.

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