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Importance of day length in flowering of plants was first shown in:
A
Cotton
B
Petunia
C
Lemna
D
Tobacco
Detailed Solution
The response of plants to the relative lengths of day and night, especially with regard to flowering, is called photoperiodism.
It was first shown by W.W. Garner and H.A. Allard in 1920.
They worked with a mutant variety of tobacco called Maryland Mammoth, which kept growing vegetatively in summer and flowered only in winter in the greenhouse.
They found that it flowered only when the day length was shorter than a critical value; it is a short day plant.
They made similar observations in the Biloxi variety of soybean.
So the importance of day length in flowering was first shown in tobacco.
It was first shown by W.W. Garner and H.A. Allard in 1920.
They worked with a mutant variety of tobacco called Maryland Mammoth, which kept growing vegetatively in summer and flowered only in winter in the greenhouse.
They found that it flowered only when the day length was shorter than a critical value; it is a short day plant.
They made similar observations in the Biloxi variety of soybean.
So the importance of day length in flowering was first shown in tobacco.