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THE FUNC1'ION OF SIGNAL-TRANSDUCING PHOTORECEPTORS IN RELATION TO PLANT STRATEGY 483 THE NATURAL LIGHT ENVIRONMENT 485 Technical Considerations 485 Solar Radiation 486 Daylight 488 Twilight 488 Moonlight and Starlight 489 Light Quality Under Vegetation Canopies 490 Light Quality Underwater 490 Ef ect of Aspect on Light Quality 492 Light Quality under the Soil 492 Light Quality as an Environmental Signal 492 PLANT RESPONSES TO NATURAL LIGHT QUALITY CHANGES 494 Experimental Design 494 Plant Strategy in Relation to the Changing Light Environment 495 Light Quality and Responses to Shade: Established Plants 495 Light Quality and Responses to Shade: Regenerative Strategy 498 Light Quality and Photoperiodism 500 Specific Responses to Blue Light in Nature 501 Light Quality and Plant Responses .Underwater 502 Summary 503
H. SMITH (Tue,) studied this question.