Biographical Memoirs Volume 48 (1976) / Chapter Skim
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Harry Alfred Borthwick
Harry Alfred Borthwick
Pages 104-123
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From page 105... ...
Harry continued working toward a doctorate at Stanford, devoting his attention mainly to the reproduction and development of both higher and lower plants. The position at Davis also required attention to basic and applied aspects of vegetable crop plants.
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From page 106... ...
Because the photoperiodic response in plants partly regulates flowering, it was thought that progress might best result from attention to the morphological aspects involved in plants changing from vegetative to reproductive growth and to the underlying physiology. Emsweller recommended Harry Borthwick to undertake the work.
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From page 107... ...
The findings by others that the leaf was the receptor organ for the effective light and that transport of the stimulus to the terminal of the plant required phloem continuity were soon verified. A major discovery at this juncture was the effectiveness of short irradiations near the middle of Tong nights in preventing flowering response.
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From page 108... ...
Eben and Vivian Toole, who worked with seeds in a laboratory adjacent to the room where the action spectra were measured, proposed examining the promotion of lettuce seed germination. The floweringaction spectrum again was found.
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From page 109... ...
M Cathey, who had succeeded Emsweller in floricultural work at Beltsville, Harry studied the control of flowering of poinsettia and chrysanthemum, which came into wide use in flower production.
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From page 110... ...
He had been studying the diurnal movement of mimosa leaflets as an example of photoperiodism or biological rhythm, a favorite topic of P Bert in Bordeaux more than a century earlier and of Charles Darwin and his son, Francis, in their Power of Movement in Plants.
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From page 111... ...
He was elected to the National Academy of Sciences in 1961. He was President of the American Society of Plant Physiologists for a term and the recipient of its highest honor, the biennial Stephen Hales Award, and of a life membership.
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From page 112... ...
Plant Physiol. = Annual Review of Plant Physiology Bot.
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From page 113... ...
Effect of variation in temperature during the photoperiod induction upon initiation of flower primordia in Biloxi soybeans.
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From page 114... ...
Action spectrum for the photoperiodic control of floral initiation in Biloxi soybeans. Science, 102:152-55.
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From page 115... ...
Action spectrum for photoperiodic control of floral initiation of a long-day plant, Wintex barley (Hordeum vulgare)
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From page 116... ...
Photoperiodism—the dark secret; how nights and light affect plant growth. Electricity on the Farm Magazine, 26:11-13.
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From page 117... ...
A reversible photoreaction controlling photoperiodic response, seed germination, and other phenomena. In: Congres international de bota
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From page 118... ...
Photoperiodic responses of hydrangeas. In: Report of the 14th International Horticultural Congress, vol.
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From page 119... ...
Photocontrol of plant development by the simultaneous excitations of two interconvertible pigments.
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From page 120... ...
Failure of reversibility of the photoreaction controlling plant growth. In: Progress in Photobiology.
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From page 121... ...
Rhythmic flowering responses and phytochrome changes in a selection o£ Chenopodium rubrum. Canadian Journal of Botany, 43: 825-53.
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From page 122... ...
The photoreaction controlling seed germination in Eragrostis curoula. Plant and Cell Physiology, 9:125-36.
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