Photoperiod and Temperature

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Karl K
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Photoperiod and Temperature

Post: # 70841Post Karl K
Tue Jan 07, 2020 11:34 pm

Just recently I was going over some of the papers on my web page came across this item:
Garner & Allard (1920)
A large dump of Iris florentina L., with all earth intact, was transplanted October 20, 1919, to each of the two greenhouses. The plants exposed to the long daily period of illumination began growing vigorously at once, soon attaining the normal size for this species, and produced blossoms on December 24 and December 30. The controls remained practically dormant and showed no tendency to blossom as late as February 12, 1920.
http://bulbnrose.x10.mx/Heredity/Garner ... 1920b.html

And then by coincidence I found similar observation by Lammerts in regards to peaches.
DISCUSSION.—The marked increase in rate of growth of woody plants when grown under long photoperiod and high minimum temperature has been reported by several investigators, particularly Kramer (1936). However, this response to long photoperiod does not seem to have been taken advantage of by fruit breeders as a means of shortening the breeding cycle of trees. The peach is remarkably responsive to increased photoperiod and higher minimum temperatures, though cherries and apricots, as well as cherimoyas and avocados, have also shown marked response.
http://bulbnrose.x10.mx/Heredity/Lammer ... h1943.html

This may be of particular importance when removing embryos from the achenes in the Autumn and Winter to get a jump on the season.

matt lustig
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Re: Photoperiod and Temperature

Post: # 70846Post matt lustig
Wed Jan 08, 2020 8:07 pm

That's an interesting concept Karl. See https://www.researchgate.net/publicatio ... h_chambers for an interesting similar example in chestnuts. In my experience chestnuts in the field may produce staminate flowers in about 8 years (pistillate even later), while researchers using a high-light chamber achieved some staminate flowering in approximately 6 months. Of course high light was not the only variable, but it's still interesting and the concept certainly has potential application in other species.

The article includes some interesting details about the color spectrum of the light sources used.

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