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Explanations of How Plants Respond to Light

By greene
May 27, 2015

I couldn't figure out why one of my plants looked parched/dry/thirsty even though I had watered the day before. Research tells me this plant is exhibiting a "nyctinastic" response to approaching night. The plant knew when it was day and when it was night, folded its leaves, and appeared to be napping. Wow, a nyctinastic response is fantastic. Do plants sleep? Yes, and they do a whole lot more. There are several types of nastic responses in the plant world.

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Name: Mary
The dry side of Oregon
Be yourself, you can be no one else
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MaryE
May 27, 2015 7:02 AM CST
I'm looking forward to the rest of the story.
Of all the things I've lost, I miss my mind the most.
More ramblings at http://thegatheringplacehome.myfastforum.org/forum54.php
Name: Melissa E. Keyes
St. Croix, U.S. Virgin Islands
Zone 11+
Charter ATP Member
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coconut
May 27, 2015 10:00 AM CST
Sunflower heavy with seeds is epinasty?
Name: Jean
Hot Springs Vlg, AR, DeLand, F
Region: Florida Daylilies Garden Ideas: Master Level Celebrating Gardening: 2015
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rocklady
May 27, 2015 10:13 AM CST
Greene, thanks for expanding my plant knowledge this morning. A very interesting article.
Any day you wake up on the sunny side of the grass is a good day.

"The moving hand writes and having writ moves on. Neither all thy piety nor all thy wit can lure it back to cancel half a line nor all thy tears wash out a word of it." The Rubiyat by Omar Khayyam
Surprisingly GREEN Pittsburgh (Zone 6a)
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crittergarden
May 27, 2015 10:21 AM CST
VERY cool!
Possibly the best article I've read here!
(Forgive my memory if there's been another I read...)
But this one is definitely VERY cool!
SHOW ME YOUR CRITTERS! I have a critter page over at Cubits. http://cubits.org/crittergarden/thread/view/73275/
[Last edited by crittergarden - May 27, 2015 10:22 AM (+)]
Give a thumbs up | Quote | Post #863650 (4)
Name: Greene
Savannah, GA (Sunset 28) (Zone 8b)
Rabbit Keeper Critters Allowed Celebrating Gardening: 2015 Plant Identifier Garden Ideas: Master Level Garden Sages
Herbs Region: Georgia Region: United States of America Native Plants and Wildflowers Dog Lover Composter
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greene
May 27, 2015 10:45 AM CST
@coconut, You are correct that the image I selected does not exactly show epinasty in action; but what would? I was weary and did the best I could, trying to take images that were available in the ATP database.

After weeks of reading and researching each of the plant movements, I was ready to cave in. I found a good explanation for epinasty in a book by Gerard Meuant, "Flooding and Plant Growth" and since gravity can have some effect on epinasty, I figured the heavy seed head image was close enough and better than no image at all. (Plus Trish wanted us to hurry and finish our articles in progress and she was doing a bit of 'housecleaning'. Rolling on the floor laughing )

Please, if you or anyone can supply a series to photo images to show epinasty it would be appreciated. Thumbs up
Sunset Zone 28, AHS Heat Zone 9, USDA zone 8b~~"Leaf of Faith"
Name: Melissa E. Keyes
St. Croix, U.S. Virgin Islands
Zone 11+
Charter ATP Member
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coconut
May 27, 2015 11:59 AM CST
OK, Greene. I'll see if I can induce this in some plants, and post here for you.

And thank you for some great new Scrabble words!
Name: Greene
Savannah, GA (Sunset 28) (Zone 8b)
Rabbit Keeper Critters Allowed Celebrating Gardening: 2015 Plant Identifier Garden Ideas: Master Level Garden Sages
Herbs Region: Georgia Region: United States of America Native Plants and Wildflowers Dog Lover Composter
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greene
May 27, 2015 12:06 PM CST
Thank You! Thank You! Look forward to seeing this word in action.

Scrabble! Wow, you are so right. You will be a winner for sure with these crazy words.
Sunset Zone 28, AHS Heat Zone 9, USDA zone 8b~~"Leaf of Faith"
Name: Melissa E. Keyes
St. Croix, U.S. Virgin Islands
Zone 11+
Charter ATP Member
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coconut
May 27, 2015 12:16 PM CST
A google image search for epinasty shows some very interesting things. Pine tree spring growth showing (epinasty) twisting and curling new growth caused by an auxin herbicide. Tomato plants showing twisted, curling from pollution or herbicide use. Ethylene gas makes this happen, also. And, I believe, some viruses.

Hum. Yes, I'll have some photos by Friday afternoon, I know of a few papaya plants that are virused, and the leaves exhibit this growth 'malfunction'.
Name: Greene
Savannah, GA (Sunset 28) (Zone 8b)
Rabbit Keeper Critters Allowed Celebrating Gardening: 2015 Plant Identifier Garden Ideas: Master Level Garden Sages
Herbs Region: Georgia Region: United States of America Native Plants and Wildflowers Dog Lover Composter
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greene
May 27, 2015 2:33 PM CST
Flooding also causes epinasty. Dont' forget to check for that. Thumbs up
Sunset Zone 28, AHS Heat Zone 9, USDA zone 8b~~"Leaf of Faith"
Name: Janice Hurd
Thompsonville Village, Ct. (Zone 6a)
"Where flowers bloom so does hope"
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phoebesviolets
May 28, 2015 9:40 AM CST
Thumbs up Thumbs up Awesome article! Learned a lot.
“Too often we underestimate the power of a touch, a smile, a kind word, a listening ear, an honest compliment, or the smallest act of caring, all of which have the potential to turn a life around.” – Leo F. Buscaglia
Name: Melissa E. Keyes
St. Croix, U.S. Virgin Islands
Zone 11+
Charter ATP Member
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coconut
May 28, 2015 10:32 AM CST
Hum, since I am allergic to tomatoes, it wouldn't bother me to kill one, MAYBE I'll buy a little plant and flood the poor thing. OK, we shall see!
Name: Greene
Savannah, GA (Sunset 28) (Zone 8b)
Rabbit Keeper Critters Allowed Celebrating Gardening: 2015 Plant Identifier Garden Ideas: Master Level Garden Sages
Herbs Region: Georgia Region: United States of America Native Plants and Wildflowers Dog Lover Composter
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greene
May 28, 2015 12:04 PM CST
Thumbs up
Sunset Zone 28, AHS Heat Zone 9, USDA zone 8b~~"Leaf of Faith"

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