Study: Sugar demand, not auxin, is the initial regulator of apical dominance

cannaculturalist

cannaculturalist

Well-Known Member
I just came across this new research paper that was just published. Might be of interest you yall. Here is the abstract.



Sugar demand, not auxin, is the initial regulator of apical dominance

Michael G. Masona, John J. Rossb, Benjamin A. Babstc, Brittany N. Wienclawc, and Christine A. Beveridgea,

School of Biological Sciences, The University of Queensland, St. Lucia, QLD 4072, Australia; School of Plant Science, University of Tasmania, Sandy Bay, TAS 7005, Australia; and Biosciences Department, Brookhaven National Laboratory, Upton, NY 11973-5000

Edited by Deborah P. Delmer, University of California, Davis, CA, and approved March 14, 2014 (received for review November 25, 2013)

For almost a century the plant hormone auxin has been central to theories on apical dominance, whereby the growing shoot tip suppresses the growth of the axillary buds below. According to the classic model, the auxin indole-3-acetic acid is produced in the shoot tip and transported down the stem, where it inhibits bud growth. We report here that the initiation of bud growth after shoot tip loss cannot be dependent on apical auxin supply because we observe bud release up to 24 h before changes in auxin content in the adjacent stem. After the loss of the shoot tip, sugars are rapidly redistributed over large distances and accumulate in axillary buds within a timeframe that correlates with bud release. Moreover, artificially increasing sucrose levels in plants represses the expression of BRANCHED1 (BRC1), the key transcriptional reg- ulator responsible for maintaining bud dormancy, and results in rapid bud release. An enhancement in sugar supply is both neces- sary and sufficient for suppressed buds to be released from apical dominance. Our data support a theory of apical dominance whereby the shoot tip’s strong demand for sugars inhibits axillary bud outgrowth by limiting the amount of sugar translocated to those buds.
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RL420

RL420

Well-Known Member
Good info, thanks for posting. Can you give me a link to the source? Can't seem to find it on my own for some reason :wall:
 
L

lax123

Well-Known Member
Hi,
I cant download the pdf, i get redirected to the main page of that filedropper site.
Does it work for others?
 
Uncle Ben

Uncle Ben

Well-Known Member
Alright soldiers, let's break out those bags of sugar!

Interesting read but I'm not sure what the point is.

Like Hillary says.....

 
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UncleReemis

UncleReemis

Well-Known Member
"An enhancement in sugar supply is both neces- sary and sufficient for suppressed buds to be released from apical dominance."

So this study is saying that artificially increasing sucrose levels helps to quell the popcorn effect.
 
Uncle Ben

Uncle Ben

Well-Known Member
UncleReemis said:
"An enhancement in sugar supply is both neces- sary and sufficient for suppressed buds to be released from apical dominance."

So this study is saying that artificially increasing sucrose levels helps to quell the popcorn effect.
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No, that's not what it's saying.
 
UncleReemis

UncleReemis

Well-Known Member
"Moreover, artificially increasing sucrose levels in plants represses the expression of BRANCHED1 (BRC1), the key transcriptional reg- ulator responsible for maintaining bud dormancy, and results in rapid bud release."

What is this saying UBen?
 
Uncle Ben

Uncle Ben

Well-Known Member
UncleReemis said:
"Moreover, artificially increasing sucrose levels in plants represses the expression of BRANCHED1 (BRC1), the key transcriptional reg- ulator responsible for maintaining bud dormancy, and results in rapid bud release."

What is this saying UB?
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I'll bite. If there's any merit to these "new" findings, it may change gardening as we know it, then again, it may not. Now, if sucrose was such a great product, it would be sold as fertilizer....or something like that.

I apply all kinds of chemicals. Sucrose would be one of them if warranted. Will be interesting to see if anything comes out of this for the commercial industry, and I'm not talking pot.

I have never known "an enhancement in sugar" to benefit anything except my cup of coffee.

"We found that upon decapitation of the plant, there is a rapid increase in sugar delivery to the buds, which promotes bud outgrowth,” Babst said. The sugars move about 100 times faster than auxin, a plant hormone previously believed to regulate bud growth. This finding supports the idea that sugar—not auxin—is the key signaling molecule for this immediate response to clipping.

Auxin plays a secondary role later in the process,” Babst said"

Immediate response, secondary response. OK, so what.

Hormones including auxins are still at play here. Who cares if the signaling molecule is a sugar molecule or something else?

Again, interesting read but it doesn't do too much for me.

UB
 
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UncleBuck

UncleBuck

Well-Known Member
Uncle Ben said:
I'll bite. If there's any merit to these "new" findings, it will change gardening as we know it. Now, if sucrose was such a great product, it would be sold as fertilizer....or something like that.

I apply all kinds of chemicals. Sucrose would be one of them if warranted. Will be interesting to see if anything comes out of this for the commercial industry, and I'm not talking pot.
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good job on interpreting the findings of the study as requested and totally not dodging the question.
 
UncleReemis

UncleReemis

Well-Known Member
UncleReemis said:
"An enhancement in sugar supply is both neces- sary and sufficient for suppressed buds to be released from apical dominance."

So this study is saying that artificially increasing sucrose levels helps to quell the popcorn effect.
Click to expand...
Uncle Ben said:
No, that's not what it's saying.
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Uncle Ben said:
I'll bite. If there's any merit to these "new" findings, it will change gardening as we know it. Now, if sucrose was such a great product, it would be sold as fertilizer....or something like that.

I apply all kinds of chemicals. Sucrose would be one of them if warranted. Will be interesting to see if anything comes out of this for the commercial industry, and I'm not talking pot.
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You don't even know what you're biting on.
 
Uncle Ben

Uncle Ben

Well-Known Member
Fellas, this is not supposed to be about me. I appreciate all the attention. Suggests I have a lot of power over some of you guys.

Stay sugar sweet........ and Buck, you give your thuggery buddy thar a slap on the ass for me before you two give it up for the night, ya hear? ;)
 
cannaculturalist

cannaculturalist

Well-Known Member
Uncle Ben said:
I'll bite. If there's any merit to these "new" findings, it may change gardening as we know it, then again, it may not. Now, if sucrose was such a great product, it would be sold as fertilizer....or something like that.

I apply all kinds of chemicals. Sucrose would be one of them if warranted. Will be interesting to see if anything comes out of this for the commercial industry, and I'm not talking pot.

I have never known "an enhancement in sugar" to benefit anything except my cup of coffee.

Immediate response, secondary response. OK, so what.

Hormones including auxins are still at play here. Who cares if the signaling molecule is a sugar molecule or something else?

Again, interesting read but it doesn't do too much for me.

UB
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I think you're looking at this from the wrong perspective. This study shows a difference in our understanding of a metabolic process - a difference which could help or not make any difference to horticultural practices. The notion that in order for this to be valid science, it must already be well established with a retail product to back it up, is daft. Plenty of products out there claiming things with little or no scientific evidence.

This is still early research, the first time this seems to have been seen, and yet to be shown in other species (an important point in all this). To derride this entirely as just not being useful to you or fitting into your existing practices is to look against better understanding
 
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