new group of plant hormones discovered...
ScienceDaily (Aug. 13, 2008 — Scientists from the Wageningen University Laboratory of Plant Physiology and an international team of scientists have discovered a new group of plant hormones, the so-called strigolactones. This group of chemicals is known to be involved in the interaction between plants and their environment.
The scientists have now proven that strigolactones, as hormones, are also crucial for the branching of plants. The discovery will soon be published in Nature and is of great importance for innovations in agriculture. Examples include the development of cut flowers or tomato plants with more or fewer branches. These crops are of major economic and social importance worldwide.
The growth and development of plants is largely controlled by plant hormones. Plants produce these chemicals themselves, thus controlling the growth and development of roots and stems, for example. A number of plant hormones, such as auxins, giberellins and cytokinins, were discovered by scientists decades ago. Now a new group of hormones has been found: The so-called strigolactones.
Previous research by institutes including Wageningen UR has shown that strigolactones plays a major part in the interaction between plants and their environment. As plants cannot move, they commonly use their own chemicals to control the environment as best as they can.
Strigolactones are of major importance to the interaction between plants and symbiotic fungi, for example. These fungi live in a symbiotic relationship with plants, lthat is mutually beneficial. They transport minerals from the soil to the plant, while the plant gives the fungi sugars ‘in return’.
Unfortunately, the strigolactones have also been “hijacked” by harmful organisms: They help seeds of parasitic plants to germinate when plant roots are in the vicinity. The seedlings of the parasite attach to the root of the plant and use the plant’s nutrients for their own growth and reproduction. Unlike the symbiotic fungi, however, they do not give anything in return. On the contrary, the parasitism often causes the host plant to die, eventually.
The international research team consisting of French, Australian and Dutch scientists, coordinated in France, found mutants of pea that were branching without restraint. It turned out that these pea plants were not capable of producing strigolactones. When the plants were administered strigolactones, the unrestrained branching stopped. The same effect occurred in an entirely different plant, thale cress. The mutant plants also caused a significant lower germination of the parasitic plant seeds and induced less interaction with symbiotic fungi.
The scientists also showed that a specific ‘receptor reaction’ for the strigolactones occurs in plants, a phenomenon that is characteristic for plant hormones. Although some previously discovered plants with unrestrained branching turned out to be producing strigolactones themselves, their receptor connection was disturbed: Strigolactones administered from the outside could not stop the uncontrolled branching.
It has also been shown that the plants are capable of transporting strigolactones internally and that the chemicals work at very low concentrations, two other typical characteristics of plant hormones.
It is expected that this new knowledge will be applied in agriculture and horticulture, for example in breeding and the development of branching regulators.
Cut flower varieties and potted plants with either more or less branching may have special ornamental value, while crops with more or less branching may be beneficial in cultivation. Tomato plants in which less branching occurs can benefit the greenhouse horticulture, for instance.
Oligosaccharide...
Learn about Oligosaccharide here: http://www.gak.co.jp/FCCA/glycoword/.../SA-A00_E.html
Rhizotonic is the only nute i have found that confirms using Oligosaccharide but im sure you could find it elsewhere if you have the knowledge of how to use it correctly.
I asked H&G if it was in roots exelerator and they said "Im not sure, we would have to ask the guys in the lab and that isnt possible" lol...
im not knocking or promoting either product... both are overpriced and both work really well.
Here is a another article from Dec. 2009 Maximum Yield about Azos/Azospirillum : http://www.maximumyield.com/article_...ueVar=December
sounds somewhat promising!
Originally Posted by jberry
Pseudomonas for Hydroponic Tomatoes...
Beneficial Bacterias for Hydroponic Tomatoes:
Abstract:
Twenty-eight microorganisms showing in vitro antagonistic activity against Pythium ultimum were tested for their ability to reduce root rot [P. ultimum] on mature tomato plants grown in a greenhouse under hydroponic conditions.
Of those, Penicillium brevicompactum, Penicillium solitum strain 1, Pseudomonas fluorescens subgroup G strain 2, Pseudomonas marginalis, Pseudomonas putida subgroup B strain 1, Pseudomonas syringae strain 1, and Trichoderma atroviride were shown to strongly reduce root rot severity, to improve the anchorage, and to increase the marketable yields of the plants grown in Rockwool infested with P. ultimum.
Experiments conducted in an organic medium containing peat, pine sawdust, and compost (v/v/v; 60:30:10) also revealed the capability of most of these microorganisms to reduce root rot severity and to improve the anchorage of the tomato plants.
However, Pseudomonas marginalis was the only microorganism that significantly improved fruit production of infected plants grown in organic medium...
Moreover, Penicillium brevicompactum, Penicillium solitum strain 1, Pseudomonas fluorescens subgroup G strain 2, Pseudomonas marginalis, Pseudomonas putida subgroup B strain 1, and T. atroviride were shown to stimulate the growth of healthy tomato seedlings, suggesting that they act as PGPR (plant-growth-promoting rhizobacteria) or PGPF (plant-growth-promoting fungi).
This study led to the selection of potential biocontrol agents against root rot of tomato caused by P. ultimum in hydroponic systems. This may open the way for new alternatives for the biological control of Pythium diseases in hydroponic systems that not only protect the crop but also have a beneficial effect on the plant growth and development in the absence of pathogens.
Publisher: Canadian Phytopathological Society
Title: Control of greenhouse tomato root rot (Pythium ultimum) in hydroponic systems, using plant-growth-promoting microorganisms.
Personal Authors: Gravel, V., Martinez, C., Antoun, H., Tweddell, R. J.
Author Affiliation: Centre de recherche en horticulture, Université Laval, Québec, QC G1K 7P4, Canada.
Document Title: Canadian Journal of Plant Pathology
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I found some interesting things on UvB since the subject was brought up. I've been doing alot of research on this field and I have found these to links to be of value.
http://www.greenmanspage.com/guides/thc.html
http://www.cannabase.com/cl/bcga/bcga/uv.htm
I'm still doing research on this field so if I come up with more I'll post it.
such an incredible resource, great job everyone, super happy I found it but damn it if my eyes arent sore as hell know..
thread needs to be revived, to much useful information to be left gathering dust.
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