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Use of a fertilizer containing l-amino acid for improving root growth and growth of mycorrhiza

a technology of lamino acid and root growth, which is applied in the direction of application, biocide, nitrogenous fertilisers, etc., can solve the problems of incompatible plant cultivation efficiency, high and unbalanced shoot mass fraction, imbalanced allocation, etc., and achieve the effect of stimulating root growth and stimulating the growth of the whole plan

Inactive Publication Date: 2011-10-20
SWETREE TECHOLOGIES AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015]It has now surprisingly been shown that it is possible to provide a fertilizer capable of inducing and stimulating root growth as well as development of mycorrhiza at the same time as it stimulates growth of the whole plant.
[0025]Furthermore, it is disclosed that the higher fraction of the nitrogen source that is a L-amino acid, the higher the root fraction is of the biomass, i.e. more L-amino acid in the used fertilizer will give more roots, more fine roots and many more root tips that can help the plants when planted outdoors.

Problems solved by technology

As described above, high amounts of nutrients generally stimulate growth of above ground parts more than of belowground parts and thus commercially cultivated plants, because of ample supply of nutrients; have often a high and unbalanced shoot mass fraction.
From what is described above it can be concluded that efficient cultivation of plants is incompatible with an optimal plant allocation pattern.
The need for high growth rates during cultivation can only be achieved through application of high amounts of N which in turn stimulates shoot growth more than root growth and thus leads to an imbalanced allocation.
With current cultivation methods, this cannot be achieved.
Furthermore, nothing is taught about the simultaneously development of mycorrhiza at the same time as it stimulates growth of the whole plant in these two patents.

Method used

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  • Use of a fertilizer containing l-amino acid for improving root growth and growth of mycorrhiza
  • Use of a fertilizer containing l-amino acid for improving root growth and growth of mycorrhiza
  • Use of a fertilizer containing l-amino acid for improving root growth and growth of mycorrhiza

Examples

Experimental program
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Effect test

example 1

Allocation of Arginine-Nitrogen in Arabidopsis

[0055]The experiment was performed with wild type Arabidopsis on sterile agar plates containing half strength Murashige and Skoog (MS) medium (Murashige and Skoog, 1962), with 0.65% w / v agar (plant agar, Duchefa Biochemie), 0.5% w / v sucrose amended with 3 mM nitrate and 30 μM U-15N (>98% 15N) L-Arg and buffered to pH 5.8 with 3.6 mM MES (2N-morpholinoethanesulfonic acid). Plants were grown for 19 days when 20 plants were harvested and divided into 4 replicates (i.e. each replicated consisted of 5 plants). Shoots and roots were separated; roots were rinsed and cleaned thoroughly three times in a solution of 0.5 mM CaCl2 to remove adhered compounds from surfaces. Shoots and roots were dried at 60° C. overnight, weighed and homogenized. Finally, samples were analyzed using a Europe Scientific Isotope Ratio Mass Spectrometer to determine total N and 15N contents. The results are disclosed in FIG. 3.

example 2

Allocation of Biomass and Glutamine-N in Arabidopsis and Poplar

[0056]Allocation experiments were performed with wild type Arabidopsis on sterile agar plates and in the case of poplar, in plastic boxes, containing the equivalent of nitrogen-free, half strength Murashige and Skoog (MS) medium (Murashige and Skoog, 1962), with 0.8% w / v agar (plant agar, Duchefa Biochemie), 0.5% w / v sucrose and pH was set to 5.8 using MES buffer. Nitrogen was added to the agar either as an equimolar mixture of NH4+ and NO3− or as an equimolar mixture, corresponding to 50% of each of L-Gln and NO3−, both mixtures at a total rate corresponding to 3 mM N. Four labelling treatments were carried out, i.e. two for each N mixture. Thus half of the plates with the NH4NO3 mixture contained labelled NH4+, the other half contained labelled NO3−. Similarly, half of the plates with L-Gln:NO3− mixtures contained labelled L-Gln, the other half contained labelled NO3−. For each labelling treatment, 1% of the N source w...

example 3

Evaluation of Mycorrhiza of Scots Pine Roots

[0057]Plants were cultivated outdoors during one growth season in northern Sweden. Plants were supplied with a complex nutrient solution with either ammonium nitrate or arginine as nitrogen sources. Arginine-cultivated seedlings were fertilized once a week during the growth season (in total 50 mg N per seedling) while reference plants were fertilized 2-3 times a week (in total 71,5 mg N per seedling). Arginine-loaded seedlings received the same treatment as the reference with the exception that they also received a pulse of arginine after the last fertilization event in early autumn. The amount of arginine supplied in this pulse corresponded to 5 mg nitrogen per seedling. The average chitin content of the roots can be found in FIG. 6 and in Table 2. The values are shown as average value±standard evaluation, n=6.

TABLE 2Chitin content of Scots pine rootsChitin content (mg chitin / g root)FertilizerAverage values ± SE, n = 6Reference1.35 ± 0.39...

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Abstract

The present invention provides a method of using a fertilizer, comprising an amino acid selected from the group of L-glutamine, L-asparagine and L-arginine as major nitrogen source, optionally together with inorganic nitrogen and / or a suitable preservative, for stimulating root growth, inducing more fine roots, increase the number of root tips and / or for stimulating mycorrhiza development.

Description

[0001]The present invention relates to the use of a fertilizer affecting plant biomass allocation. More specifically, the fertilizer is able to stimulate root growth, fine root development, increase the number of root tips and mycorrhiza development. Thus, the invention provides methods for using the fertilizer in order to stimulate root growth, fine root development, increase the number of root tips and mycorrhiza development. Furthermore, the invention provides a method for using the fertilizer for modulation of the root fraction of the biomass.TECHNICAL BACKGROUND[0002]Allocation of growth between shoots and roots is a major process by which plant acclimates to various environmental conditions. It is well-known that nitrogen supply is a major determinant of this process. At high nitrogen supply, growth of above ground parts is stimulated relative to that of structures below ground, while at low nitrogen supply, root growth is enhanced (FIG. 1). This strong dependence of allocatio...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C05C11/00C05G3/90
CPCA01N37/44A01N47/44C05C11/00C05F11/10C05C1/00C05C5/00C05F11/00Y02P60/21
Inventor NASHOLM, TORGNYSVENNERSTAM, HENRIK
Owner SWETREE TECHOLOGIES AB
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