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Min An - One of the best experts on this subject based on the ideXlab platform.

  • allelochemicals in wheat triticum aestivum l variation of phenolic Acids in root tissues
    Journal of Agricultural and Food Chemistry, 2000
    Co-Authors: Hanwen Wu, Jim Pratley, Deirdre Lemerle, T Haig, Min An
    Abstract:

    : Analysis by GC/MS/MS showed that a worldwide collection of 58 wheat accessions differed significantly in the production of seven phenolic Acids in the roots of 17-day-old wheat seedlings. The allelochemical contents among wheat accessions ranged from 24.5 to 94.5, 19.9 to 91.7, 3.7 to 15.4, 2.2 to 38.6, 1.0 to 42.2, 19.3 to 183.6, and 11.7 to 187.6 mg/kg of root dry weight for p-hydroxybenzoic, vanillic, cis-p-coumaric, syringic, cis-Ferulic, trans-p-coumaric, and trans-Ferulic Acids, respectively. trans-Ferulic acid was identified as the most predominant phenolic acid in the roots. Phenolic Acids, with the exception of syringic acid, were more concentrated in roots than in shoots. Significant correlation was found between the roots and the shoots in the contents of vanillic, cis-p-coumaric, syringic, trans-p-coumaric, and trans-Ferulic Acids, and in the content of each structural group of phenolic Acids. Wheat accessions with high levels of total identified phenolic Acids in the roots were generally strongly allelopathic to the growth of annual ryegrass.

  • distribution and exudation of allelochemicals in wheat triticum aestivum
    Journal of Chemical Ecology, 2000
    Co-Authors: Hanwen Wu, Jim Pratley, Deirdre Lemerle, T Haig, Min An
    Abstract:

    Wheat allelopathy has potential for weed suppression. Allelochemicals were identified in wheat seedlings, and they were exuded from seedlings into agar growth medium. p-Hydroxybenzoic, trans-p-coumaric, cis-p-coumaric, syringic, vanillic, trans-Ferulic, and cis-Ferulic Acids and 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA) were identified in both the shoots and roots of 17-day-old wheat seedlings and their associated agar growth medium. Wheat accessions with previously identified allelopathic activity tended to contain higher levels of allelochemicals than poorly allelopathic ones. The allelopathic compounds present in the shoots generally also were identified in the roots and in the agar medium. Allelochemicals were distributed differentially in wheat, with roots normally containing higher levels of allelochemicals than the shoots. When the eight allelochemicals were grouped into benzoic acid and cinnamic acid derivatives, DIMBOA, total coumaric, and total Ferulic Acids, the amount of each group of allelochemicals was correlated between the roots and the shoots. Most of the allelochemicals identified in the shoots and roots could be exuded by the living roots of wheat seedling into the agar growth medium. However, the amounts of allelochemicals in the agar growth medium were not proportional to those in the roots. Results suggest that wheat plants may retain allelochemicals once synthesized. The presence of allelochemicals in the agar growth medium demonstrated that wheat seedlings were able to synthesize and to exude phytotoxic compounds through their root system that could inhibit the root growth of annual ryegrass.

Deirdre Lemerle - One of the best experts on this subject based on the ideXlab platform.

  • biochemical basis for wheat seedling allelopathy on the suppression of annual ryegrass lolium rigidum
    Journal of Agricultural and Food Chemistry, 2002
    Co-Authors: Terrence Haig, Jim Pratley, Deirdre Lemerle
    Abstract:

    The chemical basis for wheat seedling allelopathy on the growth of annual ryegrass was investigated by the identification and quantification of multiple allelochemicals from wheat seedlings. Results indicated that 58 wheat accessions differed significantly in seedling allelopathy and inhibited the root growth of ryegrass from 10 to 91%, depending on accession. Analysis of allelochemicals by GC/MS/MS indicated that allelopathy was significantly correlated with the levels of measured allelochemicals in the shoots and roots of young wheat seedlings. Ryegrass root growth was also negatively correlated with the levels of p-hydroxybenzoic, vanillic, and trans-Ferulic Acids in root exudates. Wheat allelopathic potential was negatively correlated with the levels of the eight known allelochemicals quantified in the shoots, roots, and water−agar medium, with multiple regression coefficients (r) of −0.61, −0.71, and −0.71, respectively. In comparison with weakly allelopathic accessions, strongly allelopathic accessi...

  • allelochemicals in wheat triticum aestivum l variation of phenolic Acids in root tissues
    Journal of Agricultural and Food Chemistry, 2000
    Co-Authors: Hanwen Wu, Jim Pratley, Deirdre Lemerle, T Haig, Min An
    Abstract:

    : Analysis by GC/MS/MS showed that a worldwide collection of 58 wheat accessions differed significantly in the production of seven phenolic Acids in the roots of 17-day-old wheat seedlings. The allelochemical contents among wheat accessions ranged from 24.5 to 94.5, 19.9 to 91.7, 3.7 to 15.4, 2.2 to 38.6, 1.0 to 42.2, 19.3 to 183.6, and 11.7 to 187.6 mg/kg of root dry weight for p-hydroxybenzoic, vanillic, cis-p-coumaric, syringic, cis-Ferulic, trans-p-coumaric, and trans-Ferulic Acids, respectively. trans-Ferulic acid was identified as the most predominant phenolic acid in the roots. Phenolic Acids, with the exception of syringic acid, were more concentrated in roots than in shoots. Significant correlation was found between the roots and the shoots in the contents of vanillic, cis-p-coumaric, syringic, trans-p-coumaric, and trans-Ferulic Acids, and in the content of each structural group of phenolic Acids. Wheat accessions with high levels of total identified phenolic Acids in the roots were generally strongly allelopathic to the growth of annual ryegrass.

  • distribution and exudation of allelochemicals in wheat triticum aestivum
    Journal of Chemical Ecology, 2000
    Co-Authors: Hanwen Wu, Jim Pratley, Deirdre Lemerle, T Haig, Min An
    Abstract:

    Wheat allelopathy has potential for weed suppression. Allelochemicals were identified in wheat seedlings, and they were exuded from seedlings into agar growth medium. p-Hydroxybenzoic, trans-p-coumaric, cis-p-coumaric, syringic, vanillic, trans-Ferulic, and cis-Ferulic Acids and 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA) were identified in both the shoots and roots of 17-day-old wheat seedlings and their associated agar growth medium. Wheat accessions with previously identified allelopathic activity tended to contain higher levels of allelochemicals than poorly allelopathic ones. The allelopathic compounds present in the shoots generally also were identified in the roots and in the agar medium. Allelochemicals were distributed differentially in wheat, with roots normally containing higher levels of allelochemicals than the shoots. When the eight allelochemicals were grouped into benzoic acid and cinnamic acid derivatives, DIMBOA, total coumaric, and total Ferulic Acids, the amount of each group of allelochemicals was correlated between the roots and the shoots. Most of the allelochemicals identified in the shoots and roots could be exuded by the living roots of wheat seedling into the agar growth medium. However, the amounts of allelochemicals in the agar growth medium were not proportional to those in the roots. Results suggest that wheat plants may retain allelochemicals once synthesized. The presence of allelochemicals in the agar growth medium demonstrated that wheat seedlings were able to synthesize and to exude phytotoxic compounds through their root system that could inhibit the root growth of annual ryegrass.

Paul-emile Pilet - One of the best experts on this subject based on the ideXlab platform.

  • cell wall bound trans and cis Ferulic Acids in growing maize roots
    Physiologia Plantarum, 1994
    Co-Authors: Roland Locher, Hilary V. Martin, René Grison, Paul-emile Pilet
    Abstract:

    The levels of cell wall-bound trans- and cis-Ferulic Acids in roots of dark grown Zea mays cv. LG11 plants were measured. They were quantified after alkaline hydrolysis of purified cell walls by reversed phase HPLC using trans-cinnamic acid as internal standard. The total amount of Ferulic acid (trans- and cis-Ferulic acid) in the root base was 3–4 times higher than in the root tip. Cis-Ferulic acid represented between 2% (tip) and 18% (base) of the total Ferulic acid content. The total content of trans- and cis-Ferulic Acids was approximately the same in the stele and the cortex, but the level of cis-Ferulic acid in the stele was 5–6 times higher than in the cortex. Trans- and cis-Ferulic acid levels as well as the percentage of cis-Ferulic acid in the elongation zone were steady between 48 and 96 h after the beginning of germination. Slowly growing roots contained more wall-bound Ferulic Acids, particularly cis-Ferulic acid, than fast growing roots. This relationship was found in the differentiation zone but not in the elongation zone. The importance of cell wall-bound trans- and cis-Ferulic Acids is discussed in the context of root growth and differentiation.

  • Cell wall‐bound trans‐ and cis‐Ferulic Acids in growing maize roots
    Physiologia Plantarum, 1994
    Co-Authors: Roland Locher, Hilary V. Martin, René Grison, Paul-emile Pilet
    Abstract:

    The levels of cell wall-bound trans- and cis-Ferulic Acids in roots of dark grown Zea mays cv. LG11 plants were measured. They were quantified after alkaline hydrolysis of purified cell walls by reversed phase HPLC using trans-cinnamic acid as internal standard. The total amount of Ferulic acid (trans- and cis-Ferulic acid) in the root base was 3–4 times higher than in the root tip. Cis-Ferulic acid represented between 2% (tip) and 18% (base) of the total Ferulic acid content. The total content of trans- and cis-Ferulic Acids was approximately the same in the stele and the cortex, but the level of cis-Ferulic acid in the stele was 5–6 times higher than in the cortex. Trans- and cis-Ferulic acid levels as well as the percentage of cis-Ferulic acid in the elongation zone were steady between 48 and 96 h after the beginning of germination. Slowly growing roots contained more wall-bound Ferulic Acids, particularly cis-Ferulic acid, than fast growing roots. This relationship was found in the differentiation zone but not in the elongation zone. The importance of cell wall-bound trans- and cis-Ferulic Acids is discussed in the context of root growth and differentiation.

Hanwen Wu - One of the best experts on this subject based on the ideXlab platform.

  • allelochemicals in wheat triticum aestivum l variation of phenolic Acids in root tissues
    Journal of Agricultural and Food Chemistry, 2000
    Co-Authors: Hanwen Wu, Jim Pratley, Deirdre Lemerle, T Haig, Min An
    Abstract:

    : Analysis by GC/MS/MS showed that a worldwide collection of 58 wheat accessions differed significantly in the production of seven phenolic Acids in the roots of 17-day-old wheat seedlings. The allelochemical contents among wheat accessions ranged from 24.5 to 94.5, 19.9 to 91.7, 3.7 to 15.4, 2.2 to 38.6, 1.0 to 42.2, 19.3 to 183.6, and 11.7 to 187.6 mg/kg of root dry weight for p-hydroxybenzoic, vanillic, cis-p-coumaric, syringic, cis-Ferulic, trans-p-coumaric, and trans-Ferulic Acids, respectively. trans-Ferulic acid was identified as the most predominant phenolic acid in the roots. Phenolic Acids, with the exception of syringic acid, were more concentrated in roots than in shoots. Significant correlation was found between the roots and the shoots in the contents of vanillic, cis-p-coumaric, syringic, trans-p-coumaric, and trans-Ferulic Acids, and in the content of each structural group of phenolic Acids. Wheat accessions with high levels of total identified phenolic Acids in the roots were generally strongly allelopathic to the growth of annual ryegrass.

  • distribution and exudation of allelochemicals in wheat triticum aestivum
    Journal of Chemical Ecology, 2000
    Co-Authors: Hanwen Wu, Jim Pratley, Deirdre Lemerle, T Haig, Min An
    Abstract:

    Wheat allelopathy has potential for weed suppression. Allelochemicals were identified in wheat seedlings, and they were exuded from seedlings into agar growth medium. p-Hydroxybenzoic, trans-p-coumaric, cis-p-coumaric, syringic, vanillic, trans-Ferulic, and cis-Ferulic Acids and 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA) were identified in both the shoots and roots of 17-day-old wheat seedlings and their associated agar growth medium. Wheat accessions with previously identified allelopathic activity tended to contain higher levels of allelochemicals than poorly allelopathic ones. The allelopathic compounds present in the shoots generally also were identified in the roots and in the agar medium. Allelochemicals were distributed differentially in wheat, with roots normally containing higher levels of allelochemicals than the shoots. When the eight allelochemicals were grouped into benzoic acid and cinnamic acid derivatives, DIMBOA, total coumaric, and total Ferulic Acids, the amount of each group of allelochemicals was correlated between the roots and the shoots. Most of the allelochemicals identified in the shoots and roots could be exuded by the living roots of wheat seedling into the agar growth medium. However, the amounts of allelochemicals in the agar growth medium were not proportional to those in the roots. Results suggest that wheat plants may retain allelochemicals once synthesized. The presence of allelochemicals in the agar growth medium demonstrated that wheat seedlings were able to synthesize and to exude phytotoxic compounds through their root system that could inhibit the root growth of annual ryegrass.

Jim Pratley - One of the best experts on this subject based on the ideXlab platform.

  • biochemical basis for wheat seedling allelopathy on the suppression of annual ryegrass lolium rigidum
    Journal of Agricultural and Food Chemistry, 2002
    Co-Authors: Terrence Haig, Jim Pratley, Deirdre Lemerle
    Abstract:

    The chemical basis for wheat seedling allelopathy on the growth of annual ryegrass was investigated by the identification and quantification of multiple allelochemicals from wheat seedlings. Results indicated that 58 wheat accessions differed significantly in seedling allelopathy and inhibited the root growth of ryegrass from 10 to 91%, depending on accession. Analysis of allelochemicals by GC/MS/MS indicated that allelopathy was significantly correlated with the levels of measured allelochemicals in the shoots and roots of young wheat seedlings. Ryegrass root growth was also negatively correlated with the levels of p-hydroxybenzoic, vanillic, and trans-Ferulic Acids in root exudates. Wheat allelopathic potential was negatively correlated with the levels of the eight known allelochemicals quantified in the shoots, roots, and water−agar medium, with multiple regression coefficients (r) of −0.61, −0.71, and −0.71, respectively. In comparison with weakly allelopathic accessions, strongly allelopathic accessi...

  • allelochemicals in wheat triticum aestivum l variation of phenolic Acids in root tissues
    Journal of Agricultural and Food Chemistry, 2000
    Co-Authors: Hanwen Wu, Jim Pratley, Deirdre Lemerle, T Haig, Min An
    Abstract:

    : Analysis by GC/MS/MS showed that a worldwide collection of 58 wheat accessions differed significantly in the production of seven phenolic Acids in the roots of 17-day-old wheat seedlings. The allelochemical contents among wheat accessions ranged from 24.5 to 94.5, 19.9 to 91.7, 3.7 to 15.4, 2.2 to 38.6, 1.0 to 42.2, 19.3 to 183.6, and 11.7 to 187.6 mg/kg of root dry weight for p-hydroxybenzoic, vanillic, cis-p-coumaric, syringic, cis-Ferulic, trans-p-coumaric, and trans-Ferulic Acids, respectively. trans-Ferulic acid was identified as the most predominant phenolic acid in the roots. Phenolic Acids, with the exception of syringic acid, were more concentrated in roots than in shoots. Significant correlation was found between the roots and the shoots in the contents of vanillic, cis-p-coumaric, syringic, trans-p-coumaric, and trans-Ferulic Acids, and in the content of each structural group of phenolic Acids. Wheat accessions with high levels of total identified phenolic Acids in the roots were generally strongly allelopathic to the growth of annual ryegrass.

  • distribution and exudation of allelochemicals in wheat triticum aestivum
    Journal of Chemical Ecology, 2000
    Co-Authors: Hanwen Wu, Jim Pratley, Deirdre Lemerle, T Haig, Min An
    Abstract:

    Wheat allelopathy has potential for weed suppression. Allelochemicals were identified in wheat seedlings, and they were exuded from seedlings into agar growth medium. p-Hydroxybenzoic, trans-p-coumaric, cis-p-coumaric, syringic, vanillic, trans-Ferulic, and cis-Ferulic Acids and 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA) were identified in both the shoots and roots of 17-day-old wheat seedlings and their associated agar growth medium. Wheat accessions with previously identified allelopathic activity tended to contain higher levels of allelochemicals than poorly allelopathic ones. The allelopathic compounds present in the shoots generally also were identified in the roots and in the agar medium. Allelochemicals were distributed differentially in wheat, with roots normally containing higher levels of allelochemicals than the shoots. When the eight allelochemicals were grouped into benzoic acid and cinnamic acid derivatives, DIMBOA, total coumaric, and total Ferulic Acids, the amount of each group of allelochemicals was correlated between the roots and the shoots. Most of the allelochemicals identified in the shoots and roots could be exuded by the living roots of wheat seedling into the agar growth medium. However, the amounts of allelochemicals in the agar growth medium were not proportional to those in the roots. Results suggest that wheat plants may retain allelochemicals once synthesized. The presence of allelochemicals in the agar growth medium demonstrated that wheat seedlings were able to synthesize and to exude phytotoxic compounds through their root system that could inhibit the root growth of annual ryegrass.