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The Effects of Nutrient Deficiency and Rust Infection on the Relationship Between Root Dry Weight and Length in Groundsel (Senecio vulgaris L.)

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The Effects of Nutrient Deficiency and Rust Infection on the Relationship Between Root Dry Weight and Length in Groundsel (Senecio vulgaris L.). / Paul, Nigel; AYRES, P G .
In: Annals of Botany, Vol. 57, No. 3, 03.1986, p. 353-360.

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@article{c7a6532c28f641b78bd0945130201d06,
title = "The Effects of Nutrient Deficiency and Rust Infection on the Relationship Between Root Dry Weight and Length in Groundsel (Senecio vulgaris L.)",
abstract = "Groundsel (Senecio vulgaris L.) was grown in sand culture at a range of nutrient concentrations. Except when nutrient deficiency was severe, infection by the rust fungus Puccinia lagenophorae Cooke substantially reduced root dry weight but had little effect on root length. Thus, specific root length (SRL, cm root mg−1 d. wt) was significantly increased in rust-infected plants. The inhibition of root dry weight caused by rust infection was most pronounced late in development, especially after flowering when, in control plants, root elongation but not dry weight accumulation ceased. In rusted plants, and in all plants subjected to severe nutrient deficiency, dry weight accumulation in the roots ceased concurrently with root elongation. Late in development at high nutrient concentration adventitious roots with low SRLs were produced. However, infection did not modify the production of such roots and increases in SRL could not be attributed to changes in any single type of root.There was an inverse relationship between SRL and root diameter. This relationship was unaffected by rust infection whilst nutrient deficiency changed only its intercept: at a given SRL roots of nutrient stressed plants were thinner than those of plants with adequate nutrient supply. Thus, the smaller diameter of roots of nutrient-stressed plants occurred independently of measured changes in SRL but, in the absence of nutrient stress, the decrease in root diameter caused by rust was closely related to increases in SRL.Changes in the root: length relationships in rusted plants may have important implications for root activity in the field. In view of the reported changes in SRL, inhibition of root growth in terms of dry weight may be a poor indicator of potential changes in activity.",
keywords = "Senecio vulgaris , Rust infection , nutrient deficiency , root weight: length ratio, root diameter",
author = "Nigel Paul and AYRES, {P G}",
year = "1986",
month = mar,
language = "English",
volume = "57",
pages = "353--360",
journal = "Annals of Botany",
issn = "1095-8290",
publisher = "OXFORD UNIV PRESS",
number = "3",

}

RIS

TY - JOUR

T1 - The Effects of Nutrient Deficiency and Rust Infection on the Relationship Between Root Dry Weight and Length in Groundsel (Senecio vulgaris L.)

AU - Paul, Nigel

AU - AYRES, P G

PY - 1986/3

Y1 - 1986/3

N2 - Groundsel (Senecio vulgaris L.) was grown in sand culture at a range of nutrient concentrations. Except when nutrient deficiency was severe, infection by the rust fungus Puccinia lagenophorae Cooke substantially reduced root dry weight but had little effect on root length. Thus, specific root length (SRL, cm root mg−1 d. wt) was significantly increased in rust-infected plants. The inhibition of root dry weight caused by rust infection was most pronounced late in development, especially after flowering when, in control plants, root elongation but not dry weight accumulation ceased. In rusted plants, and in all plants subjected to severe nutrient deficiency, dry weight accumulation in the roots ceased concurrently with root elongation. Late in development at high nutrient concentration adventitious roots with low SRLs were produced. However, infection did not modify the production of such roots and increases in SRL could not be attributed to changes in any single type of root.There was an inverse relationship between SRL and root diameter. This relationship was unaffected by rust infection whilst nutrient deficiency changed only its intercept: at a given SRL roots of nutrient stressed plants were thinner than those of plants with adequate nutrient supply. Thus, the smaller diameter of roots of nutrient-stressed plants occurred independently of measured changes in SRL but, in the absence of nutrient stress, the decrease in root diameter caused by rust was closely related to increases in SRL.Changes in the root: length relationships in rusted plants may have important implications for root activity in the field. In view of the reported changes in SRL, inhibition of root growth in terms of dry weight may be a poor indicator of potential changes in activity.

AB - Groundsel (Senecio vulgaris L.) was grown in sand culture at a range of nutrient concentrations. Except when nutrient deficiency was severe, infection by the rust fungus Puccinia lagenophorae Cooke substantially reduced root dry weight but had little effect on root length. Thus, specific root length (SRL, cm root mg−1 d. wt) was significantly increased in rust-infected plants. The inhibition of root dry weight caused by rust infection was most pronounced late in development, especially after flowering when, in control plants, root elongation but not dry weight accumulation ceased. In rusted plants, and in all plants subjected to severe nutrient deficiency, dry weight accumulation in the roots ceased concurrently with root elongation. Late in development at high nutrient concentration adventitious roots with low SRLs were produced. However, infection did not modify the production of such roots and increases in SRL could not be attributed to changes in any single type of root.There was an inverse relationship between SRL and root diameter. This relationship was unaffected by rust infection whilst nutrient deficiency changed only its intercept: at a given SRL roots of nutrient stressed plants were thinner than those of plants with adequate nutrient supply. Thus, the smaller diameter of roots of nutrient-stressed plants occurred independently of measured changes in SRL but, in the absence of nutrient stress, the decrease in root diameter caused by rust was closely related to increases in SRL.Changes in the root: length relationships in rusted plants may have important implications for root activity in the field. In view of the reported changes in SRL, inhibition of root growth in terms of dry weight may be a poor indicator of potential changes in activity.

KW - Senecio vulgaris

KW - Rust infection

KW - nutrient deficiency

KW - root weight: length ratio

KW - root diameter

M3 - Journal article

VL - 57

SP - 353

EP - 360

JO - Annals of Botany

JF - Annals of Botany

SN - 1095-8290

IS - 3

ER -