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Interference between healthy and rusted groundsel (Senecio-Vulgaris L) within mixed populations of different densities and proportions

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Interference between healthy and rusted groundsel (Senecio-Vulgaris L) within mixed populations of different densities and proportions. / Paul, Nigel; AYRES, P G .
In: New Phytologist, Vol. 104, No. 2, 10.1986, p. 257-269.

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@article{90e8c4ed993f4599bc71608ca4b7edfa,
title = "Interference between healthy and rusted groundsel (Senecio-Vulgaris L) within mixed populations of different densities and proportions",
abstract = "Plants of groundsel (Senecio vulgaris L.), either inoculated with rust Puccinia lagenophorae Cooke or uninoculated, were grown to capitulum production at a range of densities up to 2240 plants m−2, both in monoculture and together in mixture. Rust infection reduced vegetative growth and capitulum production in monocultures and mixtures. However, in mixture, unequal interference between inoculated and uninoculated plants amplified the effect of rust infection on growth. The relative crowding coefficient of uninoculated over rusted groundsel consistently exceeded unity but showed no clear trend in response to planting density. Rust infection resulted in bimodal frequency distributions of plant height, particularly in mixture, i.e. many rusted plants were stunted and were confined to the lowest layers of the shoot canopy. Thus, the reduced yield of the inoculated component of mixtures resulted from the very severe inhibition of growth of a proportion of rusted plants. However, it appeared that suppressed, rusted plants remained able to respond to limitation of available resources since both dry weight partitioning to the roots and specific leaf area increased. Perhaps because of the ability of groundsel to adapt to unfavourable environmental conditions, rust infection resulted in little mortality. Thus, even heavily rusted suppressed plants were able to produce some capitula and, potentially, seed.",
keywords = "Senecio vulgaris (groundsel), Puccinia lagenophorae , planting density , intra-specific interference, population structure",
author = "Nigel Paul and AYRES, {P G}",
year = "1986",
month = oct,
doi = "10.1111/j.1469-8137.1986.tb00650.x",
language = "English",
volume = "104",
pages = "257--269",
journal = "New Phytologist",
issn = "0028-646X",
publisher = "Wiley",
number = "2",

}

RIS

TY - JOUR

T1 - Interference between healthy and rusted groundsel (Senecio-Vulgaris L) within mixed populations of different densities and proportions

AU - Paul, Nigel

AU - AYRES, P G

PY - 1986/10

Y1 - 1986/10

N2 - Plants of groundsel (Senecio vulgaris L.), either inoculated with rust Puccinia lagenophorae Cooke or uninoculated, were grown to capitulum production at a range of densities up to 2240 plants m−2, both in monoculture and together in mixture. Rust infection reduced vegetative growth and capitulum production in monocultures and mixtures. However, in mixture, unequal interference between inoculated and uninoculated plants amplified the effect of rust infection on growth. The relative crowding coefficient of uninoculated over rusted groundsel consistently exceeded unity but showed no clear trend in response to planting density. Rust infection resulted in bimodal frequency distributions of plant height, particularly in mixture, i.e. many rusted plants were stunted and were confined to the lowest layers of the shoot canopy. Thus, the reduced yield of the inoculated component of mixtures resulted from the very severe inhibition of growth of a proportion of rusted plants. However, it appeared that suppressed, rusted plants remained able to respond to limitation of available resources since both dry weight partitioning to the roots and specific leaf area increased. Perhaps because of the ability of groundsel to adapt to unfavourable environmental conditions, rust infection resulted in little mortality. Thus, even heavily rusted suppressed plants were able to produce some capitula and, potentially, seed.

AB - Plants of groundsel (Senecio vulgaris L.), either inoculated with rust Puccinia lagenophorae Cooke or uninoculated, were grown to capitulum production at a range of densities up to 2240 plants m−2, both in monoculture and together in mixture. Rust infection reduced vegetative growth and capitulum production in monocultures and mixtures. However, in mixture, unequal interference between inoculated and uninoculated plants amplified the effect of rust infection on growth. The relative crowding coefficient of uninoculated over rusted groundsel consistently exceeded unity but showed no clear trend in response to planting density. Rust infection resulted in bimodal frequency distributions of plant height, particularly in mixture, i.e. many rusted plants were stunted and were confined to the lowest layers of the shoot canopy. Thus, the reduced yield of the inoculated component of mixtures resulted from the very severe inhibition of growth of a proportion of rusted plants. However, it appeared that suppressed, rusted plants remained able to respond to limitation of available resources since both dry weight partitioning to the roots and specific leaf area increased. Perhaps because of the ability of groundsel to adapt to unfavourable environmental conditions, rust infection resulted in little mortality. Thus, even heavily rusted suppressed plants were able to produce some capitula and, potentially, seed.

KW - Senecio vulgaris (groundsel)

KW - Puccinia lagenophorae

KW - planting density

KW - intra-specific interference

KW - population structure

U2 - 10.1111/j.1469-8137.1986.tb00650.x

DO - 10.1111/j.1469-8137.1986.tb00650.x

M3 - Journal article

VL - 104

SP - 257

EP - 269

JO - New Phytologist

JF - New Phytologist

SN - 0028-646X

IS - 2

ER -