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Soil Water Thresholds for Photoinduction of Redroot Pigweed Germination by Gallagher, Robert S. (author);Cardina, John (author) is a Agricultural and Biological Sciences article available to read on EtoBox.

What is Soil Water Thresholds for Photoinduction of Redroot Pigweed Germination about?

Perception of light by phytochrome is a mechanism that triggers weed seed germination in response to soil disturbance. Photoconversion of phytochrome from the red light absorbing form to the active far-red absorbing form depends on hydration of phytochrome. This research was conducted to determine the soil water threshold for the photoinduction of germination by the brief exposure of light that occurs during soil disturbance, and to determine how this threshold is affected by the fluence of the light stimulus and fluence sensitivity of the seed population. Redroot pigweed seedling emergence and germination response to red light (R) was studied for a range of water potentials. Water potential gradients were established by incubating seeds in soils wetted to various water contents, or in polyethylene glycol 8000 (PEG) solutions. After imposing the light treatments, seeds were returned to a fully hydrated state. Seedling emergence in response to R increased as the volumetric water content (θ~v~) of soils increased. At volumetric water contents of 4.0%, R-induced seedling emergence was inhibited 50% compared to photoinduced seedling emergence at the highest soil water contents tested.

Who reads Soil Water Thresholds for Photoinduction of Redroot Pigweed Germination?

Author

Gallagher, Robert S. (author);Cardina, John (author)

Publisher

Cambridge University Press (CUP)

Published

1997

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)