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Palmer Amaranth (Amaranthus palmeri) - eXtension

Ecophysiology of Amaranthus palmeri, ..

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Ecophysiology of Amaranthus palmeri, a Sonoran Desert ..

Photosynthetic rates of Palmer amaranth grown under 47%% shade increased with increasing photosynthetic active radiation (PAR) similar to 0%% shade-grown plants.

Nomenclature: Glufosinate; Palmer amaranth, Amaranthus palmeri S
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AMARANTH Amaranth is a broad-leafed plant but it produces an edible, cereal-like grain, as dograsses such as wheat, rice, rye, and barley. (Rodale Press. Inc.)

Palmer Amaranth (Amaranthus palmeri) Competition …

Oxygen inhibition of photosynthesis in the C4 species Amaranthus graecizans L
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AMARANTH The Codex Mendoza, commissioned by the Spanish viceroy Antonio de Mendoza inabout 1541, reveals that for two-thirds of the towns of the Aztec empire amaranth wasa required part of the annual tribute paid to the emperor Montezuma II. The page shownabove lists six towns in the left column and specifies theirtribute: four bales of nennequenor cotton mantles in the designs shown; one war dress and shelf with rich feather trim;twenty war dresses with common feather trim; two wooden bins of maize and amaranth;two bins of beans and chia (another little-known Aztec crop); 2,000 salt loaves. Featherysymbols above drawings mean 400. (Drawing courtesy Organization of American States)

AB - Basic photosynthetic and water relations characteristics in relation to soil water availability were investigated in Amaranthus palmeri, a common C4 summer annual of the Sonoran Desert. Under conditions of high soil water availability, photosynthetic capacity exceeded 70 μmol CO2 m-2 s-1 at a leaf temperature optimum of 42°C, and photosynthesis was not light saturated at an irradiance of 2.0 mmol m-2 s-1 (400-700 nm). Leaves of A. palmeri exhibited diaheliotropic movements, allowing them to take advantage of their high photosynthetic capacity. In response to a long term drought cycle, both photosynthetic rate and leaf conductance to water vapor decreased, reaching minima at an approximate leaf water potential of-2.9 MPa. Active leaf osmotic adjustment appeared to play an important role in allowing leaves to maintain gas exchange activities down to these low leaf water potentials. The photosynthetic rate became light saturated at the lower leaf water potentials. Although the two parameters decreased in concert, the decreased photosynthetic rate was not due to increased stomatal diffusion limitations, since intercellular CO2 concentrations remained constant over the range of leaf water potentials. Instead it appeared that during the drought cycle, both intrinsic photosynthetic capacity and leaf protein content decreased as well. These results suggested a coordination of gas exchange parameters during long term drought such that the intercellular CO2 concentration remained constant.

Acclimation of Palmer Amaranth (Amaranthus palmeri) …

Photosynthetic efficiency of Amaranthus hybridus …
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INTRODUCTION Amaranth greens are a popular vegetable, grown throughout much of the tropics. Herein Benin, West Africa, a village woman uses palm leaves and a bowl of water to sprinklethe amaranth bed in her home garden. (G.J.H. Grubben)

N2 - Basic photosynthetic and water relations characteristics in relation to soil water availability were investigated in Amaranthus palmeri, a common C4 summer annual of the Sonoran Desert. Under conditions of high soil water availability, photosynthetic capacity exceeded 70 μmol CO2 m-2 s-1 at a leaf temperature optimum of 42°C, and photosynthesis was not light saturated at an irradiance of 2.0 mmol m-2 s-1 (400-700 nm). Leaves of A. palmeri exhibited diaheliotropic movements, allowing them to take advantage of their high photosynthetic capacity. In response to a long term drought cycle, both photosynthetic rate and leaf conductance to water vapor decreased, reaching minima at an approximate leaf water potential of-2.9 MPa. Active leaf osmotic adjustment appeared to play an important role in allowing leaves to maintain gas exchange activities down to these low leaf water potentials. The photosynthetic rate became light saturated at the lower leaf water potentials. Although the two parameters decreased in concert, the decreased photosynthetic rate was not due to increased stomatal diffusion limitations, since intercellular CO2 concentrations remained constant over the range of leaf water potentials. Instead it appeared that during the drought cycle, both intrinsic photosynthetic capacity and leaf protein content decreased as well. These results suggested a coordination of gas exchange parameters during long term drought such that the intercellular CO2 concentration remained constant.

Amaranthus palmeri - Species Page - NYFA: New York …
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Effects of Amaranthus hybridus and A

Basic photosynthetic and water relations characteristics in relation to soil water availability were investigated in Amaranthus palmeri, a common C4 summer annual of the Sonoran Desert. Under conditions of high soil water availability, photosynthetic capacity exceeded 70 μmol CO2 m-2 s-1 at a leaf temperature optimum of 42°C, and photosynthesis was not light saturated at an irradiance of 2.0 mmol m-2 s-1 (400-700 nm). Leaves of A. palmeri exhibited diaheliotropic movements, allowing them to take advantage of their high photosynthetic capacity. In response to a long term drought cycle, both photosynthetic rate and leaf conductance to water vapor decreased, reaching minima at an approximate leaf water potential of-2.9 MPa. Active leaf osmotic adjustment appeared to play an important role in allowing leaves to maintain gas exchange activities down to these low leaf water potentials. The photosynthetic rate became light saturated at the lower leaf water potentials. Although the two parameters decreased in concert, the decreased photosynthetic rate was not due to increased stomatal diffusion limitations, since intercellular CO2 concentrations remained constant over the range of leaf water potentials. Instead it appeared that during the drought cycle, both intrinsic photosynthetic capacity and leaf protein content decreased as well. These results suggested a coordination of gas exchange parameters during long term drought such that the intercellular CO2 concentration remained constant.

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