Leaf senescence in a non-yellowing mutant of Festuca pratensisimplications of the stay-green mutation for photosynthesis, growth and nutrition

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Leaf senescence in a non-yellowing mutant of Festuca pratensis : implications of the stay-green mutation for photosynthesis, growth and nutrition . / Hauck, Barbara; Gay, Alan; Macduff, James; Griffiths, C. M.; Thomas, Howard.

In: Plant, Cell and Environment, Vol. 20, No. 8, 08.1997, p. 1007-1018.

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@article{6b232cd2cffa4f64a707d00a3d1cef82,
title = "Leaf senescence in a non-yellowing mutant of Festuca pratensis: implications of the stay-green mutation for photosynthesis, growth and nutrition ",
abstract = "Mutation of the nuclear gene sid disables chlorophyll degradation during leaf senescence in the pasture grass Festuca pratensis. This study investigated the effect of the mutation on photosynthesis and on leaf and whole plant growth under a range of nitrogen regimes. When plants were cultivated in a static hydroponic system, the chlorophyll content of fourth leaves of the stay-green mutant Bf993 remained virtually unchanged from full expansion to complete senescence, while tissue of the wild-type (cv. Rossa) became completely yellow. The retention of chlorophyll in Bf993 was not associated with maintenance of photosynthetic activity as shown by rates of light-saturated CO2 fixation and apparent quantum efficiency. Higher levels of total N in senescing leaves of Bf993 than in Rossa indicated reduced nitrogen remobilization in the mutant. When using a range of [NH4NO3], dry matter production and tillering Mere lower for Bf993 at all but the highest [NH4NO3, which was supra-optimal for the wild type. In contrast to the static system, where fluctuations in N supply occurred, growth and [NO3−] uptake were similar in mutant and wild type when [NO3−] was continuously maintained by a flowing solution culture system. The results are discussed in relation to the role of N supply and the effect of the stay-green mutation on N recycling.",
keywords = "chlorophyll, Festuca pratensis, Gramineae, leaf senescence, meadow fescue, nitrogen nutrition, photosynthesis, stay-green mutant",
author = "Barbara Hauck and Alan Gay and James Macduff and Griffiths, {C. M.} and Howard Thomas",
year = "1997",
month = aug,
doi = "10.1111/j.1365-3040.1997.tb00677.x",
language = "English",
volume = "20",
pages = "1007--1018",
journal = "Plant, Cell and Environment",
issn = "0140-7791",
publisher = "Wiley",
number = "8",

}

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TY - JOUR

T1 - Leaf senescence in a non-yellowing mutant of Festuca pratensis

T2 - implications of the stay-green mutation for photosynthesis, growth and nutrition

AU - Hauck, Barbara

AU - Gay, Alan

AU - Macduff, James

AU - Griffiths, C. M.

AU - Thomas, Howard

PY - 1997/8

Y1 - 1997/8

N2 - Mutation of the nuclear gene sid disables chlorophyll degradation during leaf senescence in the pasture grass Festuca pratensis. This study investigated the effect of the mutation on photosynthesis and on leaf and whole plant growth under a range of nitrogen regimes. When plants were cultivated in a static hydroponic system, the chlorophyll content of fourth leaves of the stay-green mutant Bf993 remained virtually unchanged from full expansion to complete senescence, while tissue of the wild-type (cv. Rossa) became completely yellow. The retention of chlorophyll in Bf993 was not associated with maintenance of photosynthetic activity as shown by rates of light-saturated CO2 fixation and apparent quantum efficiency. Higher levels of total N in senescing leaves of Bf993 than in Rossa indicated reduced nitrogen remobilization in the mutant. When using a range of [NH4NO3], dry matter production and tillering Mere lower for Bf993 at all but the highest [NH4NO3, which was supra-optimal for the wild type. In contrast to the static system, where fluctuations in N supply occurred, growth and [NO3−] uptake were similar in mutant and wild type when [NO3−] was continuously maintained by a flowing solution culture system. The results are discussed in relation to the role of N supply and the effect of the stay-green mutation on N recycling.

AB - Mutation of the nuclear gene sid disables chlorophyll degradation during leaf senescence in the pasture grass Festuca pratensis. This study investigated the effect of the mutation on photosynthesis and on leaf and whole plant growth under a range of nitrogen regimes. When plants were cultivated in a static hydroponic system, the chlorophyll content of fourth leaves of the stay-green mutant Bf993 remained virtually unchanged from full expansion to complete senescence, while tissue of the wild-type (cv. Rossa) became completely yellow. The retention of chlorophyll in Bf993 was not associated with maintenance of photosynthetic activity as shown by rates of light-saturated CO2 fixation and apparent quantum efficiency. Higher levels of total N in senescing leaves of Bf993 than in Rossa indicated reduced nitrogen remobilization in the mutant. When using a range of [NH4NO3], dry matter production and tillering Mere lower for Bf993 at all but the highest [NH4NO3, which was supra-optimal for the wild type. In contrast to the static system, where fluctuations in N supply occurred, growth and [NO3−] uptake were similar in mutant and wild type when [NO3−] was continuously maintained by a flowing solution culture system. The results are discussed in relation to the role of N supply and the effect of the stay-green mutation on N recycling.

KW - chlorophyll

KW - Festuca pratensis

KW - Gramineae

KW - leaf senescence

KW - meadow fescue

KW - nitrogen nutrition

KW - photosynthesis

KW - stay-green mutant

UR - http://hdl.handle.net/2160/43161

U2 - 10.1111/j.1365-3040.1997.tb00677.x

DO - 10.1111/j.1365-3040.1997.tb00677.x

M3 - Article

VL - 20

SP - 1007

EP - 1018

JO - Plant, Cell and Environment

JF - Plant, Cell and Environment

SN - 0140-7791

IS - 8

ER -

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