Sink strength regulates photosynthesis in sugarcane

A.J. Mccormick, Michael Cramer, D.A. Watt

    Research output: Contribution to journalArticle

    110 Citations (Scopus)

    Abstract

    The relationship in sugarcane (Saccharum spp.) between photosynthetic source tissue and sink material was examined through manipulation of the sink:source ratio of field-grown Saccharum spp. hybrid cv. N19 (N19).To enhance sink strength, all leaves, except for the third fully expanded leaf, were enclosed in 90% shade cloth for varying periods of time. Variations in sucrose, glucose and fructose concentrations were measured and the effects of shading on the leaf gas exchange and fluorescence characteristics recorded. Changes in carbon partitioning caused by shading were examined based on the uptake and translocation of fixed (CO2)-C-14.Following a decline in sucrose concentrations in young internodal tissue and shaded leaves, significant increases in the CO2-saturated photosynthetic rate (J(max)), carboxylation efficiency (CE) and electron transport rate were observed in unshaded leaves after 8 d of shading treatment.It was concluded that up-regulation of source-leaf photosynthetic capacity is correlated with a decrease in assimilate availability to acropetal culm sink tissue. Furthermore, a significant relationship was revealed between source hexose concentration and photosynthetic activity.
    Original languageEnglish
    Pages (from-to)759-770
    JournalNew Phytologist
    Volume171
    Issue number4
    DOIs
    Publication statusPublished - 2006

    Fingerprint

    Saccharum
    Photosynthesis
    sugarcane
    photosynthesis
    Sucrose
    shade
    leaves
    Hexoses
    Electron Transport
    Fructose
    Up-Regulation
    Carbon
    Fluorescence
    Gases
    sucrose
    Glucose
    carboxylation
    hexoses
    electron transfer
    gas exchange

    Cite this

    Mccormick, A.J. ; Cramer, Michael ; Watt, D.A. / Sink strength regulates photosynthesis in sugarcane. In: New Phytologist. 2006 ; Vol. 171, No. 4. pp. 759-770.
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    abstract = "The relationship in sugarcane (Saccharum spp.) between photosynthetic source tissue and sink material was examined through manipulation of the sink:source ratio of field-grown Saccharum spp. hybrid cv. N19 (N19).To enhance sink strength, all leaves, except for the third fully expanded leaf, were enclosed in 90{\%} shade cloth for varying periods of time. Variations in sucrose, glucose and fructose concentrations were measured and the effects of shading on the leaf gas exchange and fluorescence characteristics recorded. Changes in carbon partitioning caused by shading were examined based on the uptake and translocation of fixed (CO2)-C-14.Following a decline in sucrose concentrations in young internodal tissue and shaded leaves, significant increases in the CO2-saturated photosynthetic rate (J(max)), carboxylation efficiency (CE) and electron transport rate were observed in unshaded leaves after 8 d of shading treatment.It was concluded that up-regulation of source-leaf photosynthetic capacity is correlated with a decrease in assimilate availability to acropetal culm sink tissue. Furthermore, a significant relationship was revealed between source hexose concentration and photosynthetic activity.",
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    Mccormick, AJ, Cramer, M & Watt, DA 2006, 'Sink strength regulates photosynthesis in sugarcane' New Phytologist, vol. 171, no. 4, pp. 759-770. https://doi.org/10.1111/j.1469-8137.2006.01785.x

    Sink strength regulates photosynthesis in sugarcane. / Mccormick, A.J.; Cramer, Michael; Watt, D.A.

    In: New Phytologist, Vol. 171, No. 4, 2006, p. 759-770.

    Research output: Contribution to journalArticle

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    AU - Mccormick, A.J.

    AU - Cramer, Michael

    AU - Watt, D.A.

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    N2 - The relationship in sugarcane (Saccharum spp.) between photosynthetic source tissue and sink material was examined through manipulation of the sink:source ratio of field-grown Saccharum spp. hybrid cv. N19 (N19).To enhance sink strength, all leaves, except for the third fully expanded leaf, were enclosed in 90% shade cloth for varying periods of time. Variations in sucrose, glucose and fructose concentrations were measured and the effects of shading on the leaf gas exchange and fluorescence characteristics recorded. Changes in carbon partitioning caused by shading were examined based on the uptake and translocation of fixed (CO2)-C-14.Following a decline in sucrose concentrations in young internodal tissue and shaded leaves, significant increases in the CO2-saturated photosynthetic rate (J(max)), carboxylation efficiency (CE) and electron transport rate were observed in unshaded leaves after 8 d of shading treatment.It was concluded that up-regulation of source-leaf photosynthetic capacity is correlated with a decrease in assimilate availability to acropetal culm sink tissue. Furthermore, a significant relationship was revealed between source hexose concentration and photosynthetic activity.

    AB - The relationship in sugarcane (Saccharum spp.) between photosynthetic source tissue and sink material was examined through manipulation of the sink:source ratio of field-grown Saccharum spp. hybrid cv. N19 (N19).To enhance sink strength, all leaves, except for the third fully expanded leaf, were enclosed in 90% shade cloth for varying periods of time. Variations in sucrose, glucose and fructose concentrations were measured and the effects of shading on the leaf gas exchange and fluorescence characteristics recorded. Changes in carbon partitioning caused by shading were examined based on the uptake and translocation of fixed (CO2)-C-14.Following a decline in sucrose concentrations in young internodal tissue and shaded leaves, significant increases in the CO2-saturated photosynthetic rate (J(max)), carboxylation efficiency (CE) and electron transport rate were observed in unshaded leaves after 8 d of shading treatment.It was concluded that up-regulation of source-leaf photosynthetic capacity is correlated with a decrease in assimilate availability to acropetal culm sink tissue. Furthermore, a significant relationship was revealed between source hexose concentration and photosynthetic activity.

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