Supply and demand: sink regulation of sugar accumulation in sugarcane

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

    Research output: Contribution to journalArticle

    70 Citations (Scopus)

    Abstract

    Sugarcane (Saccharum spp. hybrids) accumulates sucrose to high concentrations and, as a result, has been the focus of extensive research into the biochemistry and physiology of sucrose accumulation. Despite this, the relationship between source leaf photosynthetic activity and sucrose accumulation in the culm sink is not well understood. The observations that photosynthetic activity declines during culm maturation in commercial cultivars and that high-sucrose-accumulating noble ancestral genotypes (Saccharum officinarum L.) photosynthesize at rates two-thirds of those of low-sucrose ancestors (Saccharum spontaneum L.) indicate that source–sink communication may play a pivotal role in determining sucrose yield. Although maturation of the culm results in a decreased demand for sucrose, recent evidence from partial leaf shading, defoliation, and transgenic studies indicates that sugarcane cultivars are capable of further increases in sugar content. Furthermore, sugarcane leaves appear to retain the capacity to increase the supply of assimilate to culm tissues under conditions of increased assimilate demand. The relationship between source and sink tissues in sugarcane should be viewed within a supply–demand paradigm; an often neglected conceptual approach in the study of this crop. Uncoupling of the signalling pathways that mediate negative feedback between source and sink tissues may result in improved leaf assimilation rates and, consequently, lead to increased sugarcane sucrose yields.
    Original languageEnglish
    Pages (from-to)357-364
    JournalJournal of Experimental Botany
    Volume60
    Issue number2
    DOIs
    Publication statusPublished - 2009

    Fingerprint

    Saccharum
    supply balance
    sugarcane
    Sucrose
    sucrose
    sugars
    leaves
    Saccharum spontaneum
    Saccharum officinarum
    cultivars
    defoliation
    Biochemistry
    biochemistry
    sugar content
    assimilation (physiology)
    shade
    ancestry
    physiology
    Genotype
    genetically modified organisms

    Cite this

    Mccormick, A.J. ; Watt, D.A. ; Cramer, Michael. / Supply and demand: sink regulation of sugar accumulation in sugarcane. In: Journal of Experimental Botany. 2009 ; Vol. 60, No. 2. pp. 357-364.
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    abstract = "Sugarcane (Saccharum spp. hybrids) accumulates sucrose to high concentrations and, as a result, has been the focus of extensive research into the biochemistry and physiology of sucrose accumulation. Despite this, the relationship between source leaf photosynthetic activity and sucrose accumulation in the culm sink is not well understood. The observations that photosynthetic activity declines during culm maturation in commercial cultivars and that high-sucrose-accumulating noble ancestral genotypes (Saccharum officinarum L.) photosynthesize at rates two-thirds of those of low-sucrose ancestors (Saccharum spontaneum L.) indicate that source–sink communication may play a pivotal role in determining sucrose yield. Although maturation of the culm results in a decreased demand for sucrose, recent evidence from partial leaf shading, defoliation, and transgenic studies indicates that sugarcane cultivars are capable of further increases in sugar content. Furthermore, sugarcane leaves appear to retain the capacity to increase the supply of assimilate to culm tissues under conditions of increased assimilate demand. The relationship between source and sink tissues in sugarcane should be viewed within a supply–demand paradigm; an often neglected conceptual approach in the study of this crop. Uncoupling of the signalling pathways that mediate negative feedback between source and sink tissues may result in improved leaf assimilation rates and, consequently, lead to increased sugarcane sucrose yields.",
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    Supply and demand: sink regulation of sugar accumulation in sugarcane. / Mccormick, A.J.; Watt, D.A.; Cramer, Michael.

    In: Journal of Experimental Botany, Vol. 60, No. 2, 2009, p. 357-364.

    Research output: Contribution to journalArticle

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    AU - Watt, D.A.

    AU - Cramer, Michael

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