Sink strength regulates photosynthesis in sugarcane

McCormick, Alistair J.; Cramer, Michael D.; Watt, D. A.

doi:10.1111/j.1469-8137.2006.01785.x

Cited by 195 publications

(146 citation statements)

References 75 publications

(87 reference statements)

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“…As observed in sugarcane, decreased hexose levels in leaves may act a signal for increased sink demand, reducing a negative feedback regulation of photosynthesis [26], and hexoses, rather than sucrose, could be involved in this regulation [27]. In the same way, our results indicates a negative correlation of hexose levels between source leaves and mature internode of HS and LS plants, (Fig.…”

Section: Discussionsupporting

confidence: 72%

Expression Profile of Signal Transduction Components in a Sugarcane Population Segregating for Sugar Content

Felix

Papini-Terzi

Rocha

et al. 2009

Tropical Plant Biol.

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Sucrose is the major product of photosynthesis in many higher plants. It is transported from the source tissue through the phloem to various sink tissues to support plant growth, development and reproduction. Knowledge on the signal transduction pathways involved in sucrose synthesis in mature leaves is limited. Using a microarray approach, we analyzed the expression profiles of 1920 sugarcane genes encoding signal transduction elements, transcription factors and stress-related proteins. We used individuals from a population segregating for sugar content and gene expression profiles were obtained from seven individuals with highest and seven with lowest sugar content. Surprisingly, from the 24 differentially expressed genes, 19 were more expressed in plants containing low-sugar content. Three of these genes encoded 14-3-3 like proteins, which have been found to reduce sucrose phosphate synthase (SPS) activity. Another encoded an SNF1-related protein similar to a protein kinase that phosphorylates SPS in vitro making it a target for the interaction with 14-3-3 proteins. The up-regulation of eight stress related genes in the lower sugar content plants supports a view that sugar levels modulate a complex signal transduction network that seems to involve responses that are related to stress. Evidence that hormone signaling is related to the sucrose content was also found. These data reinforced the usefulness of genomic approaches to uncover how sucrose metabolism can be regulated in sugarcane.

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Section: Discussionsupporting

confidence: 72%

Expression Profile of Signal Transduction Components in a Sugarcane Population Segregating for Sugar Content

Felix

Papini-Terzi

Rocha

et al. 2009

Tropical Plant Biol.

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“…The accumulation of starch and soluble sugars can have a negative impact on photosynthetic rates, as they affect the rate at which P i is recycled through the reactions of photosynthesis (Paul and Foyer, 2001;McCormick et al, 2006). As such, the nonstructural carbohydrate constituents (starch, Glc, and Fru) of leaf tissue were found to be significantly increased in the C3#H-RNAi trees.…”

Section: Discussionmentioning

confidence: 86%

Perturbed Lignification Impacts Tree Growth in Hybrid Poplar—A Function of Sink Strength, Vascular Integrity, and Photosynthetic Assimilation

et al. 2008

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The effects of reductions in cell wall lignin content, manifested by RNA interference suppression of coumaroyl 3#-hydroxylase, on plant growth, water transport, gas exchange, and photosynthesis were evaluated in hybrid poplar trees (Populus alba 3 grandidentata). The growth characteristics of the reduced lignin trees were significantly impaired, resulting in smaller stems and reduced root biomass when compared to wild-type trees, as well as altered leaf morphology and architecture. The severe inhibition of cell wall lignification produced trees with a collapsed xylem phenotype, resulting in compromised vascular integrity, and displayed reduced hydraulic conductivity and a greater susceptibility to wall failure and cavitation. In the reduced lignin trees, photosynthetic carbon assimilation and stomatal conductance were also greatly reduced, however, shoot xylem pressure potential and carbon isotope discrimination were higher and water-use efficiency was lower, inconsistent with water stress. Reductions in assimilation rate could not be ascribed to increased stomatal limitation. Starch and soluble sugars analysis of leaves revealed that photosynthate was accumulating to high levels, suggesting that the trees with substantially reduced cell wall lignin were not carbon limited and that reductions in sink strength were, instead, limiting photosynthesis.

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“…Indeed, the activity of enzymes involved in photosynthesis and the expression of their transcripts are modulated by sink strength. In sugarcane, the accumulation of sucrose in the maturing and mature internodes of the stem contribute greatly to sink strength [27]. Kinetic models have been proposed to explain sucrose accumulation in sugarcane [35,41].…”

Section: Function Of Genes With Elevated Expression In Sweet Sorghummentioning

confidence: 99%

Screen of Genes Linked to High-Sugar Content in Stems by Comparative Genomics

Calviño

Bruggmann

Messing

2008

Rice

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One of the great advantages of the fully sequenced rice genome is to serve as a reference for other cereal genomes in particular for identifying genes linked to unique traits. A trait of great interest is reduced lignocellulose in the stem of related species in favor of fermentable sugars as a source of biofuels. While sugarcane is one of the most efficient biofuel crops, little is known about the underlying gene repertoire involved in it. Here, we take advantage of the natural variation of sweet and grain sorghum to uncover genes that are conserved in rice, sorghum, and sugarcane but differently expressed in sweet versus grain sorghum by using a microarray platform and the syntenous alignment of rice and sorghum genomic regions containing these genes. Indeed, enzymes involved in carbohydrate accumulation and those that reduce lignocellulose can be identified.

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Sink strength regulates photosynthesis in sugarcane

Cited by 195 publications

References 75 publications

Expression Profile of Signal Transduction Components in a Sugarcane Population Segregating for Sugar Content

Expression Profile of Signal Transduction Components in a Sugarcane Population Segregating for Sugar Content

Perturbed Lignification Impacts Tree Growth in Hybrid Poplar—A Function of Sink Strength, Vascular Integrity, and Photosynthetic Assimilation

Screen of Genes Linked to High-Sugar Content in Stems by Comparative Genomics

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