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Suboptimal light conditions influence source-sink metabolism during flowering

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Abstract
Reliance on carbohydrates during flower forcing was investigated in one early and one late flowering cultivar of azalea (Rhododendron simsii hybrids). Carbohydrate accumulation, invertase activity, and expression of a purported sucrose synthase gene (RsSUS) was monitored during flower forcing under suboptimal (natural) and optimal (supplemental light) light conditions, after a cold treatment (7 degrees C + dark) to break flower bud dormancy. Post-production sucrose metabolism and flowering quality was also assessed. Glucose and fructose concentrations and invertase activity increased in petals during flowering, while sucrose decreased. In suboptimal light conditions RsSUS expression in leaves increased as compared to optimal light conditions, indicating that plants in suboptimal light conditions have a strong demand for carbohydrates. However, carbohydrates in leaves were markedly lower in suboptimal light conditions compared to optimal light conditions. This resulted in poor flowering of plants in suboptimal light conditions. Post production flowering relied on the stored leaf carbon, which could be accumulated under optimal light conditions in the greenhouse. These results show that flower opening in azalea relies on carbohydrates imported from leaves and is source-limiting under suboptimal light conditions.
Keywords
TOMATO FRUIT, source-sink, PETAL GROWTH, GENE, SENESCENCE, PLANTS, EXPRESSION, STALK ELONGATION, CELL-DIVISION, ROSA-HYBRIDA L., SUCROSE SYNTHASE, flowering, azalea, Rhododendron simsii, supplemental light, sucrose synthase, invertase

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MLA
Christiaens, Annelies et al. “Suboptimal Light Conditions Influence Source-sink Metabolism During Flowering.” FRONTIERS IN PLANT SCIENCE 7 (2016): n. pag. Print.
APA
Christiaens, A., De Keyser, E., Pauwels, E., De Riek, J., Gobin, B., & Van Labeke, M.-C. (2016). Suboptimal light conditions influence source-sink metabolism during flowering. FRONTIERS IN PLANT SCIENCE, 7.
Chicago author-date
Christiaens, Annelies, Ellen De Keyser, Els Pauwels, Jan De Riek, Benny Gobin, and Marie-Christine Van Labeke. 2016. “Suboptimal Light Conditions Influence Source-sink Metabolism During Flowering.” Frontiers in Plant Science 7.
Chicago author-date (all authors)
Christiaens, Annelies, Ellen De Keyser, Els Pauwels, Jan De Riek, Benny Gobin, and Marie-Christine Van Labeke. 2016. “Suboptimal Light Conditions Influence Source-sink Metabolism During Flowering.” Frontiers in Plant Science 7.
Vancouver
1.
Christiaens A, De Keyser E, Pauwels E, De Riek J, Gobin B, Van Labeke M-C. Suboptimal light conditions influence source-sink metabolism during flowering. FRONTIERS IN PLANT SCIENCE. 2016;7.
IEEE
[1]
A. Christiaens, E. De Keyser, E. Pauwels, J. De Riek, B. Gobin, and M.-C. Van Labeke, “Suboptimal light conditions influence source-sink metabolism during flowering,” FRONTIERS IN PLANT SCIENCE, vol. 7, 2016.
@article{7222094,
  abstract     = {Reliance on carbohydrates during flower forcing was investigated in one early and one late flowering cultivar of azalea (Rhododendron simsii hybrids). Carbohydrate accumulation, invertase activity, and expression of a purported sucrose synthase gene (RsSUS) was monitored during flower forcing under suboptimal (natural) and optimal (supplemental light) light conditions, after a cold treatment (7 degrees C + dark) to break flower bud dormancy. Post-production sucrose metabolism and flowering quality was also assessed. Glucose and fructose concentrations and invertase activity increased in petals during flowering, while sucrose decreased. In suboptimal light conditions RsSUS expression in leaves increased as compared to optimal light conditions, indicating that plants in suboptimal light conditions have a strong demand for carbohydrates. However, carbohydrates in leaves were markedly lower in suboptimal light conditions compared to optimal light conditions. This resulted in poor flowering of plants in suboptimal light conditions. Post production flowering relied on the stored leaf carbon, which could be accumulated under optimal light conditions in the greenhouse. These results show that flower opening in azalea relies on carbohydrates imported from leaves and is source-limiting under suboptimal light conditions.},
  articleno    = {249},
  author       = {Christiaens, Annelies and De Keyser, Ellen and Pauwels, Els and De Riek, Jan and Gobin, Benny and Van Labeke, Marie-Christine},
  issn         = {1664-462X},
  journal      = {FRONTIERS IN PLANT SCIENCE},
  keywords     = {TOMATO FRUIT,source-sink,PETAL GROWTH,GENE,SENESCENCE,PLANTS,EXPRESSION,STALK ELONGATION,CELL-DIVISION,ROSA-HYBRIDA L.,SUCROSE SYNTHASE,flowering,azalea,Rhododendron simsii,supplemental light,sucrose synthase,invertase},
  language     = {eng},
  pages        = {11},
  title        = {Suboptimal light conditions influence source-sink metabolism during flowering},
  url          = {http://dx.doi.org/10.3389/fpls.2016.00249},
  volume       = {7},
  year         = {2016},
}

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