Regulation of photosynthesis through source: sink imbalance in citrus is mediated by carbohydrate content in leaves
By D. Iglesias, Ignacio Lliso, F. Tadeo, Manuel Talón. 2002
297 citations recorded by the source corpus.
In citrus, the occurrence of a sink effect on photosynthesis (A) is controversial. Leaf carbohydrates and photosynthetic rates in field-grown trees of Satsuma mandarin (Citrus unshiu [Mak.] Marc.) cv. Okitsu, were measured to elucidate whether or not the demand for photoassimilates regulates A. The data indicated that the source-sink imbalances induced by different treatments altered both soluble (sucrose, glucose and fructose) and insoluble carbohydrates in leaves, as well as photosynthetic rates. In general, girdling and defruiting increased starch and reduced photosynthesis, whereas source-limiting conditions imposed through partial defoliations had the opposite effect. These results are compatible with the assumption that a lack of sink activity leads to carbohydrate accumulation and feedback inhibition of A, and vice versa. Further evidence supporting a source-sink effect on A was provided by measurements of the dry matter:leaf area ratio, since defoliations, for example, increased this ratio The in vivo sucrose supplementation to plants with different source:sink ratios (control, defoliated, girdled and defruited plants) increased carbohydrates and reduced photosynthesis. This suggests that sugars may have, per se, the potential to repress photosynthetic rates in intact plants with active sinks. Based on these results we propose that sugar accumulation in citrus leaves causes a feedback inhibition of A.
Subfields: Global and Planetary Change, Plant Science
View Paper: https://www.semanticscholar.org/paper/f26967fdd20248185a01caa5b8e45db4d274e66e
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Citations in the corpus
- Effects of nitrogen deficiency on leaf photosynthesis, carbohydrate status and biomass production in two olive cultivars 'Meski' and 'Koroneiki' (2010, background): “Previous work on citrus has shown that girdling and defruiting may increase carbohydrates, particularly starch, and decrease photosynthesis (Iglesias et al., 2002).”
- Carbohydrate Depletion in Roots and Leaves of Salt-Stressed Potted Citrus clementina L. (2005, background): “prismatic leaf chamber (see Iglesias et al. 2002 ).”
- Carbon allocation in fruit trees: from theory to modelling (2008, background): “Similarly, a decrease in photosynthesis with low fruit loads has been observed for different tree species (Gucci et al. 1995; Chalmers et al. 1975; BenMimoun et al. 1996; Franck et al. 2006; Iglesias et al. 2002; Syvertsen et al. 2003).”
- Are the rates of photosynthesis stimulated by the carbon sink strength of rhizobial and arbuscular mycorrhizal symbioses (2009, background): “…because of both carbohydrate accumulation in the leaf and end-product inhibition feedback in the Calvin Cycle (Lawn and Brun, 1974; Mondal et al., 1978; AzcónBieto, 1983; Goldschmidt and Huber, 1992; Iglesias et al., 2002; Rychter and Rao, 2005; McCormick et al., 2006; Dingkuhn et al., 2007).”
- Physiology of citrus fruiting (2007, background): “…example, it is known that ringing that generally increases fruit set and carbon availability (Iglesias et al., 2006b) probably because of the transitory block of phloem flux transport (Wallerstein et al., 1978; Yamanishi, 1995) also represses total photosynthetic activity (Iglesias et al., 2002).”
- Some aspects of citrus ecophysiology in subtropical climates: re-visiting photosynthesis under natural conditions (2007, background): “…has indirectly indicated that this inhibitory mechanism occurs in citrus leaves, as observed using girdled branches (Goldschmidt and Huber, 1992; Iglesias et al., 2002), de-fruited trees (Iglesias et al., 2002; Syvertsen et al., 2003), shoot removal (Syvertsen, 1994; Iglesias et al., 2002) and…”
- Molecular physiology of development and quality of citrus (2008, background): “requirements during fruit set increases photosynthetic rate (Iglesias et al., 2002; Rivas et al., 2007).”
- Carbohydrate and ethylene levels related to fruitlet drop through abscission zone A in citrus (2006, methodology): “This amount has been proved to have physiological significance (see Abdin et al. 1998; Iglesias et al. 2002).”