12 J.-H.B.Hatier,K.S.Gould (Bowler and Fluhr 2000).Despite its efficier roplasts,mitoc ria,and pero somes, may ere stress (Yamasak et a ole typically occupy more than 70%of the mature plant cell volume, and as a s of all the majo anthocyanins are likely to have a crucial role,especially in preventing the symplastic movement of ROS from one cell to another(Mittler et al.2004). Finally,anthocyanins may interact with secondary messengers downstream of the ROS signalling pathway,or else be involved in the crosstalk with other response pathways.An intriguing possibility is the interaction between anthocyanins and sucrose.The anthocyanin biosynthetic pathway is strongly upregulated by sucrose in plants as diverse as radish (Raphanus sativus)English ivy (Hedera helix).and Arabidopsis thaliana (Murray and Hackett 1991;Hara et al.2003;Solfanelli et al. 2006).Soluble sugars,especially sucrose,glucose,and fructose,are now known to play central roles in the control of plant development.stress responses.and gene expression (Gibson 2005).Sugar accumulation has been associated with improved tolerance to diverse stressors including drought,salinity,high light,cold,anoxia and herbicides(Roitsch 1999:Couee et al.2006).It has been sugg sted that these roles relate to the regulation of the pro-oxidant and antioxidant balance in plant cells sucrose is known to be involved in both ROS-producing and ROS-scavenging metabolic However,the mechanism by which established A sinalline role for anthocvanins is attractive hecause it potentially also explains why anthocyanins often accumulate in c tosynthesise,or else for photosynthetic carbon assimilation is not the prim such as stem petioles and adventitious roots It can also explain why anthoc species ntially produced at certain developr ental stag s such as seed leaf i or leat h Establish g po sible relatio ellula sents the e of an ex new line investigat o this plant pigments References Adir,N.,Zer,H,Scholat,S.and Ohad,1.(2003)Photoinhibition-a historical perspective. p63 and Tattini,M.(2007)Chloroplast-located flavonoids car 4770 Alenius CM and 995)A three-dimensional representation of the relationship between penetration of U.V.-B radiation and U.V.-screening pigments in leaves o ica napu w Phytol.131,297-302 nA.C.and Alscher.R.G..Donahue. and Cr C.L(1997)Reactive oxygen species and antioxidants:relationships in green cells.Physiol.Plant.100,224-233
12 J.-H. B. Hatier, K.S. Gould (Bowler and Fluhr 2000). Despite its efficient scavenging by enzymes in the chloroplasts, mitochondria, and peroxisomes, H2O2 may leak into the cytosol and possibly the vacuole during periods of severe stress (Yamasaki et al. 1997). Vacuoles typically occupy more than 70% of the mature plant cell volume, and as a consequence of their size, vacuoles are one of the closest neighbours of all the major sources of organelle-derived ROS. For this reason, vacuolar LMWAs such as the anthocyanins are likely to have a crucial role, especially in preventing the symplastic movement of ROS from one cell to another (Mittler et al. 2004). Finally, anthocyanins may interact with secondary messengers downstream of the ROS signalling pathway, or else be involved in the crosstalk with other response pathways. An intriguing possibility is the interaction between anthocyanins and sucrose. The anthocyanin biosynthetic pathway is strongly upregulated by sucrose in plants as diverse as radish (Raphanus sativus), English ivy (Hedera helix), and Arabidopsis thaliana (Murray and Hackett 1991; Hara et al. 2003; Solfanelli et al. 2006). Soluble sugars, especially sucrose, glucose, and fructose, are now known to play central roles in the control of plant development, stress responses, and gene expression (Gibson 2005). Sugar accumulation has been associated with improved tolerance to diverse stressors including drought, salinity, high light, cold, anoxia and herbicides (Roitsch 1999; Couée et al. 2006). It has been suggested that these roles relate to the regulation of the pro-oxidant and antioxidant balance in plant cells; sucrose is known to be involved in both ROS-producing and ROS-scavenging metabolic pathways (Couée et al. 2006). However, the mechanism by which sucrose, anthocyanins, and ROS might contribute to plant function remains to be established. A signalling role for anthocyanins is attractive because it potentially also explains why anthocyanins often accumulate in organs that do not photosynthesise, or else for which photosynthetic carbon assimilation is not the primary function, such as stems petioles, and adventitious roots. It can also explain why anthocyanins are in some species preferentially produced at certain developmental stages, such as seed dormancy, leaf initiation or leaf senescence, or in certain seasons such as autumn or spring. Establishing possible relationships between the cellular redox balance and anthocyanin function presents the promise of an exciting, new line of investigation into this intriguing class of plant pigments. References Photosynth. Res. 76, 343–370. Agati, G., Matteini, P., Goti, A. and Tattini, M. (2007) Chloroplast-located flavonoids can scavenge singlet oxygen. New Phytol. 174, 77–89. Ålenius, C.M., Vogelmann, T.C. and Bornman, J.F. (1995) A three-dimensional representation of the relationship between penetration of U.V.-B radiation and U.V.-screening pigments in leaves of Brassica napus. New Phytol. 131, 297–302. Allan, A.C. and Fluhr, R. (1997) Two distinct sources of elicited reactive oxygen species in tobacco epidermal cells. Plant Cell 9, 1559–1572. Alscher, R.G., Donahue, J.L. and Cramer, C.L. (1997) Reactive oxygen species and antioxidants: relationships in green cells. Physiol. Plant. 100, 224–233. Adir, N., Zer, H., Scholat, S. and Ohad, I. (2003) Photoinhibition – a historical perspective
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