02034naa a2200289 a 450000100080000000500110000800800410001902400380006010000160009824500960011426000090021030000170021950000490023652011910028565000110147665300180148765300160150565300210152165300220154265300140156465300170157865300150159565300130161070000170162370000140164077300900165410126932018-12-07       2012    bl uuuu     u00u1 u    #d7 a10.1007/978-94-007-4171-3_212DOI1 aGRAVINA, A.  aNutrient-hormone interactions in citrusbphysiological implications.h[electronic resource]  c2012  app. 303-320.  aChapter history: First Online 23 April 2012.  aABSTRACT. Citrus growth and development is regulated by complex but subtly tuned nutritional and hormonal interaction in response to environmental signalling. Flower induction is stimulated by low temperatures and water stress and mediated by previous fruit load, being endogenous gibberellins (GAs) content pointed as the main inhibiting hormones. The promoting role of carbohydrates or nitrogen (N) on fl owering has not been demonstrated, but a minimum content of these compounds seems to be required for fl ower formation. Fruit set is a critical step for fruit production, being initially regulated by GAs content. Thereafter, during the onset of the source-sink competition, fruit set depends upon carbohydrates and N availability and fruitlets sink strength. During stage II of fruit development, fruit growth is promoted by auxins, carbohydrates and water accumulation. Afterwards, peel colour development, which is stimulated by low temperatures, is promoted by the decline of  fl avedo?s GAs content and the steady-state level of ethylene, as carbohydrates and abscisic acid (ABA) increase and N decrease during this fi nal stage.  © Springer Science+Business Media B.V. 2012  aCITRUS  aCARBOHYDRATES  aCOMPETITION  aFLOWER INDUCTION  aFRUIT DEVELOPMENT  aFRUIT SET  aGIBBERELLINS  aMATURATION  aNITROGEN1 aGAMBETTA, G.1 aRIVAS, F.  tIn: Srivastava A. (eds) Advances in Citrus Nutrition. Springer, Dordrecht. (Chap. 21)