Sugar repression of photosynthesis: the role of carbohydrates in signalling nitrogen deficiency through source:sink imbalance

azote azucares carbohidratos carbohydrates deficiencia de minerales enzimas enzyme enzymes glucide mineral deficiencies mineral nutrients nicotiana tabacum nitrogen nutrientes minerales photosynthese photosynthesis relaciones fuente sumidero relation source puits ribulose-bisphosphate carboxylase rubisco source sink relations sucres sugars tabac tabaco tobacco