Leaf arginine spraying improves leaf gas exchange under water deficit and root antioxidant responses during the recovery period.

摘要: Abstract Arginine (Arg) metabolism is associated with many cellular and developmental processes in plants proline, nitric oxide (NO) polyamines (PAs) have a wide range of physiological functions plants, including increased tolerance to environmental stresses. This study aimed test the hypothesis that Arg spraying would stimulate synthesis NO PAs, reducing oxidative damage caused by water deficit (WD) increasing drought sugarcane plants. Sugarcane were sprayed or 1 mM, subjected WD gradual addition polyethylene glycol (PEG-8000) nutrient solution. As references, grown solution without PEG-8000 not Arg. Our data indicate exogenous supply improved leaf gas exchange during enhanced root antioxidative protection recovery period. prevented proline accumulation induced then main pathway for likely through glutamate instead arginine. Although substrate PAs production, supplying had only slight effects both levels. The amino acids capable harmful drought, such as Arg, can be an alternative improve crop growth under field conditions.