Free amino acids in the xylem sap of pear trees during dormancy

Abstract

ABSTRACT

Impact of chilling requirements on metabolic changes in nitrogenous compounds in buds during and after dormancy releasing in early and late (Malus sylvestris, Mill) apple varieties

“…The release of buds from dormancy and the resumption of growth have been accredited to mechanisms regulating changes in metabolic activity and amino acids. 24 In addition, Wang and Faust 29 on apple found that arginine levels increased during March and April reaching the maximum at the end of April. From the onset of May, they decreased gradually until they reached a steady level at the end of July and beginning of August.…”

“…25 Moreover, Kuroi 47 indicated that N (including amino acids) was present at low levels in buds or roots during the dormant stage, and reached a maximum level just prior to bud break. In this connection, Marafon et al 29 reported that storage and remobilization are considered key processes for the effective use of nitrogen in temperate fruit trees. As dormancy begins, storage proteins are synthesized, coinciding with a reduction in the levels of free amino acids.…”

“…23 The contents of nitrogen modification among the bud dormancy inflicting and emotional processes was studied by many researchers. [24][25][26][27][28][29][30][31] They found that the incidence, termination, regulation and management of dormancy were regulated by seasonal changing in nitrogenous compound. Some vary of studies are done on the modification of nitrogenous compounds from dormancy begin to bud break, but none on the relation between bud break and dynamic modification of nitrogenous compounds, likewise as a result of the equilibrium of early-opening apple varieties.…”

Influencia de variables climáticas en el contenido de N en Carya illinoensis Koch

“…Pyrus pyrifolia (Marafon et al, 2016(Marafon et al, , 1137, sin embargo, la mayoría de los trabajos se han realizado en condiciones controladas (Millard y Grelet, 2010, 1083.…”

“…: 207 -223 -210 -caída de las hojas y se movilizan en primavera (Bazot , 1024 Gilson et al, 2014, 117; Rennenberg et al, 2010, 276).Los estudios realizados sobre las reservas de N se han llevado a cabo en plantas herbáceas anuales (Valenzuela-Núñez et al, 2010, 76), mientras las investigaciones en especies leñosas son escasas, resaltando Populus spp. (Cooke y Weih, 2005, 20), Hevea brasilensis (Tian et al, 1998, 153), Swietenia macrophylla (Tian et al, 2003, 492), Picea sitchensis (Proe y Millard, 1994, 76),Prunus avium (Millard et al, 2006, 528), Quercus robur (Valenzuela-Núñez et al, 2011, 142) yPyrus pyrifolia (Marafon et al, 2016(Marafon et al, , 1137, sin embargo, la mayoría de los trabajos se han realizado en condiciones controladas (Millard y Grelet, 2010, 1083.Los estudios que abordan el almacenamiento de compuestos nitrogenados en el tallo (El Zein et al, 2011, 1391 y la movilización de nutrientes hacia los tejidos de nuevo crecimiento son escasos (Villar-Salvador et al, 2015, 819). En múltiples ocasiones los elementos nutritivos satisfacen la demanda de las plantas, ya sea por factores ambientales o por su disponibilidad en el medio ambiente (Millard y Grelet, 2010, 1091).…”