Effects of rooting-zone restriction on the changes in carbohydrates and nitrogenous compounds in 'Kyoho' grapevines during winter dormancy and early shoot growth.

摘要

Changes in carbohydrates and nitrogenous compounds were investigated in Kyoho grapevines grown under restricted rooting conditions and in non-restricted conditions (control). There were no significant differences in levels of sugars, starch and total-N between the treated and control plants during winter dormancy. At bud-burst, vines with restricted roots contained more sugars in small roots, but lower N in the trunk and cane, compared with controls. Similar trends were observed in xylem sap collected from the trunk base at bud burst, young shoots disbudded 2 and 3 weeks after bud burst, and shoots and flower clusters at full flowering. Relationships between the nutritional status, retarded shoot growth, and improved berry set in vines grown underrestricted rooting treatments are discussed.