Articles
DORMANT CARBOHYDRATE RESERVES OF TWO PEACH CULTIVARS GRAFTED ON DIFFERENT VIGOR ROOTSTOCKS
Article number
903_113
Pages
815 – 820
Language
English
Abstract
In temperate fruit trees, early spring shoot growth depends on carbohydrate reserves accumulated in the previous season.
Vigorous rootstocks can accumulate more reserves, which contribute to a higher initial flush of shoot growth.
Total dormant, non-structural carbohydrates (TNC) in above and below ground tissues were studied in mature 4-year-old Redhaven and 5-year-old Redtop peach trees at three different locations (California, Georgia and South Carolina), and in 1-year-old Redhaven trees grown near Clemson, South Carolina.
The rootstocks included Lovell (Prunus persica), Pumiselect® (P. pumila), Krymsk® 1 (P. tomentosa × P. cerasifera), Cadaman®-Avimag (P. persica × P. davidiana), Controller® 5 (P. salicina × P. persica) and Cornerstone (P. persica × P. dulcis). Shoot and root samples were taken for tissue analysis from the mature trees concurrently when the 1-year-old peach trees were removed from the ground.
Carbohydrates were also quantified in bark and wood tissues in the mature Redtop trees.
Greater concentrations of TNC were found in roots of Redhaven and Redtop trees in California compared to the other two sites; however, shoot TNC did not differ significantly among sites.
Concentration of TNC in roots was at least two-fold more than in shoots.
Lovell roots had the greatest accumulation of reserves and Krymsk® 1 the lowest.
Rootstock bark accumulated the largest amount of TNC, followed by scion bark, and Lovell had the greatest TNC content.
One-year-old Redhaven trees had the highest TNC accumulation in Lovell roots.
About 70% of TNC were accumulated in root tissues, and smaller roots accounted for most of the carbohydrates (>80%). The more vigorous rootstocks, in this case Lovell, not only had the greatest accumulation of dormant carbohydrates, but also had the greatest root and shoot dry weights per tree, suggesting that the initial differences in spring shoot growth could be attributed to both.
Vigorous rootstocks can accumulate more reserves, which contribute to a higher initial flush of shoot growth.
Total dormant, non-structural carbohydrates (TNC) in above and below ground tissues were studied in mature 4-year-old Redhaven and 5-year-old Redtop peach trees at three different locations (California, Georgia and South Carolina), and in 1-year-old Redhaven trees grown near Clemson, South Carolina.
The rootstocks included Lovell (Prunus persica), Pumiselect® (P. pumila), Krymsk® 1 (P. tomentosa × P. cerasifera), Cadaman®-Avimag (P. persica × P. davidiana), Controller® 5 (P. salicina × P. persica) and Cornerstone (P. persica × P. dulcis). Shoot and root samples were taken for tissue analysis from the mature trees concurrently when the 1-year-old peach trees were removed from the ground.
Carbohydrates were also quantified in bark and wood tissues in the mature Redtop trees.
Greater concentrations of TNC were found in roots of Redhaven and Redtop trees in California compared to the other two sites; however, shoot TNC did not differ significantly among sites.
Concentration of TNC in roots was at least two-fold more than in shoots.
Lovell roots had the greatest accumulation of reserves and Krymsk® 1 the lowest.
Rootstock bark accumulated the largest amount of TNC, followed by scion bark, and Lovell had the greatest TNC content.
One-year-old Redhaven trees had the highest TNC accumulation in Lovell roots.
About 70% of TNC were accumulated in root tissues, and smaller roots accounted for most of the carbohydrates (>80%). The more vigorous rootstocks, in this case Lovell, not only had the greatest accumulation of dormant carbohydrates, but also had the greatest root and shoot dry weights per tree, suggesting that the initial differences in spring shoot growth could be attributed to both.
Publication
Authors
A.M. Weibel, G.L. Reighard, N.C. Rajapakse, T.M. DeJong
Keywords
Prunus persica, vegetative growth, dwarfing
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