Articles
LATE SEASON LEAF GAS EXCHANGE OF THREE YOUNG CHERRY CULTIVARS GROWING ON FIVE ROOTSTOCKS
Article number
636_19
Pages
159 – 165
Language
English
Abstract
Two three-year-old cherry trees of each of the sweet cherry cultivars Burlat, Van and Summit on the rootstocks Edabriz, Gisela 5, Maxma 14, Cab 11E and Prunus avium were selected to establish a randomized complete block design.
The objective was to evaluate the rootstock and cultivar effects on plant leaf gas exchanges near the end of the growing season (September 4th), to get better acquainted on the causes of dwarfing effects of low-vigour rootstocks.
The Summit cultivar had the highest net CO2 assimilation, stomatal conductance and transpiration rate, but its intrinsic water use efficiency was lower than that of the others.
As for the rootstocks, two distinct groups could be identified (Pav-Mxm-Cab and Gsl-Edb), the first one being the most active.
The interactions Bur*Pav and Sum*Pav were the most active in the first week of September, and the lowest CO2 assimilation rates were observed on the Van cultivar when growing on the dwarfing rootstocks, Gisela 5 and Edabriz. This fact allows the inference that invigorating rootstocks could keep scion growth active for longer periods, lengthening the photosynthetically active season and individual shoot growth.
This could be a consequence of a delayed arrival of the flux of hormonal compounds to the canopy, that determine the entrance into dormancy and leaf senescence and fall.
The objective was to evaluate the rootstock and cultivar effects on plant leaf gas exchanges near the end of the growing season (September 4th), to get better acquainted on the causes of dwarfing effects of low-vigour rootstocks.
The Summit cultivar had the highest net CO2 assimilation, stomatal conductance and transpiration rate, but its intrinsic water use efficiency was lower than that of the others.
As for the rootstocks, two distinct groups could be identified (Pav-Mxm-Cab and Gsl-Edb), the first one being the most active.
The interactions Bur*Pav and Sum*Pav were the most active in the first week of September, and the lowest CO2 assimilation rates were observed on the Van cultivar when growing on the dwarfing rootstocks, Gisela 5 and Edabriz. This fact allows the inference that invigorating rootstocks could keep scion growth active for longer periods, lengthening the photosynthetically active season and individual shoot growth.
This could be a consequence of a delayed arrival of the flux of hormonal compounds to the canopy, that determine the entrance into dormancy and leaf senescence and fall.
Authors
A. Santos, J.M. Moutinho-Pereira
Keywords
Prunus avium, CO2 assimilation, stomatal conductance, transpiration rate, growth control, dwarfing
Online Articles (89)