Therefore leaves from trees with either dwarfing or low vigour rootstocks tend to have lower photosynthetic rates than those from more vigorous trees. In our study we have measured differences in the amount of starch and other carbohydrate reserves stored in plant organs. Preliminary results show that trees with trifoliata as a rootstock had higher starch reserves in the stem and branches but lower levels in the roots than-trees with Troyer rootstocks. These results must now be correlated to tree development and fruit production. Effects on tree size, precocity, fruit production and maturity are achieved through complex interrelationships between the roots and canopy of the plant.
Rootstocks directly affect the ability of plants to take up water and nutrients.
They are also able to significantly alter the pattern of canopy development and functions such as photosynthesis. In this study we have demonstrated that Troyer citrange significantly improved in tree vigour and yield as well as altering the development and nutrition of a Silverhill satsuma mandarin scion. This article suggests that Troyer citrange could prove an interesting stock for satsuma mandarins. New Zealand Ltd. All rights reserved. Reproduction in whole or in part in any form or medium without express written permission of The Horticulture and Food Research Institute of New Zealand Ltd is prohibited.