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- Title
Relationship between hydraulic conductance and citrus dwarfing by the Flying Dragon rootstock ( Poncirus trifoliata L. Raft var. monstruosa).
- Authors
Martínez-Alcántara, B.; Rodriguez-Gamir, J.; Martínez-Cuenca, M.; Iglesias, D.; Primo-Millo, E.; Forner-Giner, M.
- Abstract
This work studied the hydraulic characteristics and physiological behavior of two trifoliate orange ( Poncirus trifoliata L. Raft) varieties-Flying Dragon (FD) and Rubidoux (RT)-with contrasting size-controlling potential when used as rootstocks for citrus trees. Thus, Valencia orange scions growing on RT root system develop about 40 % more biomass than scions on FD. The anatomical study of xylem root tissue of both rootstocks showed that the number of vessels per cross-sectional area in RT almost doubled that found in FD, whereas diameter distribution did not vary significantly. Hydraulic resistance determined in rootstocks, and bud union segments were, respectively, 2- and 3.4-fold higher in trees on FD than in trees on RT. Root systems accounted for 46.5 and 55.2 % of whole-plant hydraulic resistance, whereas bud union segments represented 7.5 and 14.6 % of this parameter, the dwarfing rootstock (FD) having the highest values. Reduced hydraulic conductance in plants on FD rootstock diminished water potential in high evaporative demand periods, causing a reduction in stomatal conductance with respect to plants on RT. This leads to lower net photosynthetic CO assimilation, which may affect biomass production. Translocation of C-labeled photoassimilates from leaves to roots was lower in plants on FD than in plants on RT, indicating that in the dwarfing rootstock (FD) there may be a vascular resistance to sucrose transport at the budding union level. Findings show that reduced hydraulic conductance may be the main cause of rootstock-induced dwarfing in citrus grafted onto FD.
- Subjects
HYDRAULIC conductivity; ROOTSTOCKS; BIOMASS; CITRUS; PLANT roots
- Publication
Trees: Structure & Function, 2013, Vol 27, Issue 3, p629
- ISSN
0931-1890
- Publication type
Article
- DOI
10.1007/s00468-012-0817-1