Investigating the relationship between reserve nitrogen and carbohydrates on initial grapevine growth and development and the role of root derived cytokinins

Stewart Keith Field

Research output: ThesisDoctoral Thesis

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Abstract

The predominant cytokinin forms in the xylem sap were highly correlated with shoot growth rates conforming with the general conclusion that cytokinins control shoot growth. However, no correlations occurred between cytokinin in the xylem sap and carbohydrate or nitrogen reserves in the root or wood. By contrast, Shiraz vines exposed to a root-zone temperature of 23°C (Chapter 3) had higher bleeding sap cytokinin delivery rates and also greater shoot biomass at the time of flowering compared to vines exposed to 13°C from increased mobilisation of root starch reserves. Furthermore, in Chapters 4 and 5, vines with high starch concentrations at budbreak had higher cytokinin concentrations within the bleeding sap than vines with low starch concentrations. These results conform with this conclusion suggesting that CK loading into the sap at budbreak signals the carbohydrate level or the carbohydrate mobilisation potential of the perennial tissue to the developing shoots.
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
  • Charles Sturt University
Supervisors/Advisors
  • Holzapfel, Bruno, Principal Supervisor
  • Smith, Jason, Principal Supervisor
  • Greer, Dennis, Principal Supervisor
Award date31 Aug 2013
Place of PublicationAustralia
Publisher
Publication statusPublished - 2013

Fingerprint

sap
cytokinins
growth and development
vines
carbohydrates
nitrogen
shoots
budbreak
starch
xylem
root zone temperature
flowering
biomass

Cite this

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title = "Investigating the relationship between reserve nitrogen and carbohydrates on initial grapevine growth and development and the role of root derived cytokinins",
abstract = "The predominant cytokinin forms in the xylem sap were highly correlated with shoot growth rates conforming with the general conclusion that cytokinins control shoot growth. However, no correlations occurred between cytokinin in the xylem sap and carbohydrate or nitrogen reserves in the root or wood. By contrast, Shiraz vines exposed to a root-zone temperature of 23{\^A}°C (Chapter 3) had higher bleeding sap cytokinin delivery rates and also greater shoot biomass at the time of flowering compared to vines exposed to 13{\^A}°C from increased mobilisation of root starch reserves. Furthermore, in Chapters 4 and 5, vines with high starch concentrations at budbreak had higher cytokinin concentrations within the bleeding sap than vines with low starch concentrations. These results conform with this conclusion suggesting that CK loading into the sap at budbreak signals the carbohydrate level or the carbohydrate mobilisation potential of the perennial tissue to the developing shoots.",
author = "{Keith Field}, Stewart",
year = "2013",
language = "English",
publisher = "Charles Sturt University",
address = "Australia",
school = "Charles Sturt University",

}

Investigating the relationship between reserve nitrogen and carbohydrates on initial grapevine growth and development and the role of root derived cytokinins. / Keith Field, Stewart.

Australia : Charles Sturt University, 2013. 222 p.

Research output: ThesisDoctoral Thesis

TY - THES

T1 - Investigating the relationship between reserve nitrogen and carbohydrates on initial grapevine growth and development and the role of root derived cytokinins

AU - Keith Field, Stewart

PY - 2013

Y1 - 2013

N2 - The predominant cytokinin forms in the xylem sap were highly correlated with shoot growth rates conforming with the general conclusion that cytokinins control shoot growth. However, no correlations occurred between cytokinin in the xylem sap and carbohydrate or nitrogen reserves in the root or wood. By contrast, Shiraz vines exposed to a root-zone temperature of 23°C (Chapter 3) had higher bleeding sap cytokinin delivery rates and also greater shoot biomass at the time of flowering compared to vines exposed to 13°C from increased mobilisation of root starch reserves. Furthermore, in Chapters 4 and 5, vines with high starch concentrations at budbreak had higher cytokinin concentrations within the bleeding sap than vines with low starch concentrations. These results conform with this conclusion suggesting that CK loading into the sap at budbreak signals the carbohydrate level or the carbohydrate mobilisation potential of the perennial tissue to the developing shoots.

AB - The predominant cytokinin forms in the xylem sap were highly correlated with shoot growth rates conforming with the general conclusion that cytokinins control shoot growth. However, no correlations occurred between cytokinin in the xylem sap and carbohydrate or nitrogen reserves in the root or wood. By contrast, Shiraz vines exposed to a root-zone temperature of 23°C (Chapter 3) had higher bleeding sap cytokinin delivery rates and also greater shoot biomass at the time of flowering compared to vines exposed to 13°C from increased mobilisation of root starch reserves. Furthermore, in Chapters 4 and 5, vines with high starch concentrations at budbreak had higher cytokinin concentrations within the bleeding sap than vines with low starch concentrations. These results conform with this conclusion suggesting that CK loading into the sap at budbreak signals the carbohydrate level or the carbohydrate mobilisation potential of the perennial tissue to the developing shoots.

M3 - Doctoral Thesis

PB - Charles Sturt University

CY - Australia

ER -