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The influence of diurnal temperature range on rate of leaf appearance, time of flowering and degree of fruit set – Inter and intra cultivar differences for Vitis vinifera L. : A dissertation submitted in partial fulfilment of the requirements for the Degree of Master of Wine and Viticulture at Lincoln University

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  • Title:
    The influence of diurnal temperature range on rate of leaf appearance, time of flowering and degree of fruit set – Inter and intra cultivar differences for Vitis vinifera L. : A dissertation submitted in partial fulfilment of the requirements for the Degree of Master of Wine and Viticulture at Lincoln University
  • Author: Mattern, Tucker Herman
  • Subjects: ANZSRC::05 Environmental Sciences ; ANZSRC::050204 Environmental Impact Assessment ; ANZSRC::06 Biological Sciences ; ANZSRC::0607 Plant Biology ; ANZSRC::07 Agricultural and Veterinary Sciences ; ANZSRC::0706 Horticultural Production ; diurnal temperature range (DTR) ; flowering ; fruit set ; grapevine ; grapevine phenology ; phenology ; Vitis vinifera ; Vitis vinifera L
  • Description: Temperature is recognized as a primary influence on grapevine phenology and has been used to classify the climates and regions suited for growing specific grapevine varieties. Many models utilize average temperature to correlate with phenological stages and predict the timing of specific phases. Because average temperature does not account for the hourly temperature or the change in temperature from day to night, it is not known to what degree diurnal temperature range (DTR) influences grapevine phenophases. Utilizing controlled growth conditions (phytotrons) the objective was to determine if DTR impacted the rate of leaf appearance, time of flowering or percent fruit set separate from average temperature (Experiment 1); and to determine if thermal time measured as growing degree hours (GDHs) impacted the rate of leaf appearance, time of flowering and or the degree of fruit set (Experiment 2). For Experiment 1, the time of flowering occurred 3.5 (P<0.05) days earlier when vines were exposed to a larger DTR opposed to a smaller DTR. The rate of leaf appearance and percent fruit set was not significantly affected by DTR. Varietal differences for rate of leaf appearance were observed within treatments as well as between treatments in response to DTR. Clonal differences were seen in response to DTR and within treatments. For Experiment 2, differences in the time of flowering were observed for treatments with the same GDHs. It was not possible to determine if differences were driven by average temperature, DTR or if it was a combined effect. This study highlights DTR as a delineable measurement responsible for influencing key phenological stages of the grapevine and emphasises the importance of measuring DTR when using heat summation approximation for phenological modelling or simulating growth conditions for phenology experiments.
  • Publisher: Lincoln University
  • Creation Date: 2020
  • Language: English
  • Source: Lincoln University Research Archive
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