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Hokkaido Univarsity (2014)

Effect of varietal difference in root system on soil water absorption, root hydraulic conductance and drought tolerance in potato crop

Tetsuhisa Deguchi

Titre : Effect of varietal difference in root system on soil water absorption, root hydraulic conductance and drought tolerance in potato crop

Auteur : Tetsuhisa Deguchi

Université de soutenance : Hokkaido Univarsity

Grade : Doctoral Thesis 2014

Présentation
The objective of this study is to contribute on enhancement of drought tolerance of potato crop by improving water uptake ability of root system. This study was conducted (1) to clarify the contribution of root system on varietal difference in soil water absorption, (2) to clarify the contribution of varietal difference in root system on hydraulic conductance, and (3) to evaluate the effects of both soil water absorption and hydraulic conductance on yield performance under droughted fields. In Chapter 1, TR ratio (Root DW / Total DW) and deep rooting ability of Konyu varieties and their response to environmental factors including water and climate conditions were analyzed. In Chapter 2, varietal difference of soil water absorption in droughted field was evaluated and its relationship to root system was analyzed. In Chapter 3, effect of root system on hydraulic conductance was evaluated. In Chapter 4, yield performance of Konyu varieties and Konafubuki in irrigated and droughted field over 4 years was compared and discussed the contribution of superior root system on yield performance in droughted field. In Chapter 5, since Konyu-2 showed superior yield potential not only in droughted field but also droughted field, analysis was conducted to clarify the factor related to superior performance of Konyu-2 from perspective of DW partition and aboveground morphological characteristics..

Présentation

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Page publiée le 15 octobre 2016, mise à jour le 19 avril 2020