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Article

Source of Oxygen Fed to Adventitious Roots of Syzygium kunstleri (King) Bahadur and R.C. Gaur Grown in Hypoxic Conditions

1
Urban Forests Research Center, National Institute of Forest Science, Seoul 02455, Korea
2
Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan
*
Author to whom correspondence should be addressed.
Plants 2020, 9(11), 1433; https://doi.org/10.3390/plants9111433
Received: 7 October 2020 / Revised: 21 October 2020 / Accepted: 22 October 2020 / Published: 24 October 2020
(This article belongs to the Special Issue Plant Acclimatization to Abiotic Stress)
Syzygium kunstleri, a woody plant species, adapts to hypoxic conditions by developing new adventitious roots. Here, we investigate its morphological adaptation to long-term water level changes and the sources and pathways of O2 supplied to its adventitious roots. Cuttings were cultivated in hydroponic and agar media, and then, the water level was increased by 6 cm following adventitious root emergence; afterward, O2 partial pressure changes were measured using a Clark-type O2 microelectrode. O2 concentrations in the adventitious roots decreased when N2 was injected, regardless of the presence of light, indicating that the O2 source was not photosynthetic when bark was removed. New adventitious roots developed near the surface when the water level increased, and O2 conditions above the raised water level influenced O2 concentrations in adventitious roots. O2 concentrations in adventitious roots that developed before the water level increased were lower than in the newly developed adventitious roots but increased when the O2 concentrations above the original water level increased. Our study highlights morphological changes, such as the development of adventitious roots, as environmental adaptation mechanisms. By revealing O2 sources in S. kunstleri under hypoxic environments, we offer insights into the challenges of long-term adaptation to changing environments in woody plants. View Full-Text
Keywords: adventitious roots; hypoxic conditions; oxygen transportation; water level elevation; woody plants; Syzygium kunstleri adventitious roots; hypoxic conditions; oxygen transportation; water level elevation; woody plants; Syzygium kunstleri
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MDPI and ACS Style

Sou, H.-D.; Masumori, M.; Ezaki, G.; Tange, T. Source of Oxygen Fed to Adventitious Roots of Syzygium kunstleri (King) Bahadur and R.C. Gaur Grown in Hypoxic Conditions. Plants 2020, 9, 1433. https://doi.org/10.3390/plants9111433

AMA Style

Sou H-D, Masumori M, Ezaki G, Tange T. Source of Oxygen Fed to Adventitious Roots of Syzygium kunstleri (King) Bahadur and R.C. Gaur Grown in Hypoxic Conditions. Plants. 2020; 9(11):1433. https://doi.org/10.3390/plants9111433

Chicago/Turabian Style

Sou, Hong-Duck, Masaya Masumori, Goro Ezaki, and Takeshi Tange. 2020. "Source of Oxygen Fed to Adventitious Roots of Syzygium kunstleri (King) Bahadur and R.C. Gaur Grown in Hypoxic Conditions" Plants 9, no. 11: 1433. https://doi.org/10.3390/plants9111433

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