Short-term evaluation of oxygen transfer from rice (Oryza sativa) to mixed planted drought-adapted upland crops under hydroponic culture
Short-term evaluation of oxygen transfer from rice (Oryza sativa) to mixed planted drought-adapted upland crops under hydroponic culture
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DOI：
10.1080/1343943x.2017.1379882
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发表时间：
2017-09
影响因子：
2.5
通讯作者：
M. Iijima;Y. Hirooka;Yoshimasa Kawato;Y. Watanabe;K. Wada;Nodoka Shinohara;Pamwenafye I. Nanhapo
中科院分区：
文献类型：
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作者：
M. Iijima;Y. Hirooka;Yoshimasa Kawato;Y. Watanabe;K. Wada;Nodoka Shinohara;Pamwenafye I. Nanhapo
摘要混作是热带地区广泛采用的一种栽培方法。新开发的紧密混合种植技术通过在田间洪水条件下种植水稻（Oryza sativa），减轻了适应干旱的旱地谷物品种的洪水胁迫。我们利用水培模式系统验证了水稻向旱地作物转移氧的假设。为了证实这一假设，在无土水培条件下，对植物对O2的吸收和释放现象进行了评价。在气候室中进行了实验，测定了富氧（20.0±。）条件下水稻和珍珠粟根系释放的O2量。0%浓缩的。在第一阶段)和无o2暗(。8±。0%浓缩的。在第二阶段)条件。单播水稻与珍珠粟的总O2变化（两个阶段之间）显著高于混播水稻与珍珠粟，说明水分栽培条件下，O2从水稻转移到珍珠粟。结果表明，两种植物之间的转移量约为7 μM O2 g鲜根重−1 h−1。在水中混合培养中，两种植物之间的氧传递得到了证实，这意味着它有助于改善旱地作物在田间洪涝条件下的生理状况。
Abstract Mixed cropping is a cultivation method widely practiced in tropical regions. The newly developed close mixed planting technique mitigates the flood stress of drought-adapted upland cereal species by co-growing rice (Oryza sativa) plants under field flood conditions. We tested the hypothesis that O2 was transferred from rice to upland crops using the model system of hydroponic culture. To confirm the hypothesis, the phenomena of O2 absorption and release by plants were evaluated in a water culture condition without soil. Experiments were conducted in a climate chamber to estimate the amount of O2 released from the roots of rice and pearl millet (Pennisetum glaucum) under both O2-rich (20.0 ± .0% conc. in phase I) and O2-free dark (.8 ± .0% conc. in phase II) conditions. The total O2 change (between the two phases) in a single planting of rice and pearl millet was significantly higher than that of the mixed planting of rice and pearl millet, which indicated that O2 was transferred from rice to pearl millet under a water culture condition. The result indicated that approximately 7 μM O2 g fresh root weight−1 h−1 was transferred between the two plant species. O2 transfer was confirmed between the two plant species in a mix cultured in water, implying its contribution to the phenomenon that improved the physiological status of drought-adapted upland crops under field flood conditions.