Chinese Journal OF Rice Science >
Effects of Rhizosphere Oxygen Concentration on Nutrient Uptake and Root Morphology of Rice at Tillering Stage
*Corresponding author：E-mail:weixinghua@caas.cn
Received date: 2014-12-22
Revised date: 2015-05-13
Online published: 2015-11-10
A hydroponic experiment was conducted to study the effects of rhizosphere oxygen concentration on rice seedling biomass, nutrient absorption and accumulation, and root morphology with Xiushui 09 and Chunyou 84 as material. With an online dissolved oxygen meter, four dissolved oxygen ( DOTs ) levels were set including low oxygen concentration(DOT 0 to 1.0 mg/L), medium oxygen concentration(DOT 2.5 to 3.5 mg/L), high oxygen concentration( DOT >6 mg/L, continuous bubbling with atmospheric air) and control (conventional hydroponics, without oxygen regulation). The results showed that compared with the control, the root, shoot and total dry weights increased by 30.30%, 32.96% and 32.46% for Xiushui 09 and by 7.01%, 1.77% and 9.17% for Chunyou 84, respectively under the medium oxygen concentration; under high oxygen contentration, the root, shoot and total dry weights decreased by 35.35%, 15.62% and 17.76% for Xiushui 09 and by 43.95%, 18.92% and 21.34% for Chunyou 84, respectively. The root to shoot ratios increased under low oxygen treatment. The total absorption and accumulation of N, P, K, Mn, Mg and Ca increased under the medium oxygen treatment, and the total absorption and accumulation of Fe, Cu and Zn increased under the low oxygen treatment. The root tip numbers, length and surface area, the proportion of fine roots also increased and the coarse root decreased under the medium oxygen treatment. Under the medium oxygen treatment, the proportion of fine roots increased, which contributes to nutrient uptake. This might be one of the main reasons for the increase in some element concentrations. The biomass, nutrient concentration, and accumulation, and root morphology obviously varied with cultivar.
Key words： rhizosphere oxygen concentration; rice; cultivar; nutrient element; root morphology
Chun-mei XU, Tao XIE, Dan-ying WANG, Song CHEN, Cheng-lin JI, Xiu-fu ZHANG, Qing-hua SHI . Effects of Rhizosphere Oxygen Concentration on Nutrient Uptake and Root Morphology of Rice at Tillering Stage[J]. Chinese Journal OF Rice Science, 2015 , 29(6) : 619 -627 . DOI: 10.3969/j.issn.1001G7216.2015.06.008
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