Abstract
Acid rain caused a severe loss on agricultural productivity, aggravating the challenge for achieving sustainable food production to feed the increasing globe population. To clarify the mechanism on adaptation of rice root to acid rain, we studied the root morphology and growth regulated by nutrient absorption under hydroponic conditions. Our results show that acid rain (pH 5.0 or 3.5) increased the density of root hair and root volume by increasing concentrations of K+, Na+, and Ca2+ in rice roots, and the root dry weight was increased. However, strong acid rain (pH 2.5) decreased the root length, surface area, volume, and number of root tips by decreasing the concentrations of K+, Na+, and Mg2+ in rice root, and fresh and dry weight were both decreased. After a 5-day recovery, the root morphology of rice seedlings treated with acid rain (pH 5.0 or 3.5) was recovered to the control levels, and the concentrations of K+, Na+, Ca2+, and Mg2+ also had no difference from the control (p < 0.05). However, the root growth treated with strong acid rain (pH 2.5) was still lower than the control because the inhibition on root activity and hydrolytic activity of plasma membrane H+-ATPase might have exceeded the self-regulating capacity of rice seedlings, and the absorption of mineral nutrient could not sustain the growth. Hence, we concluded that the adaption of root morphology of rice seedlings to acid rain was related to regulation of mineral nutrient absorption in rice root.
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The authors are grateful for the financial support from the Natural Science Foundation of Jiangsu Province (No.BK20161131) and the National Natural Science Foundation of China (31000245, 31370517).
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Zhang, B., Bu, J. & Liang, C. Root Morphology and Growth Regulated by Mineral Nutrient Absorption in Rice Roots Exposed to Simulated Acid Rain. Water Air Soil Pollut 227, 457 (2016). https://doi.org/10.1007/s11270-016-3151-1
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DOI: https://doi.org/10.1007/s11270-016-3151-1