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Advantages linked to root development enhance rice biomass accumulation under elevated carbon dioxide conditions
Author(s) -
He Jiang,
Zhang Weiyang,
Zhu Kuanyu,
Wang Zhiqin,
Wang Weilu,
Yang Jianchang
Publication year - 2020
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.1002/agj2.20357
Subject(s) - dry matter , oryza sativa , carbon dioxide , biomass (ecology) , cultivar , zoology , chemistry , agronomy , horticulture , biology , biochemistry , organic chemistry , gene
To explore the effects of an increased CO 2 concentration on the growth and N absorption and utilization of different rice ( Oryza sativa L.) cultivars, the Liangyoupeijiu (LY) and Nanjing 9108 (NJ) rice cultivars were grown under ambient CO 2 (400 μmol mol −1 ) and elevated CO 2 (600 μmol mol −1 ) combined with high N (2.5 mM) and low N (0.5 mM) treatments. The effects of elevated CO 2 on root morphological and physiological characteristics, N uptake and utilization, and dry matter accumulation and distribution were analyzed. The results showed that the elevated CO 2 levels significantly increased the total biomass of LY under different N levels but only significantly increased the total biomass of NJ under high N. Elevated CO 2 significantly increased the N concentrations in the organs of LY but had no significant effect on the N concentrations in the organs of NJ. As a result, elevated CO 2 significantly increased the N accumulation of LY but decreased the N uptake of NJ under low N. Under elevated CO 2 conditions, the total root length and root surface area of LY increased, and the roots also maintained high activity. The larger roots and higher physiological activity and N accumulation of LY were the important reasons for the high levels of dry matter production in response to elevated CO 2 . Improvements in the root morphology and physiological activity of rice in future breeding efforts should enhance the dry matter production of low‐response rice.