REAL

Effect of ozone stress on the absorption, distribution, and utilization of nitrogen in rice under different planting densities

Peng, B. and Li, P. and Lai, S. and Wang, Y. and Yang, L. and Wang, Y. (2019) Effect of ozone stress on the absorption, distribution, and utilization of nitrogen in rice under different planting densities. Cereal Research Communications, 47 (1). pp. 182-190. ISSN 0133-3720

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Abstract

High ozone (O<sub>3</sub>) can cause great damage to plants. However, the effect of high O<sub>3</sub> on nitrogen (N) absorption, distribution, and utilization in rice at different growth stages under different planting densities is poorly understood. In the present study, a conventional cultivar (Yangdao 6) and a hybrid cultivar (II You 084) with different planting densities were exposed to an elevated amount of O<sub>3</sub> (E-O<sub>3</sub>; 50% higher than that of the control, C-O<sub>3</sub>) under a freeair gas concentration enrichment (FACE) system. N absorption, distribution, and utilization of the green leaves, stems, and shoots at tillering, jointing heading, and maturity were investigated. Results showed that E-O<sub>3</sub> significantly increased the N content in the shoots of Yangdao 6 by 7.5%, 12.7%, and 19.6%, respectively, at jointing, heading, and maturity. Also, the N content in the shoots of II You 084 increased by 5.4%, 6.5%, and 8.4% at the corresponding growth stage upon E-O<sub>3</sub> application. E-O<sub>3</sub> significantly decreased N accumulation of II You 084 by 8.3%, 4.9%, 4.7%, and 19.2%, respectively, at tillering, jointing, heading, and maturity. Further, E-O<sub>3</sub> had a decreasing effect on the N distribution in green leaves (p ≤ 0.05) of both cultivars, but exerted an increasing effect on that in the stems of both cultivars (p ≤ 0.05). In addition, E-O<sub>3</sub> significantly decreased the N use efficiency (NUE) for biomass of the two cultivars in all growth stages. These results revealed that E-O<sub>3</sub> could increase the N content in rice plants but decrease the N accumulation and utilization in both cultivars. The effects of E-O<sub>3</sub> on N absorption, distribution, and utilization were not affected by planting density.

Item Type: Article
Subjects: S Agriculture / mezőgazdaság > S1 Agriculture (General) / mezőgazdaság általában
Depositing User: Ágnes Sallai
Date Deposited: 19 Jul 2019 07:57
Last Modified: 19 Jul 2019 07:57
URI: http://real.mtak.hu/id/eprint/94494

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