Effects of low nitrogen on seedling growth, photosynthetic characteristics and antioxidant system of rice varieties with different nitrogen efficiencies.

After low-nitrogen treatment, the ASA content of XN999 rice variety showed a decreasing trend with days.

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The MDA content in the leaves of rice varieties showed an increasing trend with the number of days of low nitrogen treatment (Fig. 3 c).

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Under the 1N treatment, the leaf \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\mathrm{O}}_{2}^{-}$$\end{document} O 2 - production rate was relatively stable, and under the 1/2N and 1/4N treatments, it showed a trend of first increasing and then decreasing.

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