Enhanced Nitric Oxide Synthesis Through Nitrate Supply Improves Drought Tolerance of Sugarcane Plants

Frontiers in Plant Science
Maria D PissolatoRafael V Ribeiro

Abstract

Nitric oxide (NO) is an important signaling molecule associated with many biochemical and physiological processes in plants under stressful conditions. Nitrate reductase (NR) not only mediates the reduction of NO3- to NO2- but also reduces NO2- to NO, a relevant pathway for NO production in higher plants. Herein, we hypothesized that sugarcane plants supplied with more NO3- as a source of N would produce more NO under water deficit. Such NO would reduce oxidative damage and favor photosynthetic metabolism and growth under water limiting conditions. Sugarcane plants were grown in nutrient solution and received the same amount of nitrogen, with varying nitrate:ammonium ratios (100:0 and 70:30). Plants were then grown under well-watered or water deficit conditions. Under water deficit, plants exhibited higher root [NO3-] and [NO2-] when supplied with 100% NO3-. Accordingly, the same plants also showed higher root NR activity and root NO production. We also found higher photosynthetic rates and stomatal conductance in plants supplied with more NO3-, which was associated with increased root growth. ROS accumulation was reduced due to increases in the activity of catalase in leaves and superoxide dismutase and ascorbate peroxidase in...Continue Reading

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Citations

Mar 7, 2021·Plants·Su-Ee LauBoon Chin Tan
Mar 14, 2021·Plant Physiology and Biochemistry : PPB·Neidiquele M SilveiraEduardo C Machado
Jul 17, 2021·Journal of Experimental Botany·Cristina R G SalesJohannes Kromdijk

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Methods Mentioned

BETA
MDA
electrophoresis

Software Mentioned

ImageJ
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