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Position: Home > Articles > The mitigation effects of exogenous dopamine on low nitrogen stress in Malus hupehensis Journal of Integrative Agriculture 2020,19 (11)

The mitigation effects of exogenous dopamine on low nitrogen stress in Malus hupehensis

作者：

Liu Xiao-min;Gao Teng-teng;Zhang Zhi-jun;Tan Ke-xin;Jin Yi-bo;Zhao Yong-juan;Ma Feng-wang;Li Chao

单位：

Northwest A&F Univ, State Key Lab Crop Stress Biol Arid Areas, Minist Sci & Technol, Shaanxi Key Lab Apple, Yangling 712100, Shaanxi, Peoples R China

关键词：

nitrogen deficiency;dopamine;root system architecture;ethylene;Malus hupehensis

摘要：

Dopamine plays numerous physiological roles in plants. We explored its role in the regulation of growth, nutrient absorption, and response to nitrogen (N) deficiency in Malus hupehensis Rehd. Under low N condition, plant growth slowed, and the net photosynthetic rates, chlorophyll contents, and maximal quantum yield of PSII (F-v/F-m) decreased significantly. However, the application of 100 mu mol L-1 exogenous dopamine significantly reduced the inhibition of low N stress on plant growth. In addition to modifying root system architecture under low N supply, exogenous dopamine also changed the uptake, transport, and distribution of N, P, and K. Furthermore, exogenous dopamine enhances the tolerance to low nitrogen stress by increasing the activity of enzymes (nitrate reductase, nitrite reductase, glutamic acid synthase and glutamine synthetase) involved in N metabolism. We also found that exogenous dopamine promoted the expression of ethylene signaling genes (ERF1, ERF2, EIL1, ERS2, ETR1, and EIN4) under low N stress. Therefore, we hypothesized that ethylene might be involved in dopamine response to low N stress in M. hupehensis. Our results suggest that exogenous dopamine can mitigate low N stress by regulating the absorption of mineral nutrients, possibly through the regulation of the ethylene signaling pathway.

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The mitigation effects of exogenous dopamine on low nitrogen stress in Malus hupehensis

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