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Plant function and evolutionary biology
RESEARCH ARTICLE

Nitrate increases ethylene production and aerenchyma formation in roots of lowland rice plants under water stress

Cuimin Gao A B * , Lei Ding A * , Yingrui Li A , Yupei Chen A , Jingwen Zhu A , Mian Gu A , Yong Li C , Guohua Xu A , Qirong Shen A and Shiwei Guo A D
+ Author Affiliations
- Author Affiliations

A College of Resources and Environmental Sciences, Nanjing Agricultural University, National Engineering Research Center for Organic-based Fertilizers, Nanjing 210095, China.

B Institute of Plant Nutrition, Agricultural Resources and Environmental Sciences, Henan Academy of Agricultural Sciences, Zhengzhou 450002, China.

C Crop Physiology and Production Center, Huazhong Agricultural University, Wuhan, Hubei 430070, China.

D Corresponding author. Email: sguo@njau.edu.cn

Functional Plant Biology 44(4) 430-442 https://doi.org/10.1071/FP16258
Submitted: 7 January 2016  Accepted: 9 December 2016   Published: 31 January 2017

Abstract

Ethylene increases root cortical aerenchyma formation in maize (Zea mays L.), rice (Oryza sativa L.) and other species. To further investigate the effects of nitrate, ammonium and water stress on ethylene production and aerenchyma formation in roots, two lowland rice cultivars (Shanyou 63, hybrid indica, and Yangdao 6, inbred indica) were cultured hydroponically with 10% (w/v) polyethylene glycol to simulate water stress. Water stress decreased shoot biomass, stomatal conductivity and leaf water potential in cultivars fed with nitrate but not with ammonium. Water stress induced more aerenchyma formation in cultivars fed with nitrate rather than ammonium, and increased cortical aerenchyma was found in Yangdao 6. Endogenous ethylene production by roots increased significantly under water stress in plants fed with nitrate rather than ammonium. Exogenous ethylene stimulated root cortical aerenchyma formation. Expression of the ethylene biosynthesis gene 1-aminocyclo-propane-1-carboxylic acid (ACC) synthase (ACS5) was greater in roots fed with nitrate rather than ammonium in the presence and absence of water stress. The expression of ethylene signalling pathway genes involved in programmed cell death (lesion-simulating disease (L.S.D.)1.1 and L.S.D.2; enhanced disease susceptibility (EDS) and phytoalexin-deficient (PAD4)) were regulated by the N form and water stress. In plants of cultivars fed with ammonium, L.S.D.1.1 expression increased under water stress, whereas L.S.D.2, EDS and PAD4 expression decreased. In conclusion, nitrate increases ethylene production and cortical aerenchyma formation in roots of water-stressed lowland rice. However, ammonium increased L.S.D.1.1 expression in water-stressed roots, and decreased ACS5, EDS and PAD4 expression, which would inhibit ethylene production and aerenchyma formation.

Additional keywords: ethylene signalling pathway genes, gene expression, nitrogen form, Oryza sativa.


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