The NAC transcription factors SNAP1/2/3/4 are central regulators mediating high nitrogen responses in mature nodules of soybean

Xin Wang, Zhimin Qiu, Wenjun Zhu, Nan Wang, Mengyan Bai, Huaqin Kuang, Chenlin Cai, Xiangbin Zhong, Fanjiang Kong, Peitao Lü () and Yuefeng Guan ()
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Xin Wang: Guangzhou University
Zhimin Qiu: Fujian Agriculture and Forestry University
Wenjun Zhu: Fujian Agriculture and Forestry University
Nan Wang: Inner Mongolia University
Mengyan Bai: Fujian Agriculture and Forestry University
Huaqin Kuang: Guangzhou University
Chenlin Cai: Fujian Agriculture and Forestry University
Xiangbin Zhong: Fujian Agriculture and Forestry University
Fanjiang Kong: Guangzhou University
Peitao Lü: Fujian Agriculture and Forestry University
Yuefeng Guan: Guangzhou University

Nature Communications, 2023, vol. 14, issue 1, 1-13

Abstract: Abstract Legumes can utilize atmospheric nitrogen via symbiotic nitrogen fixation, but this process is inhibited by high soil inorganic nitrogen. So far, how high nitrogen inhibits N2 fixation in mature nodules is still poorly understood. Here we construct a co-expression network in soybean nodule and find that a dynamic and reversible transcriptional network underlies the high N inhibition of N2 fixation. Intriguingly, several NAC transcription factors (TFs), designated as Soybean Nitrogen Associated NAPs (SNAPs), are amongst the most connected hub TFs. The nodules of snap1/2/3/4 quadruple mutants show less sensitivity to the high nitrogen inhibition of nitrogenase activity and acceleration of senescence. Integrative analysis shows that these SNAP TFs largely influence the high nitrogen transcriptional response through direct regulation of a subnetwork of senescence-associated genes and transcriptional regulators. We propose that the SNAP-mediated transcriptional network may trigger nodule senescence in response to high nitrogen.

Date: 2023
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DOI: 10.1038/s41467-023-40392-w

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