Legume Research

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Research Article

Legume Research, volume 42 issue 5 (october 2019) : 603-608

Overexpression of the StP5CS gene promotes nodulation and nitrogen fixation in vegetable soybean under drought stress

X.X. Wang, F. Gao, S.P. Yang, J.Y. Gai, Y.L. Zhu
1National Center for Soybean Improvement, Nanjing Agricultural University, Nanjing 210 095, China.

  • Submitted08-04-2019|

  • Accepted11-08-2019|

  • First Online 04-10-2019|

  • doi 10.18805/LR-490

Cite article:- Wang X.X., Gao F., Yang S.P., Gai J.Y., Zhu Y.L. (2019). Overexpression of the StP5CS gene promotes nodulation and nitrogen fixation in vegetable soybean under drought stress. Legume Research. 42(5): 603-608. doi: 10.18805/LR-490.

ABSTRACT

The StP5CS (GenBank accession number: JN606861) T6 homozygous transgenic lines (HTLs) of vegetable soybean [Glycine max (L.) Merrill] were grown using vermiculite pot culture to determine whether StP5CS overexpression would enhance nodulation and symbiotic nitrogen fixation (SNF) in two T6 HTLs (17W-1, 17W-2) under drought conditions. The growth performance, nodule development and seed weight of T6 HTLs were significantly better than those of wild type (WT) plants. The proline levels in various tissues of T6 HTLs were higher than WT plants. The concentrations of total ureide, total N, leghemoglobin (Lb) and the activity of glutamine synthetase (GS, EC 6.3.1.2) in the T6 HTLs were significantly increased. Moreover, the relative expression levels of five key nodulation- and SNF-associated genes (i.e., GmENOD40-1, GmENOD40-2, GmLba, GmGS1â1 and GmGS1â2) were significantly higher in T6 HTLs. In conclusion, overexpression of StP5CS enhances nodulation and SNF in transgenic vegetable soybean under drought stress conditions.

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