Abstract
GmNAC5 is a member of NAM subfamily belonging to NAC transcription factors in soybean (Glycine max (L.) Merr.). Studies on NAC transcription factors have shown that this family functioned in the regulation of shoot apical meristem (SAM), hormone signalling, and stress responses. In this study, we examined the expression levels of GmNAC5. GmNAC5 was highly expressed in the roots and immature seeds, especially strongly in immature seeds of 40 days after flowering. In addition, we found that GmNAC5 was induced by mechanical wounding, high salinity, and cold treatments but was not induced by abscisic acid (ABA). The subcellular localization assay suggested that GmNAC5 was targeted at nucleus. Together, it was suggested that GmNAC5 might be involved in seed development and abiotic stress responses in soybean.
Highlights
Environmental stresses such as drought, salinity, and cold are major factors that significantly limit agricultural productivity
It has been documented that the plant-specific NAC transcription factors play an important role in plant development and stress responses [27]
GmNAC5 belongs to the NAM subgroup and is most closely related to CUC1, CUC2, and NAM, which are involved in developmental events, maintenance of shoot meristem, and cotyledons separation [28]
Summary
Environmental stresses such as drought, salinity, and cold are major factors that significantly limit agricultural productivity. The C-terminal regions of NAC proteins, which exhibit the transactivation activity, are highly divergent in both sequence and length [2,3,4] This family of transcription factors is involved in a lot of plant developmental processes, including shoot apical meristem formation [5], hormone signaling [2, 6], regulation of cell division and cell expansion [7], control of secondary wall formation [8,9,10], and responses to various stresses [11,12,13,14]. In addition to the salt induction, AtNAC2 can be induced by abscisic acid (ABA), ACC, and NAA [21] These showed that the NAM subfamily members play a regulatory role in plant development and participate in stress responses. In order to further study the physiological and biochemical processes that GmNAC5 gene may be involved in, the soybean organ expression patterns of the gene and the relationship between GmNAC5 gene and abiotic stress were examined
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