文献类型：期刊文献

英文题名：Tobacco plants expressing the maize nitrate transporter ZmNrt2.1 exhibit altered responses of growth and gene expression to nitrate and calcium

作者：Ibrahim, Abubakar[1,2];Jin, Xiao-Lu[1];Zhang, Yu-Bin[1,3];Cruz, Jessica[1];Vichyavichien, Paveena[1];Esiobu, Nwadiuto[1];Zhang, Xing-Hai[1]

机构：[1]Florida Atlantic Univ, Dept Biol Sci, Boca Raton, FL 33431 USA;[2]Modibbo Adama Univ Technol, Dept Soil Sci, Yola, Nigeria;[3]Guangdong Ocean Univ, Monitoring Ctr Marine Resources & Environm, Zhanjiang 524088, Peoples R China

年份：2017

卷号：58

期号：1

外文期刊名：BOTANICAL STUDIES

收录：SCI-EXPANDED(收录号：WOS:000415377600004)、、Scopus(收录号：2-s2.0-85035145370)、WOS

基金：This work was supported in part by a fund from Modibbo Adama University of Technology, Nigeria, and Florida Atlantic University, USA.

语种：英文

外文关键词：Calcium signaling; Nitrate sensing; Nitrate responsive genes; Potassium; Tobacco; Maize high-affinity nitrate transporter ZmNrt2.1

外文摘要：Background: Nitrate uptake is a highly regulated process. Understanding the intricate interactions between nitrate availability and genetically-controlled nitrate acquisition and metabolism is essential for improving nitrogen use efficiency and increasing nitrate uptake capacity for plants grown in both nitrate-poor and nitrate-enriched environments. In this report, we introduced into tobacco (Nicotiana tabacum) the constitutively expressed maize high-affinity transporter ZmNrt2.1 gene that would bypass the tight control for the endogenous nitrate-responsive genes. By using calcium inhibitors and varying levels of NO3-, Ca2+ and K+, we probed how the host plants were affected in their nitrate response.& para;& para;Results: We found that the ZmNrt2.1-expressing plants had better root growth than the wild type plants when Ca2+ was deficient regardless of the nitrate levels. The growth restriction associated with Ca2+-deficiency can be alleviated with a high level of K+. Furthermore, the transgenic plants exhibited altered expression patterns of several endogenous, nitrate-responsive genes, including the high- and low-affinity nitrate transporters, the Bric-a-Brac/Tramtrack/Broad protein BT2 and the transcription factor TGA-binding protein TGA1, in responding to treatments of NO3-, K+ or inhibitors for the calcium channel and the cytosolic Ca2+-regulating phospholipase C, as compared to the wild type plants under the same treatments. Their expression was not only responsive to nitrate, but also affected by Ca2+. There were also different patterns of gene expression between roots and shoots.& para;& para;Conclusion: Our results demonstrate the ectopic effect of the maize nitrate transporter on the host plant's overall gene expression of nitrate sensing system, and further highlight the involvement of calcium in nitrate sensing in tobacco plants.