The Nitrate Transporter (NRT) Gene Family in Poplar

Bai, Hua; Euring, Dejuan; Volmer, Katharina; Janz, Dennis; Polle, Andrea

doi:10.1371/journal.pone.0072126

Cited by 97 publications

(97 citation statements)

References 83 publications

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“…In addition to nitrate remobilization specific transporters, NRT1.6 and NRT1.7 were found to be involved innitrate remobilization and seed development in some plants (Arabidopsis, Brachypodium, poplar and rice) but absent in others (maize, sorghum, grape and cucumber) [305] [433]. Absence of these transporters in some plants indicates that they represent species specific functional specialization.…”

Section: Evolution Of Nitrogen Metabolism Genesmentioning

confidence: 99%

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Nitrogen Nutrition, Its Regulation and Biotechnological Approaches to Improve Crop Productivity

Reddy¹,

Ulaganathan²

2015

AJPS

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Nitrogen is the most important macronutrient needed for plant growth and development. The availability of nitrogen in the soil fluctuates greatly in both time and space. Crop plants, except leguminous plants, depend on supply of nitrogen as fertilizers. Large quantities of nitrogen fertilizers are applied to crop plants, but only 33% of it is utilized by the plant. Plants have developed efficient mechanisms to sense the varying levels of nitrogen forms and uptake them. They also have well developed mechanisms to assimilate the incoming nitrogen immediately or translocate to different parts of the plant wherever it is needed. Maintenance of nitrogen homeostasis is essential to avoid toxicity. Apart from translocation and assimilation, plants have developed different mechanisms, nitrogen efflux; vacuolar nitrogen storage and downward transport of nitrogen from aerial parts to roots, for maintaining nitrogen homeostasis. In crop plants the "grain yield per unit of available nitrogen in the soil" is referred as the nitrogen use efficiency (NUE) for which remobilization of nitrogen, mediated by various transporters plays a crucial role. All these processes are tightly regulated by proteins and microRNA in response to both external and internal nitrogen levels, carbon status of the plant and hormones. As most crop plants are non-leguminous and depend on soil nitrogen, more production could be achieved if crop plants can be made to utilize the available nitrogen efficiently. The recent explosion of research information and the mechanisms behind nitrogen sensing, signaling, transport and utilization enables biotechnological interventions for better nitrogen nutrition of crop plants. This review discusses such possibilities in the context of recent understanding of nitrogen nutrition and the genomic revolution sweeping the crop science.

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Section: Evolution Of Nitrogen Metabolism Genesmentioning

confidence: 99%

“…Cucumber also contains NRT1.9 and NRT1.10 genes. Poplar contains 4 genes coding for NRT1.9 transporter [433]. As there is no information regarding the presence of these transporters in other plants, probably these transporters represent Arabidopsis specific functional specialization.…”

Section: Evolution Of Nitrogen Metabolism Genesmentioning

confidence: 99%

Nitrogen Nutrition, Its Regulation and Biotechnological Approaches to Improve Crop Productivity

Reddy¹,

Ulaganathan²

2015

AJPS

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“…Nitrate transporters are generally important in plants, as nitrate is the main nitrogen source required for synthesis of nucleic and amino acids. Therefore, a regulation of nitrate distribution is crucial to modulate growth (biomass acquisition) in response to temperature or light conditions ( [61,62]). Interestingly, there are only two poplar representatives within a phylogenetic sub-clade of NRT2 that is populated by as many as five Arabidopsis sequences (ATNRT2.1/2.2/2.3/2.4/2.6).…”

Section: Polygenic and Pleiotropic Adaptation Relating To Climatementioning

confidence: 99%

“…Interestingly, there are only two poplar representatives within a phylogenetic sub-clade of NRT2 that is populated by as many as five Arabidopsis sequences (ATNRT2.1/2.2/2.3/2.4/2.6). This implies that a deletion event occurred in this clade whose functional significance remains elusive to date [62]. Phylogenetic reconstruction coupled with gene expression analysis point at neo/subfunctionalisation of the two poplar nitrate transporters for long distance nitrate transport from roots, wood to leaves [62].…”

Section: Polygenic and Pleiotropic Adaptation Relating To Climatementioning

confidence: 99%

“…Fig 1); Note: POPTR_0143s00200 was recently re-annotated to Potri.009G008500 and both genes are now assembled on chromosome 9 within 50kb of each other (new poplar genome assembly Phytozyme v3). Both sequences are now described as tandem gene pair PTNRT2.4A (alias Potri.009G008600) and PTNRT2.4B (alias Potri.009G008500) with 97% DNA sequence similarity [62]. (PDF) S1 Table. Comprehensive population differentiation estimates and h 2 corrected P ST for P.…”

Section: Marker-trait Association Mappingmentioning

confidence: 99%

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Evolutionary quantitative genomics ofPopulus trichocarpa

Porth

Klápště

McKown

et al. 2015

Preprint

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Forest trees generally show high levels of local adaptation and efforts focusing on understanding adaptation to climate will be crucial for species survival and management. Here, we address fundamental questions regarding the molecular basis of adaptation in undomesticated forest tree populations to past climatic environments by employing an integrative quantitative genetics and landscape genomics approach. Using this comprehensive approach, we studied the molecular basis of climate adaptation in 433 Populus trichocarpa (black cottonwood) genotypes originating across western North America. Variation in 74 field-assessed traits (growth, ecophysiology, phenology, leaf stomata, wood, and disease resistance) was investigated for signatures of selection (comparing Q ST -F ST ) using clustering of individuals by climate of origin (temperature and precipitation). 29,354 SNPs were investigated employing three different outlier detection methods and marker-inferred relatedness was estimated to obtain the narrow-sense estimate of population differentiation in wild populations. In addition, we compared our results with previously assessed selection of candidate SNPs using the 25 topographical units (drainages) across the P. trichocarpa sampling range as population groupings. Narrow-sense Q ST for 53% of distinct field traits was significantly divergent from expectations of neutrality (indicating adaptive trait variation); 2,855 SNPs showed signals of diversifying selection and of these, 118 SNPs (within 81 genes) were associated with adaptive traits (based on significant Q ST ). Many SNPs were putatively pleiotropic for functionally uncorrelated adaptive traits, such as autumn phenology, height, and disease resistance. Evolutionary quantitative genomics in P. trichocarpa provides an enhanced understanding regarding the molecular basis of climate-driven selection in forest trees and we highlight that important loci underlying adaptive trait variation also show relationship to climate of origin. We consider our approach the most comprehensive, PLOS ONE |

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