Phosphate Deprivation in Maize: Genetics and Genomics

Calderón‐Vázquez, Carlos L.; Sawers, Ruairidh J. H.; Herrera-Estrella, Luis

doi:10.1104/pp.111.174987

Cited by 83 publications

(74 citation statements)

References 129 publications

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“…QTLs for root exudates were reported by Yan et al (2004) [acid (H ? ) exudation] and Cálderon-Vázquez et al (Calderón-Vázquez et al 2011). QTLs for leaf area and chlorophyll content in maize at the silking stage were assessed by Cai et al (2012).…”

Section: Genetic Factors: Qtlsmentioning

confidence: 99%

Improving phosphorus use efficiency in agriculture: opportunities for breeding

Wiel¹,

Linden²,

Scholten³

2015

Euphytica

195

115

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Phosphorus (P) is often an important limiting factor for crop yields, but rock phosphate as fertilizer is a non-renewable resource and expected to become scarce in the future. High P input levels in agriculture have led to environmental problems. One of the ways to tackle these issues simultaneously is improving phosphorus use efficiency (PUE) of the crops through breeding. In this review, we describe plant architectural and physiological traits important for PUE. Subsequently, we discuss efficient methods of screening for PUE traits. We address targeted cultivation methods, including solid and hydroponic systems, as well as testing methods, such as image analysis systems, and biomass and photosynthesis measurements. Genetic variation for PUE traits has been assessed in many crops, and genetics of PUE has been studied by quantitative trait loci (QTL) analyses and genome-wide association study. A number of genes involved in the plant's response to low P have been characterized. These genes include transcription factors, and genes involved in signal transduction, hormonal pathways, sugar signalling, P saving metabolic pathways, and in P scavenging, including transporters and metabolites and/or ATP-ases mobilizing P in the soil. In addition, the role of microorganisms promoting PUE of plants, particularly arbuscular mycorrhizal fungi is discussed. An overview is given of methods for selecting for optimal combinations of plant and fungal genotypes, and their genetics, incl. QTLs and genes involved. In conclusion, significant progress has been made in selecting for traits for PUE, developing systems for the difficult but highly relevant root phenotyping, and in identifying QTLs and genes involved.

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Section: Genetic Factors: Qtlsmentioning

confidence: 99%

Improving phosphorus use efficiency in agriculture: opportunities for breeding

Wiel¹,

Linden²,

Scholten³

2015

Euphytica

195

115

View full text Add to dashboard Cite

show abstract

“…We found that the putative GRMZM2G165734 gene is actually a MIR399 homolog. We identified more possible target sites in genomic DNA located immediately upstream of GRMZM2G381709, an ortholog of Arabidopsis PHO2 (Calderón-Vázquez et al, 2011). Arabidopsis PHO2 encodes an ubiquitinconjugating E2 enzyme that plays a role in the maintenance of Pi homeostasis (Bari et al, 2006).…”

Section: Analysis Of Mirnas and Their Targetsmentioning

confidence: 99%

Genome-Wide Characterization of Maize Small RNA Loci and Their Regulation in the required to maintain repression6-1 (rmr6-1) Mutant and Long-Term Abiotic Stresses

et al. 2016

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(A.L., M.J.A.) Endogenous small RNAs (sRNAs) contribute to gene regulation and genome homeostasis, but their activities and functions are incompletely known. The maize genome has a high number of transposable elements (TEs; almost 85%), some of which spawn abundant sRNAs. We performed sRNA and total RNA sequencing from control and abiotically stressed B73 wild-type plants and rmr6-1 mutants. RMR6 encodes the largest subunit of the RNA polymerase IV complex and is responsible for accumulation of most 24-nucleotide (nt) small interfering RNAs (siRNAs). We identified novel MIRNA loci and verified miR399 target conservation in maize. RMR6-dependent 23-24 nt siRNA loci were specifically enriched in the upstream region of the most highly expressed genes. Most genes misregulated in rmr6-1 did not show a significant correlation with loss of flanking siRNAs, but we identified one gene supporting existing models of direct gene regulation by TE-derived siRNAs. Long-term drought correlated with changes of miRNA and sRNA accumulation, in particular inducing down-regulation of a set of sRNA loci in the wild-typeleaf.

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“…Calderón-Vázquez et al (2011) recently published a list of Pi regulators in maize, and the majority of those regulators are strongly down-regulated in the N-deficient maize leaves (Table V). This could indicate that a large part of transcripts down-regulated in the experiment were secondary responses reacting toward the increased phosphate level.…”

Section: Effects Of N Deficiency On Pi Metabolismmentioning

confidence: 99%

Maize Source Leaf Adaptation to Nitrogen Deficiency Affects Not Only Nitrogen and Carbon Metabolism But Also Control of Phosphate Homeostasis

et al. 2012

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Crop plant development is strongly dependent on the availability of nitrogen (N) in the soil and the efficiency of N utilization for biomass production and yield. However, knowledge about molecular responses to N deprivation derives mainly from the study of model species. In this article, the metabolic adaptation of source leaves to low N was analyzed in maize (Zea mays) seedlings by parallel measurements of transcriptome and metabolome profiling. Inbred lines A188 and B73 were cultivated under sufficient (15 mM) or limiting (0.15 mM) nitrate supply for up to 30 d. Limited availability of N caused strong shifts in the metabolite profile of leaves. The transcriptome was less affected by the N stress but showed strong genotype-and age-dependent patterns. N starvation initiated the selective down-regulation of processes involved in nitrate reduction and amino acid assimilation; ammonium assimilation-related transcripts, on the other hand, were not influenced. Carbon assimilation-related transcripts were characterized by high transcriptional coordination and general down-regulation under low-N conditions. N deprivation caused a slight accumulation of starch but also directed increased amounts of carbohydrates into the cell wall and secondary metabolites. The decrease in N availability also resulted in accumulation of phosphate and strong down-regulation of genes usually involved in phosphate starvation response, underlining the great importance of phosphate homeostasis control under stress conditions.

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Phosphate Deprivation in Maize: Genetics and Genomics

Cited by 83 publications

References 129 publications

Improving phosphorus use efficiency in agriculture: opportunities for breeding

Improving phosphorus use efficiency in agriculture: opportunities for breeding

Genome-Wide Characterization of Maize Small RNA Loci and Their Regulation in the required to maintain repression6-1 (rmr6-1) Mutant and Long-Term Abiotic Stresses

Maize Source Leaf Adaptation to Nitrogen Deficiency Affects Not Only Nitrogen and Carbon Metabolism But Also Control of Phosphate Homeostasis

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