Molecular Breeding for Phosphorus‐efficient Rice

Heuer, Sigrid; Chin, Joong Hyoun; Gamuyao, Rico; Haefele, Stephan M.; Wissuwa, Matthias

doi:10.1002/9781118728482.ch5

Cited by 5 publications

(3 citation statements)

References 73 publications

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“…This may help in reducing P fertilizer requirement of crops, while helping to prevent environmental degradation [ 9 ] due to excess applied P, as well as in reducing anti-nutritional factors such as Phytate accumulation in grains that reduces the bioavailability of mineral elements such as Ca 2+ , Mg 2+ , Zn 2+ , Fe 2+ , Cu 2+ and Mn 2+ [ 10 ]. This can be achieved by improving the genetic potential of crop varieties to grow under P minimal conditions [ 11 , 12 ], as well as to reduce grain phytate content [ 13 – 15 ].…”

Section: Introductionmentioning

confidence: 99%

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Identification of putative QTLs for seedling stage phosphorus starvation response in finger millet (Eleusine coracana L. Gaertn.) by association mapping and cross species synteny analysis

Ramakrishnan¹,

Ceasar

Vinod

et al. 2017

PLoS ONE

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A germplasm assembly of 128 finger millet genotypes from 18 countries was evaluated for seedling-stage phosphorus (P) responses by growing them in P sufficient (Psuf) and P deficient (Pdef) treatments. Majority of the genotypes showed adaptive responses to low P condition. Based on phenotype behaviour using the best linear unbiased predictors for each trait, genotypes were classified into, P responsive, low P tolerant and P non-responsive types. Based on the overall phenotype performance under Pdef, 10 genotypes were identified as low P tolerants. The low P tolerant genotypes were characterised by increased shoot and root length and increased root hair induction with longer root hairs under Pdef, than under Psuf. Association mapping of P response traits using mixed linear models revealed four quantitative trait loci (QTLs). Two QTLs (qLRDW.1 and qLRDW.2) for low P response affecting root dry weight explained over 10% phenotypic variation. In silico synteny analysis across grass genomes for these QTLs identified putative candidate genes such as Ser-Thr kinase and transcription factors such as WRKY and basic helix-loop-helix (bHLH). The QTLs for response under Psuf were mapped for traits such as shoot dry weight (qHSDW.1) and root length (qHRL.1). Putative associations of these QTLs over the syntenous regions on the grass genomes revealed proximity to cytochrome P450, phosphate transporter and pectin methylesterase inhibitor (PMEI) genes. This is the first report of the extent of phenotypic variability for P response in finger millet genotypes during seedling-stage, along with the QTLs and putative candidate genes associated with P starvation tolerance.

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Section: Introductionmentioning

confidence: 99%

“…Although Pup1 does impart P starvation tolerance, it does not hold any P homeostasis related genes, implying that P homeostatic pathways are not the regulators for P starvation tolerance. Perhaps the external signals that drive the root system development do play a significant role in boosting P uptake from P limited soils [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Identification of putative QTLs for seedling stage phosphorus starvation response in finger millet (Eleusine coracana L. Gaertn.) by association mapping and cross species synteny analysis

Ramakrishnan¹,

Ceasar

Vinod

et al. 2017

PLoS ONE

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“…This deeper rooting appears to be due to the DRO1 protein interacting with auxin distribution in the root tip, increasing root gravitropism. Heuer and coworkers identified a gene, phosphorus starvation tolerance 1 ( PSTOL1 ), in rice that increased root system size during early root growth to better “mine” Pi from the soil (Gamuyao et al., 2012; Heuer et al., 2013). The mechanism by which the PSTOL1 protein alters RSA to increase total root length and surface area is not known, but it could involve altered partitioning of photosynthate and metabolic energy between the root and shoot or between different parts of the root system.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of variation in seedling root architectural traits and their potential association with nitrogen fixation and agronomic traits in field pea accessions

Dhillon,

Chandnani,

Nakhforoosh

et al. 2024

Crop Science

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Root system architecture (RSA) plays a central role in water and nutrient acquisition in plants. Plasticity and genetic variation in RSA can be used as an adaptive strategy to optimize plant performance under variable environments. We quantified phenotypic variation for seedling RSA among 44 diverse pea (Pisum sativum L.) genotypes, including breeding lines and germplasm accessions, grown under controlled conditions for 14 days using two‐dimensional hydroponic root imaging. Root image analysis revealed significant genotypic variability among the lines for all root traits, namely root length (RL), root diameter (RD), root volume, root surface area, number of tips, network width (NW), network depth (ND), and network convex area. Significant positive correlations were observed among the evaluated root traits, ranging from 0.5 to 0.9. Pea lines were ranked based on estimated means for root traits, with lines E20, F1, and F8 showing high rankings, while E4 and F5 received low rankings for most traits. To associate root traits with nitrogen (N) fixation and field agronomic performance, we performed redundancy analysis (RDA). The quantified root traits accounted for significant variation in the agronomic traits (R2 = ∼30%, p < 0.001). RDA showed a positive association between lodging susceptibility and root system NW and between plant height and root system ND. RD was positively associated with grain yield and N fixation. N fixation was positively associated with the number of lateral roots. The findings of this study indicate that variation for seedling root traits in pea could aid selection for N fixation and other important agronomic traits.

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Enhancing Nutrient Starvation Tolerance in Rice

Vinod

2015

Genetic Manipulation in Plants for Mitigation of Climate Change

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Molecular Breeding for Phosphorus‐efficient Rice

Cited by 5 publications

References 73 publications

Identification of putative QTLs for seedling stage phosphorus starvation response in finger millet (Eleusine coracana L. Gaertn.) by association mapping and cross species synteny analysis

Identification of putative QTLs for seedling stage phosphorus starvation response in finger millet (Eleusine coracana L. Gaertn.) by association mapping and cross species synteny analysis

Evaluation of variation in seedling root architectural traits and their potential association with nitrogen fixation and agronomic traits in field pea accessions

Enhancing Nutrient Starvation Tolerance in Rice

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