@article{fdi:010092655,
  title = {{P}henotypic variation among {IR}64 x {TOG}5681 rice ({O}ryza sativa x {O}. glaberrima) chromosome segment substitution lines ({CSSL}) in response to iron toxicity, and its associated {QTL}s},
  author = {{S}ikirou, {M}. and {D}ram{\'e}, {K}. {N}. and {S}aito, {K}. and {B}occo, {R}. and {L}orieux, {M}athias},
  editor = {},
  language = {{ENG}},
  abstract = {{I}ron ({F}e) toxicity presents a significant challenge to rice production in lowland ecosystems globally. {T}he identification of genetic factors responsible for {F}e toxicity tolerance is crucial for the development of tolerant rice varieties. {T}his study aimed to unravel the genetic bases of {F}e toxicity tolerance using quantitative trait locus ({QTL}) mapping. {W}e conducted phenotypic evaluations for {F}e toxicity tolerance on 54 chromosome segment substitution lines ({CSSL}s) obtained from a cross between the moderately susceptible {IR}64 ({O}. sativa) and the tolerant donor {TOG}5681 ({O}. glaberrima) under {F}e toxicity stress. {QTL} analysis was performed using agro-morphological traits and microsatellite genotypic data. {W}e observed high heritability estimates for key traits like leaf bronzing score ({LBS}) and grain yield. {S}everal loci associated with agronomic traits, including plant height (q{PH}2.1), panicle number (q{PN}4.1), grain weight (q{GW}4.1), harvest index (q{HI}4.1), maturity (q{M}at6.1), and shoot weight (q{SW}6.1 and q{SW}11.1), were identified. {F}rom the field experiments, three {CSSL} lines ({CCSLOG}254, {CCSLOG}255, and {CCSLOG}256) that exhibit both high yield and tolerance to iron toxicity have been identified, positioning them as promising candidates for breeding programs. {A}dditionally, a major {QTL} (q{LBS}11.1) linked to leaf bronzing ({LBS}) was identified, housing the {O}sb{HLH}q11 gene involved in iron homeostasis regulation. {A} comparative analysis revealed colocation with previously reported {QTL}s, validating their significance. {O}sb{HLH}q11 was found to be conserved across diverse rice germplasm, including lowland {NERICA} ({NE}w {RIC}e for {A}frica) varieties, which were developed through crossing {O}. sativa and {O}. glaberrima. {T}he discovery of q{LBS}11.1 and the candidate gene {O}sb{HLH}q11 offers insights into the genetic mechanisms governing {F}e toxicity tolerance, highlighting potential targets for breeding tolerant rice varieties using marker-assisted selection or genetic engineering strategies.},
  keywords = {{I}ron toxicity ; {R}ice ; {Q}uantitative trait locus ; {O}sb{HLH}q11 ; {T}olerance ; {B}reeding},
  booktitle = {},
  journal = {{E}uphytica},
  volume = {221},
  numero = {2},
  pages = {16 [11 p.]},
  ISSN = {0014-2336},
  year = {2025},
  DOI = {10.1007/s10681-024-03457-5},
  URL = {https://www.documentation.ird.fr/hor/fdi:010092655},
}