@article{fdi:010067614,
  title = {{R}ice panicle plasticity in {N}ear {I}sogenic {L}ines carrying a {QTL} for larger panicle is genotype and environment dependent},
  author = {{A}driani, {D}. {E}. and {D}ingkuhn, {M}. and {D}ardou, {A}. and {A}dam, {H}{\'e}l{\`e}ne and {L}uquet, {D}. and {L}afarge, {T}.},
  editor = {},
  language = {{ENG}},
  abstract = {{B}ackground: {P}anicle architectural traits in rice (branching, rachis length, spikelet number) are established between panicle initiation and heading stages. {T}hey vary among genotypes and are prone to {G}enotype x {E}nvironment interactions. {T}ogether with panicle number, panicle architecture determines sink-based yield potential. {N}umerous studies analyzed genetic and environmental variation of plant morphology, but the plasticity of panicle structure is less well understood. {T}his study addressed the response of rice panicle size and structure to limited light availability at plant level for near-isogenic lines ({NIL}s) with {IR}64 or {IRRI}146 backgrounds, carrying the {QTL} q{TSN}4 (syn. {SPIKE}) for large panicles. {F}ull light and shading in the greenhouse and two population densities in the field were implemented. {T}he image analysis tool {P}-{TRAP} was used to analyze the architecture of detached panicles. {R}esults: {T}he q{TSN}4 increased total branch length, branching frequency and spikelet number per panicle in {IRRI}146 background in the field and greenhouse, and in {IR}64 background in the greenhouse, but not for {IR}64 in the field. {I}n the field, however, q{TSN}4 reduced panicle number, neutralizing any potential yield gains from panicle size. {S}hading during panicle development reduced spikelet and branch number but q{TSN}4 mitigated partly this effect. {S}pikelet number over total branch length (spikelet density) was a stable allometry across genotypes and treatments with variation in spikelet number mainly due to the frequency of secondary branches. {S}pikelet number on the main tiller was correlated with stem growth rate during panicle development, indicating that effects on panicle size seemed related to resources available per tiller. {C}onclusions: {T}he q{TSN}4 effects on panicle spikelet number appear as indirect and induced by upstream effects on pre-floral assimilate resources at tiller level, as they were (1) prone to {G} x {E} interactions, (2) non-specific with respect to panicle architectural traits, and (3) associated with pre-floral stem growth rate.},
  keywords = {{P}anicle plasticity ; {P}anicle architecture ; {B}ranch number ; {B}ranch length ; {S}pikelet number per panicle ; {P}re-floral stem vigor ; q{TSN}4},
  booktitle = {},
  journal = {{R}ice},
  volume = {9},
  numero = {},
  pages = {art. 28 [15 p.]},
  ISSN = {1939-8425},
  year = {2016},
  DOI = {10.1186/s12284-016-0101-x},
  URL = {https://www.documentation.ird.fr/hor/fdi:010067614},
}