Claim · model-written summary
The 82 improved Indonesian rice varieties showed significant variation in grain length, width and thickness.
- Taxon
- rice
Oryza sativat0 - Outcome
- variation in grain length, width, and thicknesse0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingDirectionValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice varieties”
e0“Phenotypic evaluation revealed significant variation in grain length, width, and thickness”
Title
Reflinur Reflinur; Adin Heriyan Nugroho; Zidni Muflikhati; et al. Journal of Genetic Engineering and Biotechnology 2026. doi:10.1016/j.jgeb.2026.100661
Other claims from this paper (18)
- Observation Principal component analysis condensed the four grain traits into two axes explaining 94.4% of variance.
- Observation Principal component analysis separated the genotypes into three clusters largely corresponding to indica and japonica types.
- Observation Across 32 markers, 157 alleles were detected in the rice varieties.
- Observation Average gene diversity (He) was 0.30 with SSR markers.
- Observation Average gene diversity (He) was 0.29 with SS-STS markers.
- Observation Average gene diversity (He) was 0.22 with SCoT markers.
- Observation Polymorphic information content was generally low.
- Observation SS-STS markers showed fixation of indica-type alleles, consistent with the major varieties IR64 and Ciherang.
- Observation Rare alleles were scarce, at 1.1-1.5 per locus.
- Observation SCoT markers generated 8.5 bands per locus.
- Observation Heterozygosity remained low, at 0.005-0.010.
- Observation AMOVA showed 90-91% of the genetic variation was distributed within subpopulations.
- Observation Only 5-8% of the genetic variation was explained by differences among subpopulations.
- Observation Population structure was weak, with FST of 0.055 for SSR and 0.084 for SS-STS.
- Observation STRUCTURE analysis inferred different numbers of subpopulations for each marker type (K = 7 for SS-STS, K = 2 for SSR, K = 4 for SCoT).
- Observation Phylogenetic clustering separated the genotypes into two to three subpopulations, partly corresponding to grain type and inferred subspecies background.
- Observation The authors conclude molecular diversity is limited despite phenotypic variation, suggesting genetic narrowing from repeated use of closely related parental lines in breeding.
- Recommendation Broader germplasm, including landraces and wild relatives, is essential for future rice breeding.