Claim · model-written summary
NAM-B1 is associated with differences in senescence.
- Taxon
- wheat
Triticum aestivumt0 - Gene
- NAM-B1e0
- Outcome
- differences in senescencee0
Not reportedMaterialCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentComparatorSettingDirectionValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NAC transcription factor (NAM-B1) associated with differences in senescence”
t0“wheat”
Title
Improved remobilization of Zn, Fe and N from the straw to the wheat grain
Jorge Dubcovsky; Cristóbal Uauy; Assaf Distelfeld; et al. eScholarship (California Digital Library) 2009
Other claims from this paper (18)
- Observation The high-grain protein content gene Gpc-B1 cloned from wild wheat encodes a NAC transcription factor (NAM-B1).
- Observation The ancestral wild wheat allele is functional.
- Observation The allele present in modern wheat varieties is either deleted or has a frame shift mutation and is non-functional.
- Intervention effect Introgression of the functional allele increased grain protein, Fe and Zn concentration by 5-10% on average.
- Intervention effect Introgression of the functional allele increased total grain N yield by about 5%.
- Intervention effect The increase in total grain N yield was balanced by a similar decrease in the straw.
- Association The functional Gpc-B1 allele was associated with a significant decrease in grain Cd in some genotypes.
- Intervention effect The functional Gpc-B1 allele accelerates senescence.
- Intervention effect The functional Gpc-B1 allele reduced grain filling periods.
- Intervention effect In some genotypes the functional Gpc-B1 allele resulted in smaller grain size (about 5%).
- Observation In some lines the smaller grains were compensated by other yield components, giving no significant difference in yield.
- Recommendation The authors suggest that breeding can be used to ameliorate the negative effect of this gene on grain size.
- Intervention effect RNA interference reducing RNA levels of the multiple NAM homologs delayed senescence by more than 3 weeks compared with non-transgenic control lines.
- Intervention effect RNA interference of the NAM homologs reduced wheat grain protein, zinc and iron content by more than 30% compared with non-transgenic controls.
- Observation TILLING mutants for all the NAM genes confirmed delayed senescence in some of them.
- Association Lines with higher amounts of NAM transcripts (non-transgenic controls) are able to remobilize more minerals in a shorter time frame.
- Mechanism More efficient remobilization of N and minerals to the grain is the proposed source of the observed increases in total N yield.
- Recommendation The absence of the functional NAM-B1 allele in modern wheat germplasm suggests a broad potential impact of the functional allele in cultivated durum and bread wheat varieties.