Advertisement
Sorghum early vigor affects grain size, striga resistance and might be linked to stay-green phenotype
Upcoming SlideShare
Improving selection efficiency for drought adaptation in pearl millet [Pennis...Improving selection efficiency for drought adaptation in pearl millet [Pennis...
Loading in ... 3
1 of 1
Advertisement

More Related Content

Slideshows for you(20)

Advertisement

Similar to Sorghum early vigor affects grain size, striga resistance and might be linked to stay-green phenotype(20)

More from ICRISAT(20)

Advertisement

Sorghum early vigor affects grain size, striga resistance and might be linked to stay-green phenotype

  1. Feb 2017 Sorghum early vigor affects grain size, striga resistance and might be linked to stay-green phenotype Chadalavada K1 , Vadez V1 , Deshpande S1 , Kholová J1 * Introduction Important agronomic crop traits could be more rapidly improved if only we understood the underlying plant processes and knew their genetics determination. Here we want to demonstrate how the recent technology advances in conjunction with multidisciplinary approaches could considerably enhance our understanding of complex plant functionalities. Material and Methods A recombinant inbred line population (181 progenies) derived from a cross between (N13) and (E36-1) which has been shown to segregate for stay green phenotype and striga resistance was selected. Grain size under optimal field conditions was measured by estimating 100 grain weight. Canopy indexes expressing plant size and growth rate (i.e. early vigor) were assessed with using LeasyScan phenotyping platform (Vadez et al 2015). Agronomic data and striga scores was collected from the field studies. The composite Interval Mapping approach (QTL Cartographer) was used to detect QTLs. Variability in the plant vigor traits ((leaf area: 224.7-494.4 and growth rate: 260.7-540.08) and grain size (1.75 to 3.5 g) in the RIL population of N13 x E36-1. Conclusions • This study showed the plant vigor indexes (canopy size and growth rate) and grain size are possibly functionally linked. Since grain size partially regulates grain nutrients profile such linkage calls for further exploration in breeding • Co-location of vigor traits with traits related to striga resistance and phenology on LG4 strengthens the hypothesis that plant vigor in specific phonological phase is linked to striga resistance • Finally, this study emphasized the pleiotropic effect of plant vigor on the range of agronomically important traits and showcased how the recent technology advancements could help to understand plant functionality at multi-disciplinary level in the scale which can be further employed in the breeding programs. Co location of grain size QTL with QTLs related to early vigor traits (2D growth rate, 2D leaf area, 3D growth rate and 3D leaf area) on LG5a which is harboring the previously studied genetic region of stay green 4. • On LG 4, plant vigor indexes co localized with traits related to striga resistance and phenology. • PCA analysis discriminated inter-relation of the traits which co- localized on LG 4 and LG 5a Co localization of late vigor traits with phenological traits and trait related to striga resistance on LG4. Results • Most of the traits measured had broad sense heritability coefficient h2 > 60% • Within the RIL population, high variability for grain size (1.7g -3.2g) and canopy vigor related indexes (leaf area: 224.7-494.4 and growth rate 260.7-540.08) observed. • QTLs underlying grain size differences were found on LG5a (R2~12%) and co-localized with plant vigor indexes (2D and 3D leaf area and growth rates) which have been previously linked to the processes underlying stay-green phenotype. Principle component analysis (PCA) showed the link between the early vigor traits (leaf area (LA) and growth rates (GR) :2D LA1, 2D GR1, 3D LA1 and 3D GR1) and grain size (GS- measure of 100 grain weight) which are co localized on LG5a and the link between late vigor traits (leaf area (LA) and growth rates (GR) :2D LA3, 2D GR3, 3D LA3 and 3D GR3), phenological traits( days to flowering(DFl), Plant height (PH), Awns, pericarp colour) and striga resistance trait which are co localized on LG4. * Corresponding author: j.kholova@cgiar.org 1 International Crops Research Institute for the Semi-Arid Tropics, Hyderabad Telangana-502 324, India PC2(10.82%) PC1 (40.32%) About ICRISAT: www.icrisat.org ICRISAT’s scientific information: http://EXPLOREit.icrisat.org
Advertisement