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Sorghum early vigor increases grain size, striga resistance and has linkages with some stay-green phenotype

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Relation http://oar.icrisat.org/10708/
 
Title Sorghum early vigor increases grain size, striga resistance and has linkages with some stay-green phenotype
 
Creator Chadalavada, K
Vadez, V
Deshpande, S
Kholova, J
 
Subject Sorghum
 
Description Promising agronomic crop traits could be more accessible to
breeding if we understood their underlying plant processes and
knew their genetics determinacy. Here, we attempt to progress
understanding of the functional linkages between traits using
PCA and quantitative trait loci (QTL) co-localization approach. A
recombinant inbred lines (RIL; 181 progenies) population derived
from a cross between senescent (N13) and stay-green(E36-1)
parental lines was selected. This population was previously
shown to segregate for stay-green expression and Striga resistance
in the field. Here it was phenotyped for: (i) grain size
variability under optimal field conditions; (ii) traits related to
early-vigor (canopy size and growth rate) in a high-throughput
phenotyping platform. Most traits had high heritability (>60%).
Linkage map was constructed (271 molecular markers) and QTL
analysis (Cartographer 2.5) performed using composite interval
mapping function. Two major QTLs influencing canopy size were
found on SBI04 and SBI05. The SBI05 QTL harboring canopy
size co-localized with the grain size QTL and with the genetic
region of stg-4 (stay green) QTL (responsible for leaf size distribution).
This links the vigor traits to the variability in grain size
and leaf development (i.e. stay-green mechanism) the latter
possibly explaining the variability in grain size. Since grain size
partially regulates grain nutrients profile, such linkage calls for
further exploration in breeding. The SBI-04 QTL for canopy size
co-localized with QTLs for Striga resistance, strengthening the
hypothesis that plant vigor enhances Striga resistance. Vigor appears
to explain several traits and could be rapidly screened at
the LeasyScan facility.
 
Date 2017-02
 
Type Conference or Workshop Item
PeerReviewed
 
Format application/pdf
 
Language en
 
Rights —
 
Identifier http://oar.icrisat.org/10708/1/225.pdf
Chadalavada, K and Vadez, V and Deshpande, S and Kholova, J (2017) Sorghum early vigor increases grain size, striga resistance and has linkages with some stay-green phenotype. In: InterDrought-V, February 21-25, 2017, Hyderabad, India.