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Phenotyping sorghum reference set for drought tolerance

OAR@ICRISAT

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Relation http://oar.icrisat.org/5188/
 
Title Phenotyping sorghum reference set for drought tolerance
 
Creator Upadhyaya, H D
 
Subject Sorghum
 
Description Drought is one of the most important yields reducing abiotic constraint worldwide. It is proposed
to evaluate sorghum reference germplasm set (360 of the 384 reference set accessions), selected
based on the genotyping information of composite collection (41 SSR loci data on 3372 accessions), for post-flowering drought tolerance. In the first year, the reference set will be
characterised for morpho-agronomic traits to classify accessions into distinct flowering and plant
height groups at ICRISAT locations in India, Mali, and Kenya. In the second year, these
subgroups will be evaluated for post-flowering drought tolerant traits at three ICRISAT locations
(as above). In addition, they will also be evaluated at ICRISAT Patancheru, India for seed
micronutrients (Zn and Fe) under varying water regimes (stressed vs unstressed conditions) to
identify seed micronutrient dense lines. In third year, selected reference set accessions and staygreen
QTL introgression lines will be evaluated for water uptake under stressed conditions in
PVC tubes (2.0-m long and 25-cm diameter), and for the proportion of water used prior/after
anthesis. In the same year, the most promising post-flowering drought tolerant reference set
accessions and stay-green QTL introgression lines will be multilocationally evaluated for postflowering
drought tolerance at ICRISAT and NARS locations in India and Africa. In addition to
evaluating for post-flowering drought tolerance traits, additional data will be collected on
grain/stover yield and component traits to identify lines that are better able to maintain normal
growth/yield processes under stress. It is proposed to evaluate this select group of materials in
the fourth year (subject to GCP provides funds) at NARS locations to generate additional data on
the performance of post-flowering drought tolerant lines. At the completion of project, we will
have a better understanding of post-flowering drought tolerance in sorghum, the traits associated
with post-flowering drought tolerance, and a range of post-flowering drought tolerant sorghum
lines for use in crop improvement programmes.
 
Date 2008
 
Type Conference or Workshop Item
PeerReviewed
 
Format application/pdf
 
Language en
 
Rights —
 
Identifier http://oar.icrisat.org/5188/1/Phenotyping%20sorghum%20reference%20set%20for%20drought%20tolerance%202008.pdf
Upadhyaya, H D (2008) Phenotyping sorghum reference set for drought tolerance. In: Generation Challenge Program Annual Research Meeting, 12-16 September 2006, Sao Paulo, Brazil.