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Genetic Variation and Postflowering Drought Effects on Seed Iron and Zinc in ICRISAT Sorghum Mini Core Collection

OAR@ICRISAT

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Field Value
 
Relation http://oar.icrisat.org/9340/
http://dx.doi.org/10.2135/cropsci2015.05.0308
10.2135/cropsci2015.05.0308
 
Title Genetic Variation and Postflowering Drought Effects on Seed Iron and Zinc in ICRISAT Sorghum Mini Core Collection
 
Creator Upadhyaya, H D
Dwivedi, S L
Singh, Sube
Sahrawat, K L
Singh, S
 
Subject Sorghum
Genetics and Genomics
 
Description Drought stress invariably reduces yield and may
alter seed chemistry. This experiment was initiated
to characterize the sorghum [Sorghum
bicolor (L.) Moench] mini core collection for
genetic variation and to study the effect of postflowering
drought on seed Fe and Zn concentrations.
Accessions with similar maturity, together
with controls, were evaluated in split-plot design
under irrigated and drought-stressed environments
for two postrainy seasons. Residual (or
restricted) maximum likelihood (REML) analysis
of data considering genotypes as random and
drought and year as fixed indicated highly significant
variance as a result of genotypes. Highly
significant effects of drought (D), year (Y), and D
x Y interaction emphasized need for multilocation
evaluation of germplasm for agronomic and
seed nutritional traits. About twofold variation
in Fe (25.8–48.9 mg kg−1 seed) and threefold
variation in Zn (13.5–42.6 mg kg−1 seed) concentrations
was observed across environments.
Eleven accessions with high seed Fe, 14 accessions
with high Zn, and nine accessions high in
both Fe and Zn were identified. These accessions,
however, produced low seed yields. In
addition, six and four accessions, respectively,
showed 8 to 39% and 9 to 38% greater Fe and
Zn over control IS 33844 and produced seed
yields similar to that of IS 33844. Significant
rank correlation (0.70) indicated that accessions
with high Fe or Zn under irrigated environments
are also expected to perform well under
drought-stressed environments. Significantly
positive correlation between Fe and Zn indicated
simultaneous improvement as a realistic
approach in breeding. The identified germplasm
are ideal genetic resources for the development
of Fe- and Zn-dense sorghum cultivars.
 
Publisher Crop Science Society of America
 
Date 2016
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Rights —
 
Identifier http://oar.icrisat.org/9340/1/CropScience_2016.pdf
Upadhyaya, H D and Dwivedi, S L and Singh, Sube and Sahrawat, K L and Singh, S (2016) Genetic Variation and Postflowering Drought Effects on Seed Iron and Zinc in ICRISAT Sorghum Mini Core Collection. Crop Science, 56 (1). pp. 1-11. ISSN 0011-183X