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Genetic gains with rapid-cycle genomic selection for combined drought and waterlogging tolerance in tropical maize (Zea mays L.)

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Title Genetic gains with rapid-cycle genomic selection for combined drought and waterlogging tolerance in tropical maize (Zea mays L.)
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Creator Reshmi R. Das, M. T. Vinayan, Manish B. Patel, Ramesh K. Phagna, S. B. Singh, J. P. Shahi, Akashi Sarma, N. S. Barua, Raman Babu, K. Seetharam, Juan A. Burgueño and P. H. Zaidi
 
Subject Drought tolerance, genetic gain, genomic selection, rapid‐cycle genomic selection, ingle‐nucleotide polymorphism, waterlogging tolerance.
 
Description Not Available
Rapid cycle genomic selection (RC-GS) helps to shorten the breeding cycle and
reduce the costs of phenotyping, thereby increasing genetic gains in terms of both
cost and time. We implemented RC-GS on two multi-parent yellow synthetic
(MYS) populations constituted by intermating ten elite lines involved in each
population, including four each of drought and waterlogging tolerant donors
and two commercial lines, with proven commercial value. Cycle 1 (C1) was constituted
based on phenotypic selection and intermating of the top 5% of 500 S2
families derived from each MYS population, test-crossed and evaluated across
moisture regimes. C1 was advanced to the next two cycles (C2 and C3) by intermating
the top 5% selected individuals with high genomic estimated breeding
values (GEBVs) for grain yield under drought and waterlogging stress. To estimate
genetic gains, population bulks from each cycle were test-crossed and evaluated
across locations under different moisture regimes. Results indicated that
the realised genetic gain under drought stress was 0.110 t ha−1 yr−1 and 0.135 t
ha−1 yr−1, respectively, for MYS-1 and MYS-2. The gain was less under waterlogging
stress, where MYS-1 showed 0.038 t ha−1 yr−1 and MYS-2 reached 0.113 t
ha−1 yr−1. Genomic selection for drought and waterlogging tolerance resulted in
no yield penalty under optimal moisture conditions. The genetic diversity of the
two populations did not change significantly after two cycles of GS, suggesting
that RC-GS can be an effective breeding strategy to achieve high genetic gains
without losing genetic diversity.
Bundesministerium für Wirtschaftliche Zusammenarbeit undEntwicklung, Grant/Award Number: 15.7860.8-001.00
 
Date 2020-12-31T10:58:10Z
2020-12-31T10:58:10Z
2020-07-20
 
Type Research Paper
 
Identifier Reshmi R. Das, M. T. Vinayan, Manish B. Patel, Ramesh K. Phagna, S. B. Singh, J. P. Shahi, Akashi Sarma, N. S. Barua, Raman Babu, K. Seetharam, Juan A. Burgueño and P. H. Zaidi. 2020. Genetic gains with rapid-cycle genomic selection for combined drought and waterlogging tolerance in tropical maize (Zea mays L.) The Plant Genome 13(3): 1:10 https://doi.org/10.1002/tpg2.20035
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http://krishi.icar.gov.in/jspui/handle/123456789/44326
 
Language English
 
Relation Not Available;
 
Publisher The Plant Genome