Journal
EUPHYTICA
Volume 215, Issue 8, Pages -Publisher
SPRINGER
DOI: 10.1007/s10681-019-2459-5
Keywords
Doubled haploid (DH); Haploid male fertility (HMF); Haploid female fertility (HFF); Haploid fertility (HF); Genome-wide association study (GWAS); Genomic prediction (GP)
Categories
Funding
- Bill and Melinda Gates foundation (BMGF) through the project A Doubled Haploid Facility for Strengthening Maize Breeding Programs in Africa'' [OPP1028335]
- BMGF
- U.S. Agency for International Development (USAID) through the project Stress tolerant Maize for Africa (STMA)'' [OPP1134248]
- CGIAR Research Program on Maize (MAIZE), MasAgro-Maize project - Secretariat of Agriculture, Livestock, Rural Development, Fisheries and Food (SAGARPA), Govt. of Mexico
- Limagrain
- Government of Australia
- Government of Belgium
- Government of Canada
- Government of China
- Government of France
- Government of India
- Government of Japan
- Government of Korea
- Government of Mexico
- Government of Netherlands
- Government of New Zealand
- Government of Norway
- Government of Sweden
- Government of Switzerland
- Government of U.K.
- Government of U.S.
- World Bank
- Bill and Melinda Gates Foundation [OPP1028335] Funding Source: Bill and Melinda Gates Foundation
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Efficient production and use of doubled haploid lines can greatly accelerate genetic gains in maize breeding programs. One of the critical steps in standard doubled haploid line production is doubling the haploid genome using toxic and costly mitosis-inhibiting chemicals to achieve fertility in haploids. Alternatively, fertility may be spontaneously restored by natural chromosomal doubling, although generally at a rate too low for practical applications in most germplasm. This is the first large-scale genome-wise association study to analyze spontaneous chromosome doubling in haploids derived from tropical maize inbred lines. Induction crosses between tropicalized haploid inducers and 400 inbred lines were made, and the resulting haploid plants were assessed for haploid male fertility which refers to pollen production and haploid fertility which refers to seed production upon self-fertilization. A small number of genotypes were highly fertile and these fertility traits were highly heritable. Agronomic traits like plant height, ear height and tassel branch number were positively correlated with fertility traits. In contrast, haploid induction rate of the source germplasm and plant aspect were not correlated to fertility traits. Several genomic regions and candidate genes were identified that may control spontaneous fertility restoration. Overall, the study revealed the presence of large variation for both haploid male fertility and haploid fertility which can be potentially exploited for improving the efficiency of doubled haploid derivation in tropical maize germplasm.
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