Genetic gains with rapid-cycle genomic selection for combined drought and waterlogging tolerance in tropical maize (Zea mays L.)
| Autor: | Shyam Bir Singh, P.H. Zaidi, Manish B. Patel, J. P. Shahi, K. Seetharam, Ramesh Kumar Phagna, N. S. Barua, M. T. Vinayan, Raman Babu, Juan Burgueño, Akashi Sarma, Reshmi R. Das |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
0301 basic medicine lcsh:QH426-470 Population Genomics Plant Science Biology lcsh:Plant culture 01 natural sciences Zea mays 03 medical and health sciences Genetics lcsh:SB1-1110 Selection Genetic education Selection (genetic algorithm) Genetic diversity education.field_of_study Droughts lcsh:Genetics 030104 developmental biology Agronomy Genetic gain Agronomy and Crop Science Genomic selection Genome Plant 010606 plant biology & botany Waterlogging (agriculture) |
| Zdroj: | The Plant Genome, Vol 13, Iss 3, Pp n/a-n/a (2020) |
| ISSN: | 1940-3372 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text