Rapid generation advance (RGA) in chickpea to produce up to seven generations per year and enable speed breeding
| Autor: | Madhuparni Sen, Pooran M. Gaur, Sobhan B. Sajja, Srinivasan Samineni |
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| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
0301 basic medicine photoperiodism Artificial light lcsh:S food and beverages Plant Science Biology Flowering time lcsh:S1-972 01 natural sciences lcsh:Agriculture Cycle time 03 medical and health sciences Horticulture 030104 developmental biology Anthesis Germination Cultivar Plant breeding lcsh:Agriculture (General) Agronomy and Crop Science 010606 plant biology & botany |
| Zdroj: | Crop Journal, Vol 8, Iss 1, Pp 164-169 (2020) |
| ISSN: | 2214-5141 |
| Popis: | This study was aimed at developing a protocol for increasing the number of generation cycles per year in chickpea (Cicer arietinum L.). Six accessions, two each from early (JG 11 and JG 14), medium (ICCV 10 and JG 16), and late (CDC-Frontier and C 235) maturity groups, were used. The experiment was conducted for two years under glasshouse conditions. The photoperiod was extended to induce early flowering and immature seeds were germinated to further reduce generation cycle time. Compared to control, artificial light caused a reduction in flowering time by respectively 8–19, 7–16, and 11–27 days in early-, medium-, and late-maturing accessions. The earliest stage of immature seed able to germinate was 20–23 days after anthesis in accessions of different maturity groups. The time period between germination and the earliest stage of immature seed suitable for germination was considered one generation cycle and spanned respectively 43–60, 44–64, and 52–79 days in early-, medium-, and late-maturing accessions. However, the late-maturing accession CDC-Frontier could not be advanced further after three generation cycles owing to the strong influence of photoperiod and temperature. The mean total number of generations produced per year were respectively 7, 6.2, and 6 in early-, medium-, and late-maturing accessions. These results have encouraging implications for breeding programs: rapid progression toward homozygosity, development of mapping populations, and reduction in time, space and resources in cultivar development (speed breeding). Keywords: Photoperiod, Immature seeds, Flowering, Rapid generation turnover, Speed breeding |
| Databáze: | OpenAIRE |
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