Rapid generation advance (RGA) in chickpea to produce up to seven generations per year and enable speed breeding

Samineni, S and Sen, M and Sajja, S B and Gaur, P M (2020) Rapid generation advance (RGA) in chickpea to produce up to seven generations per year and enable speed breeding. The Crop Journal (TSI), 8 (1). pp. 164-169. ISSN 22145141

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Abstract

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 CDCFrontier 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).

Item Type:	Article
Divisions:	Research Program : Asia
CRP:	CGIAR Research Program on Grain Legumes and Dryland Cereals (GLDC)
Uncontrolled Keywords:	Photoperiod, Immature seeds, Flowering, Rapid generation, Turnover Speed breeding
Subjects:	Others > Plant Breeding Mandate crops > Chickpea Others > Legume Crops
Depositing User:	Mr Arun S
Date Deposited:	24 Feb 2020 09:08
Last Modified:	28 Mar 2020 07:05
URI:	http://oar.icrisat.org/id/eprint/11379
Official URL:	https://doi.org/10.1016/j.cj.2019.08.003
Projects:	UNSPECIFIED
Funders:	UNSPECIFIED
Acknowledgement:	This work was undertaken as part of the CGIAR Research Program on Grain Legumes and Dryland Cereals. We would like to thank Dr. Mahesh D. Mahendrakar, Research Fellow, chickpea breeding and Dr. Yashoda, Research Fellow at ICRISAT, for their help during data compilation and technical inputs in manuscript preparation.
Links:	Google Scholar

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