Can a speed breeding approach accelerate genetic gain in pigeonpea?

Saxena, K. B.; Saxena, Rachit K.; Hickey, Lee T.; Varshney, Rajeev K.

doi:10.1007/s10681-019-2520-4

Cited by 40 publications

(27 citation statements)

References 19 publications

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“…The use of speed breeding has been adapted to different conditions from fully enclosed growth chambers to greenhouses to facilitate single‐seed descent (SSD) systems in plant breeding programs (Ghosh et al., 2018). For instance, spring wheat, durum wheat ( Triticum durum L.) (Ghosh et al., 2018), barley, chickpea ( Cicer arietinum L.) (Ghosh et al., 2018), pea ( Pisum sativum L.) (Ghosh et al., 2018), pigeonpea ( Cajanus cajan L.) (Saxena, Saxena, Hickey, & Varshney, 2019), and orphan crops (Chiurugwi, Kemp, Powell, & Hickey, 2019) can be grown up to six consecutive generations per year via the speed breeding technique instead of two or three generations per year under normal greenhouse conditions. In oat, the use of speed breeding has shown a 15‐ to 20‐d average reduction in flowering time compared with the conventional system (Ghosh et al., 2018; Heuschele, Case, & Smith, 2019; Liu et al., 2016).…”

Section: Introductionmentioning

confidence: 99%

Speed breeding and early panicle harvest accelerates oat (Avena sativa L.) breeding cycles

et al. 2020

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Increasing the response to selection in plant breeding programs by reducing the time required to complete a generation of inbreeding can significantly shorten the time to release a cultivar. Recently, ‘speed breeding’ strategies that manage temperature, photoperiod, and micronutrients showed a significant reduction in time to inbreeding in several crops. The goal of this study was to determine if the speed breeding system can be effectively applied to oat (Avena sativa L.) for a single‐seed descent breeding scheme and to determine if seeds can be harvested early with acceptable germination for breeding purposes. Two systems were evaluated using eight genetically diverse oat genotypes under speed breeding (22‐h photoperiod) and normal growing conditions (16 h) in a randomized complete block design with a factorial arrangement of treatments and three replications. Our results indicated a significant reduction in time for all the phenological stages evaluated when speed breeding was used, compared with normal growing conditions. In particular, the reduction in time to flowering date was 11 d (62 vs. 51 d on average). Germination evaluations indicated that by 21 d after flowering, it was possible to obtain acceptable germination levels for all genotypes evaluated. This should be of great importance in breeding systems where single‐seed descent can be used.

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Section: Introductionmentioning

confidence: 99%

Speed breeding and early panicle harvest accelerates oat (Avena sativa L.) breeding cycles

et al. 2020

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“…Applying the single seed descent (SSD) method under highly controlled growth conditions has reduced generation time in wheat and barley 2 . Harvesting and germination of the immature seeds, thereby shortening the generation cycle, have been proven for wheat, pigeon pea, and faba bean 2 , 34 , 35 . Hence, there is a potential for further reducing the generation cycle, at least by three to four weeks in our oilseed rape populations, by combining SSD with immature seed harvesting and germination under greenhouse conditions.…”

Section: Discussionmentioning

confidence: 99%

Genomic background selection to reduce the mutation load after random mutagenesis

Karunarathna

Patiranage

Harloff

et al. 2021

Sci Rep

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Random mutagenesis is a standard procedure to increase allelic variation in a crop species, especially in countries where the use of genetically modified crops is limited due to legal constraints. The chemical mutagen EMS is used in many species to induce random mutations throughout the genome with high mutation density. The major drawback for functional analysis is a high background mutation load in a single plant that must be eliminated by subsequent backcrossing, a time and resource-intensive activity. Here, we demonstrate that genomic background selection combined with marker-assisted selection is an efficient way to select individuals with reduced background mutations within a short period. We identified BC1 plants with a significantly higher share of the recurrent parent genome, thus saving one backcross generation. Furthermore, spring rapeseed as the recurrent parent in a backcrossing program could accelerate breeding by reducing the generation cycle. Our study depicts the potential for reducing the background mutation load while accelerating the generation cycle in EMS-induced winter oilseed rape populations by integrating genomic background selection.

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“…The study demonstrated shortening of generation time by combining harvesting of immature seeds and single pod descent method. Another SB-based strategy by Saxena et al (2019) employed early maturating photoperiod-insensitive genotypes, and showed its potential to deliver new early maturing cultivars with the successful reduction of up to 4-5 years. SB recipes combined with single seed descent and MAS or GS will provide greater genetic gains over conventional methods of plant breeding (Varshney et al 2021).…”

Section: Rapid Generation Turnover (Rgt) Technologiesmentioning

confidence: 99%

Next generation breeding in pulses: Present status and future directions

Kumar

Mir

Sharma

et al. 2021

Crop Breed. Appl. Biotechnol.

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Human population growth in combination with changing patterns of global food consumption under climate change is posing formidable challenge to attaining sustainable global food security. Besides being economically viable sources of plant based protein for human consumption, pulses are also beneficial for the environment owing to their inherent capacity of nitrogen fixation. Hence, further development of pulses has become imperative in the vigorously transitional global scenario where flourishing anthropogenic activities are triggering irreplaceable depletion of natural resources. During past years, considerable attention has been given on the use of next generation sequencing for enriching the genomic resources in pulse crops including high-throughput DNA markers, candidate gene(s) and QTLs for predicting plant phenotypes, and whole genome sequences. With refinements in DNA sequencing technologies and computational analytical tools, the rapidly grown numbers of sequenced pulse genomes offer novel insights on crop evolution and breeding history.Integration of new-generation genomic and phenomic tools with generation acceleration procedures like genomic selection and speed breeding could greatly accelerate progress in pulses genetic improvement. The present review discusses current status and future scope of using next-generation breeding approaches in pulses that will cause not only an increase in the rate of developing climateresilient superior cultivars but also help to reach to goal of global food security.

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Can a speed breeding approach accelerate genetic gain in pigeonpea?

Cited by 40 publications

References 19 publications

Speed breeding and early panicle harvest accelerates oat (Avena sativa L.) breeding cycles

Speed breeding and early panicle harvest accelerates oat (Avena sativa L.) breeding cycles

Genomic background selection to reduce the mutation load after random mutagenesis

Next generation breeding in pulses: Present status and future directions

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