Stress-induced flowering

Wada, Kaede C.; Takeno, Kiyotoshi

doi:10.4161/psb.5.8.11826

Cited by 159 publications

(83 citation statements)

References 30 publications

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“…Generation time was shorter than for plants grown at lower density in the previous speed breeding experiments (Supplementary Tables 28, 29). This was likely caused by stress or plant competition as a result of the higher density, which is known to hasten flowering [8]. In most cases, each plant produced a single viable tiller containing on average 19.0 ± 1.3 and 18.6 ± 1.8 seeds for wheat and barley, respectively.…”

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confidence: 99%

Speed breeding: a powerful tool to accelerate crop research and breeding

Watson

Ghosh

Williams

et al. 2017

Preprint

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The growing human population and a changing environment have raised significant concern for global food security, with the current improvement rate of several important crops inadequate to meet future demand [1]. This slow improvement rate is attributed partly to the long generation times of crop plants. Here we present a method called 'speed breeding', . CC-BY 4.0 International license It is made available under a (which was not peer-reviewed) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity.The copyright holder for this preprint . http://dx.doi.org/10.1101/161182 doi: bioRxiv preprint first posted online Jul. 9, 2017; Watson and Ghosh et al. (2017) 2 which greatly shortens generation time and accelerates breeding and research programs.Speed breeding can be used to achieve up to 6 generations per year for spring wheat (Triticum aestivum), durum wheat (T. durum), barley (Hordeum vulgare), chickpea (Cicer arietinum), and pea (Pisum sativum) and 4 generations for canola (Brassica napus), instead of 2-3 under normal glasshouse conditions. We demonstrate that speed breeding in fully-enclosed controlled-environment growth chambers can accelerate plant development for research purposes, including phenotyping of adult plant traits, mutant studies, and transformation.The use of supplemental lighting in a glasshouse environment allows rapid generation cycling through single seed descent and potential for adaptation to larger-scale crop improvement programs. Cost-saving through LED supplemental lighting is also outlined. We envisage great potential for integrating speed breeding with other modern crop breeding technologies, including high-throughput genotyping, genome editing, and genomic selection, accelerating the rate of crop improvement.For most crop plants, the breeding of new, advanced cultivars, takes several years. Following crossing of selected parent lines, 4-6 generations of inbreeding are typically required to develop genetically stable lines for evaluation of agronomic traits and yield. This is particularly timeconsuming for field-grown crops that are often limited to only 1-2 generations per year. Here, we present flexible protocols for "speed breeding" that use prolonged photoperiods to accelerate the developmental rate of plants [2], thereby reducing generation time. We highlight the opportunity presented by speed breeding and detail protocols to inspire widespread adoption as a state-of-theart breeding and research tool.To evaluate speed breeding as a method to accelerate applied and basic research on cereal species, standard genotypes of spring bread wheat (T. aestivum), durum wheat (T. durum), barley (H. vulgare) and the model grass Brachypodium distachyon were grown in a controlled environment room with extended photoperiod (22 hours light/2 hours dark) ( Fig. 1; Methods:Speed breeding I; Supplementary Table 1). A light/dark period was chosen over a continuous photoperiod to support functional expression of circadian clock genes [3]. Growth was compare...

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confidence: 99%

Speed breeding: a powerful tool to accelerate crop research and breeding

Watson

Ghosh

Williams

et al. 2017

Preprint

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“…8,9 As depicted in the schematic model (Fig. 2), we propose that stress-mediated acceleration of flowering is in part through reduction of the BBX19 expression levels in response to accumulation of the stress-specific retrograde signal MEcPP.…”

Section: From Retrograde Signaling To Flowering Timementioning

confidence: 93%

From retrograde signaling to flowering time

Wang¹,

Dehesh

2015

Plant Signaling & Behavior

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“…It is documented that onset of floral induction requires some stress factors. During phase transition from vegetative to reproductive, the cellular antioxidant status of plants tends to increases, suggesting that plants being exposed to stressful conditions for the onset of reproductive growth (Gielis et al, 1999, Wada andTakeno 2010). Thus increase in antioxidant enzymes activities during bud growth and their inductions by paclobutrazol indicates possible production of high levels of ROS during floral process due to high metabolic demand and/possible by stress factors, and their inactivation by inductions in such enzymes.…”

Section: Changes In Enzymatic Antioxidantsmentioning

confidence: 99%