Understanding Past, and Predicting Future, Niche Transitions based on Grass Flowering Time Variation

Preston, Jill C.; Fjellheim, Siri

doi:10.1104/pp.20.00100

Cited by 18 publications

(15 citation statements)

References 196 publications

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“…At high temperatures, an Hvckx3 mutant phenocopied Hvmads1 (Fig. 7g), further supporting our conclusion that HvMADS1 integrates thermal Seasonal temperature changes affect plant growth, flowering time, and phenotypic plasticity 2,3,11,15 . A severe consequence of climate change is the projected increase in temperature, posing a significant challenge for maintaining agricultural crop yield and quality 17,18 .…”

Section: Discussionsupporting

confidence: 83%

“…An increase in ambient temperature (e.g., > 25 °C) leads to delayed inflorescence meristem development, and reduced the number of spikelet primordia both in wheat and barley 12,13 , indicating that high temperatures inhibit both inflorescence and spikelet development during early reproductive stages of Triticeae crops. With climate change likely to drive changes in global plant phenology 2,14 , the adaptation of fitness-related traits is becoming paramount in plants, including many crops 1,2,12,15 . Extreme temperature changes are speculated to impact reproductive growth in particular 16 , which is potentially devastating for grain yield in cereal crops 17,18 .…”

Section: Introductionmentioning

confidence: 99%

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MADS1 maintains barley spike morphology at high ambient temperatures

Kuijer

Yang

et al. 2021

Nat. Plants

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Temperature stresses affect plant phenotypic diversity. The developmental stability of the inflorescence, required for reproductive success, is tightly regulated by the interplay of genetic and environmental factors. However, the mechanism(s) underpinning whether and how plant inflorescence architecture has responded to temperature are largely unknown. We demonstrate that the barley SEPALLATA MADS-box protein HvMADS1 is responsible for maintaining an unbranched spike architecture at high temperatures, while the loss-of-function mutant forms a branched inflorescence-like structure. HvMADS1 exhibits increased binding to target promoters via A-tract CArG-box motifs, which change conformation with temperature. Target genes for high-temperature dependent HvMADS1 activation are predominantly associated with inflorescence differentiation and phytohormone signalling. HvMADS1 directly regulates the cytokinin-degrading enzyme HvCKX3 to integrate temperature response and cytokinin homeostasis, which is required to repress meristem cell cycle/division. Our findings reveal a novel mechanism by which genetic factors direct plant thermomorphogenesis, extending the recognised role of plant MADS-box proteins in floral development.

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Section: Discussionsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

MADS1 maintains barley spike morphology at high ambient temperatures

Kuijer

Yang

et al. 2021

Nat. Plants

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“…In any living organisms, changes in developmental processes throughout the year often define their living strategy. This is particularly true of annual plants, such as Arabidopsis , as well many of the crops that feed humanity (rice, corn, and wheat), as they have to precisely plan for germination, growth, reproduction, and senescence to complete a life cycle in 1 year ( Preston and Fjellheim, 2020 ). The way they respond to each seasonal change is also a tactical decision, for example, to coincide with pollinators, outsmart potential opponents, or conversely, modify flowering time to avoid competition ( Franks and Hoffmann, 2012 ).…”

Section: Photoperiodic Signalingmentioning

confidence: 99%

Photoperiodic Signaling and Senescence, an Ancient Solution to a Modern Problem?

2021

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The length of the day (photoperiod) is a robust seasonal signal originated by earth orbital and translational movements, a resilient external cue to the global climate change, and a predictable hint to initiate or complete different developmental programs. In eukaryotic algae, the gene expression network that controls the cellular response to photoperiod also regulates other basic physiological functions such as starch synthesis or redox homeostasis. Land plants, evolving in a novel and demanding environment, imbued these external signals within the regulatory networks controlling organogenesis and developmental programs. Unlike algae that largely have to deal with cellular physical cues, within the course of evolution land plants had to transfer this external information from the receiving organs to the target tissues, and mobile signals such as hormones were recruited and incorporated in the regulomes. Control of senescence by photoperiod, as suggested in this perspective, would be an accurate way to feed seasonal information into a newly developed function (senescence) using an ancient route (photoperiodic signaling). This way, the plant would assure that two coordinated aspects of development such as flowering and organ senescence were sequentially controlled. As in the case of senescence, there is growing evidence to support the idea that harnessing the reliability of photoperiod regulation over other, more labile signaling pathways could be used as a robust breeding tool to enhance plants against the harmful effects of climate change.

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“…age and hormone) signals that are integrated at the shoot apical meristem (SAM) throughout the lifetime of the plant. In the non-equatorial tropics, shortening photoperiods signal that the rainy season or monsoon is coming to an end, resulting in flowering of short-day grasses (Poaceae) such as rice ( Oryza sativa ) and maize ( Zea mays ) at the end of the greening period, prior to the extreme heat of summer ( Naranjo et al , 2014 ; Mascheretti et al , 2015 ; Preston and Fjellheim, 2020 ). In contrast, lengthening photoperiods during the impending warm season of temperate regions trigger flowering in long-day plants such as the grasses wheat ( Triticum aestivum ) and barley ( Hordeum vulgare ), circumventing the negative effects of winter freezing ( Nishida et al , 2013 ; Chen et al , 2014 ).…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, lengthening photoperiods during the impending warm season of temperate regions trigger flowering in long-day plants such as the grasses wheat ( Triticum aestivum ) and barley ( Hordeum vulgare ), circumventing the negative effects of winter freezing ( Nishida et al , 2013 ; Chen et al , 2014 ). Photoperiodicity in flowering is thus a good predictor of current plant distributions ( Zhang et al , 2015 ; Preston and Fjellheim, 2020 ), but the evolutionary genetic basis of switches between long- and short-day responses is not well understood.…”

Section: Introductionmentioning

confidence: 99%

Major niche transitions in Pooideae correlate with variation in photoperiodic flowering and evolution of CCT domain genes

Fjellheim

Young

Paliocha

et al. 2022

Journal of Experimental Botany

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The external cues that trigger timely flowering vary greatly across tropical and temperate plant taxa, the latter relying on predictable seasonal fluctuations in temperature and photoperiod. In the grass family (Poaceae) for example, species of the subfamily Pooideae have become specialists of the northern temperate hemisphere, setting up the hypothesis that their progenitor evolved a flowering response to long-days from a short-day or day-neutral ancestor. Sampling across the Pooideae, we found support for this hypothesis, and identified several secondary shifts to day-neutral flowering and one to short-day flowering in a tropical highland clade. To explain the proximate mechanisms for the secondary transition back to short-day-regulated flowering, we investigated the expression of CCT domain genes, some of which are known to repress flowering in cereal grasses under specific photoperiods. We found a shift in CONSTANS 1 and CONSTANS 9 expression that coincides with the derived short-day photoperiodism of our exemplar species Nassella pubiflora. This sets up the testable hypothesis that trans- or cis-regulatory elements of these CCT domain genes were the targets of selection for major niche shifts in Pooideae grasses.

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Understanding Past, and Predicting Future, Niche Transitions based on Grass Flowering Time Variation

Abstract: Major grass clades show strong conservation in how their flowering time is controlled, despite apparently low evolutionary constraints at the genetic level, and a dearth of data for tropical taxa

Cited by 18 publications

References 196 publications

MADS1 maintains barley spike morphology at high ambient temperatures

MADS1 maintains barley spike morphology at high ambient temperatures

Photoperiodic Signaling and Senescence, an Ancient Solution to a Modern Problem?

Major niche transitions in Pooideae correlate with variation in photoperiodic flowering and evolution of CCT domain genes

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