Jasmonate action in plant growth and development

Huang, Huang; Liu, Bei; Liu, Liangyu; Song, Susheng

doi:10.1093/jxb/erw495

Cited by 491 publications

(357 citation statements)

References 131 publications

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“…JA has been associated with both wounding (Koo & Howe, 2009) and mechanical stimulation in various species (Chehab et al, 2009). The growth of wildtype Arabidopsis is suppressed by touching, but JA deficient mutants do not show this response (Chehab, Yao, Henderson, Kim, & Braam, 2012), which is consistent with the general growth inhibiting action of this hormone (Huang, Liu, Liu, & Song, 2017). However, JA promoted the growth of sorghum buds, a surprising finding given its more typical inhibitory effects.…”

Section: Bud Responses To Leaf Contact Force Involve Aba and Jamentioning

confidence: 76%

“…However, JA promoted the growth of sorghum buds, a surprising finding given its more typical inhibitory effects. JA promotes stamen development, trichome formation, and tuber formation, providing some precedent for growth stimulatory action (Huang et al, ). JA also contributes to Arabidopsis lateral root development by stimulating IAA accumulation in the root (Sun et al, ).…”

Section: Discussionmentioning

confidence: 99%

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Sorghum tiller bud growth is repressed by contact with the overlying leaf

Liu

Finlayson

2019

Plant Cell & Environment

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Basal branching in grasses, or tillering, is an important trait determining both form and function of crops. Although similarities exist between eudicot and grass branching programs, one notable difference is that the tiller buds of grasses are covered by the subtending leaf, whereas eudicot buds are typically unconstrained. The current study shows that contact with the leaf sheath represses sorghum bud growth by providing a mechanical signal that cues the bud to refrain from rapid growth. Leaf removal resulted in massive reprogramming of the bud transcriptome that included signatures of epigenetic modifications and also implicated several hormones in the response. Bud abscisic acid transiently increased, then decreased following leaf removal relative to controls, and abscisic acid was necessary to repress bud growth in the presence of the leaf. Jasmonic acid (JA) levels and signalling increased in buds following leaf removal. Remarkably, application of JA to buds in situ promoted growth. The repression of bud growth by leaf contact shares characteristics of thigmomorphogenic responses in other systems, including the involvement of JA, though the JA effect is opposite. The repression of bud growth by leaf contact may represent a mechanism to time tillering to an appropriate developmental stage of the plant.

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Section: Bud Responses To Leaf Contact Force Involve Aba and Jamentioning

confidence: 76%

Section: Discussionmentioning

confidence: 99%

Sorghum tiller bud growth is repressed by contact with the overlying leaf

Liu

Finlayson

2019

Plant Cell & Environment

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“…Jasmonate (JA) is a major defense hormone in plants. In addition to its vital role in protecting plants against necrotrophic fungi and herbivores, JA regulates a variety of plant growth and developmental processes (Yan and Xie, 2015;Huang et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Jasmonate inhibits COP1 activity to suppress hypocotyl elongation and promote cotyledon opening in etiolated Arabidopsis seedlings

Zheng

Cui

et al. 2017

The Plant Journal

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A germinating seedling undergoes skotomorphogenesis to emerge from the soil and reach for light. During this phase, the cotyledons are closed, and the hypocotyl elongates. Upon exposure to light, the seedling rapidly switches to photomorphogenesis by opening its cotyledons and suppressing hypocotyl elongation. The E3 ubiquitin ligase CONSTITUTIVE PHOTOMORPHOGENIC 1 (COP1) is critical for maintaining skotomorphogenesis. Here, we report that jasmonate (JA) suppresses hypocotyl elongation and stimulates cotyledon opening in etiolated seedlings, partially phenocopying cop1 mutants in the dark. We also find that JA stabilizes several COP1-targeted transcription factors in a COP1-dependent manner. RNA-seq analysis further defines a JA-light co-modulated and cop1-dependent transcriptome, which is enriched for auxin-responsive genes and genes participating in cell wall modification. JA suppresses COP1 activity through at least two distinct mechanisms: decreasing COP1 protein accumulation in the nucleus; and reducing the physical interaction between COP1 and its activator, SUPPRESSOR OF PHYTOCHROME A-105 1 (SPA1). Our work reveals that JA suppresses COP1 activity to stabilize COP1 targets, thereby inhibiting hypocotyl elongation and stimulating cotyledon unfolding in etiolated Arabidopsis seedlings.

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“…Although our experiment is consistent with this plausible mechanism by which herbivores can facilitate bacterial growth within plants, it does not identify the proximal mechanism(s) responsible for these effects. JA-induced defenses may have instead stressed the plants, decreasing basal tolerance to infection, or shunted resources towards investments which reduce the ability of plants to resist or tolerate bacterial infection (41). Under field conditions, herbivore attack may cause direct costs via loss of plant tissue as well as indirect costs associated with mounting an anti-herbivore defense response, and such resource constraints may also decrease tolerance to both herbivores and bacterial colonizers.…”

Section: Herbivore-inducible Plant Defenses Can Amplify Phytopathogensmentioning

confidence: 99%

Insect herbivory reshapes a native leaf microbiome

Humphrey

Whiteman

2019

Preprint

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Insect herbivory is pervasive in plant communities, but its impact on microbial plant colonizers is not well-studied in natural systems. By calibrating sequencing-based bacterial detection to absolute bacterial load, we find that the within-host abundance of most leaf microbiome (phyllosphere) taxa colonizing a native forb is amplified within leaves impacted by insect herbivory. Herbivore-associated bacterial amplification reflects community-wide compositional shifts towards lower ecological diversity, but the extent and direction of such compositional shifts can be interpreted only by quantifying absolute abundance. Experimentally eliciting anti-herbivore defenses reshaped within-host fitness ranks among Pseudomonas spp. field isolates and amplified a subset of putative P. syringae phytopathogens in a manner causally consistent with observed field-scale patterns. Herbivore damage was inversely correlated with plant reproductive success and was highly clustered across plants, which predicts tight co-clustering with putative phytopathogens across hosts. Insect herbivory may thus drive the epidemiology of plant-infecting bacteria as well as the structure of a native plant microbiome by generating variation in within-host bacterial fitness at multiple phylogenetic and spatial scales. This study emphasizes that "non-focal" biotic interactions between hosts and other organisms in their ecological settings can be crucial drivers of the population and community dynamics of host-associated microbiomes.Introduction 1 For many organisms, attack by multiple enemies is inevitable and often occurs sequentially during the 2 lifetime of individual hosts. Prior attack can alter host phenotypes and change how future attacks unfold, 3 often generating cascading effects at larger spatial and temporal scales 1-4 . Given the large effects of 4 co-infection on host health and the population dynamics of their parasites, explicitly studying co-infection 5 is becoming increasingly common 4-6 . But rarely has this perspective been extended to studies of diverse 6 host-associated microbial communities ('microbiomes'). Instead, microbiome studies tend to focus on 7 effects of host genotype or abiotic variation on microbiome diversity patterns 7-11 . This has left a major 8 gap in our understanding of how host colonization from non-microbial enemies impacts the population 9 biology of microbiome-associated taxa. 10For plants, there is tremendous interest in understanding the structure and function of the 11 microbiome both for applied purposes, such as engineering growth promotion and disease resistance 12,13 , 12 and as model systems for host-microbial symbioses more generally. Insect herbivory represents a pervasive 13 threat to plants in both native and agricultural settings 14 . Herbivory alters plant phenotypes through 14 tissue damage and induction of plant defenses, which can change susceptibility of plants to attack by 15 insects 15 as well as microbes 16,17 . Thus, factors that influence the impact of herbivores on hosts will ...

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Jasmonate action in plant growth and development

Cited by 491 publications

References 131 publications

Sorghum tiller bud growth is repressed by contact with the overlying leaf

Sorghum tiller bud growth is repressed by contact with the overlying leaf

Jasmonate inhibits COP1 activity to suppress hypocotyl elongation and promote cotyledon opening in etiolated Arabidopsis seedlings

Insect herbivory reshapes a native leaf microbiome

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