Chemical Signal as a Rapid Long-Distance Information Messenger After Local Wounding of a Plant?

Hlaváčková, Vladimíra; Nauš, Jan

doi:10.4161/psb.2.2.3616

Cited by 12 publications

(9 citation statements)

References 31 publications

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“…In our previous studies, we observed that fast electrical signal (induced by a propagating hydraulic signal through activation of mechano‐sensitive stretch‐activated channels) may trigger systemic stomatal and photosynthetic responses of tobacco plants and short‐term chemical defense‐related (accumulation of ABA and jasmonic acid (JA)) signaling pathways in tobacco (Hlaváčková et al 2006; Hlaváčková and Nauš 2007). Chloroplast movement is closely linked to photosynthetic efficiency.…”

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confidence: 99%

Is Chloroplast Movement in Tobacco Plants Influenced Systemically after Local Illumination or Burning Stress?

Nauš

Rolencová

Hlaváčková

2008

JIPB

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Chloroplast movement has been studied in many plants mainly in relation to the local light, mechanical or stress effects. Here we investigated possible systemic responses of chloroplast movement to local light or burning stress in tobacco plants (Nicotiana tabacum cv. Samsun). Chloroplast movement was measured using two independent methods: one with a SPAD 502 Chlorophyll meter and another by collimated transmittance at a selected wavelength (676 nm). A sensitive periodic movement of chloroplasts was used in high or low (2 000 or 50 μmol/m 2 per s photosynthetically active radiation, respectively) cold white light with periods of 50 or 130 min. Measurements were carried out in the irradiated area, in the non-irradiated area of the same leaf or in the leaf located on the stem below the irradiated or burned one. No significant changes in systemic chloroplast movement in non-irradiated parts of the leaf and in the non-treated leaf were detected. Our data indicate that chloroplast movement in tobacco is dependent dominantly on the intensity and spectral composition of the incident light and on the local stimulation and state of the target tissue. No systemic signal was strong enough to evoke a detectable systemic response in chloroplast movement in distant untreated tissues of tobacco plants.Key words: burning; chloroplast movement; irradiance; systemic response; tobacco. Higher plants respond to changing environmental factors affecting either the whole plants (changing temperature, water deficit, excess light intensity) or the part (local response) of a plant body (wounding) by initiating various defense-related processes. These processes include, for example, the accumulation of defense-related proteins, changes in respiration, stomatal and photosynthetic apparatus responses and also chloroplast movement. Important characteristics of self-defense responses of plants are their velocity and ubiquity. Fast (minutes to hours) responses to injurious factors have been detected in the site of injury and in distant regions (systemic response) at the tissue, cellular and molecular levels in various plants (Herde et al. 1996;Baldwin et al. 1997;Rakwal et al. 2002;Koziolek et al. 2004;Hlaváčková et al. 2006 suggest that a signal moves from the injured tissue to the distant untreated parts of the plants and leads to systemic changes. Precise control of organelle positioning is important for plant responses at the cellular level to environmental conditions and stresses (Nagai 1993;Wada and Suetsugu 2004). In particular, chloroplast photo-movement is one of the responses observed in the cells of many species (including tobacco plants used in our study, Augustynowicz et al. 2001) and occurs throughout the plant kingdom . Chloroplasts move towards the illuminated area under weak light conditions, whereas they move away from the area when the light is too strong. The accepted interpretation of the ecological role of these responses is to optimize light harvesting for photosynthesis. Kasahara et al. (2002) reported that chl...

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confidence: 99%

Is Chloroplast Movement in Tobacco Plants Influenced Systemically after Local Illumination or Burning Stress?

Nauš

Rolencová

Hlaváčková

2008

JIPB

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“…used stressor for inducing VP in a wide variety of plants, including barley, 37 faba bean, 37 soybean, 38 tobacco, 39 sunflower, 40 mimosa, 11,41,42 tomato, 6,43 Bidens pilosa, 44,45 pumpkin, 11,46 wheat, 47 and pea. 26,30,31 Mechanical injury also can induce VP.…”

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confidence: 99%

Variation potential in higher plants: Mechanisms of generation and propagation

Vodeneev

Akinchits

Sukhov

2015

Plant Signaling & Behavior

102

158

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“…Stahlberg and Cosgrove () rejected the chemical agent hypothesis as their experiments using only pressure steps could recapitulate VPs without wounding and therefore excluded a wounding substance being present. However, a hormone such as jasmonate may either already be present or could be quickly synthesized (Hlavackova and Nauš, ; Mousavi et al ., ; Farmer et al ., ), and may not require wounding per se . During wounding, ions and chemicals stored within the vacuole could be released into the surrounding tissue and the vasculature, when the cell is damaged (Malone, ).…”

Section: Discussionmentioning

confidence: 99%

Chemical agents transported by xylem mass flow propagate variation potentials

Evans

Morris

2017

The Plant Journal

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SummaryLong‐distance signalling is important for coordinating plant responses to the environment. Variation potentials (VPs) are a type of long‐distance electrical signal that are generated in plants in response to wounding or flaming. Unlike self‐propagating action potentials, VPs can be measured beyond regions of dead or chemically treated tissue that block signal generation, suggesting a different mode of propagation. Two alternative propagation mechanisms have been proposed: movement of a chemical agent and a pressure wave through the vasculature. Variants of these two signalling mechanisms have been suggested. Here, we use simple models of the underlying physical processes to evaluate and compare these predictions against independent data. Our models suggest that chemical diffusion and pressure waves are unlikely to capture existing data with parameters that are known from other sources. The previously discarded hypothesis of mass flow in the xylem transporting a chemical agent, however, is able to reproduce experimental propagation speeds for VPs. We therefore suggest that chemical agents transported by mass flow within the xylem are more likely than a pressure wave or chemical diffusion as a VP propagation mechanism. Understanding this mode of long‐distance signalling within plants is important for unravelling how plants coordinate physiological responses via cell‐to‐cell communication.

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Chemical Signal as a Rapid Long-Distance Information Messenger After Local Wounding of a Plant?

Cited by 12 publications

References 31 publications

Is Chloroplast Movement in Tobacco Plants Influenced Systemically after Local Illumination or Burning Stress?

Is Chloroplast Movement in Tobacco Plants Influenced Systemically after Local Illumination or Burning Stress?

Variation potential in higher plants: Mechanisms of generation and propagation

Chemical agents transported by xylem mass flow propagate variation potentials

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