Life in a changing world: TCH gene regulation of expression and responses to environmental signals

Braam, Janet; Sistrunk, Melissa L.; Polisensky, Diana H.; Wang, Xu; Purugganan, Mary M.; Antosiewicz, Danuta Maria; Campbell, Paul; Johnson, Keith A.

doi:10.1034/j.1399-3054.1996.980432.x

Cited by 11 publications

(10 citation statements)

References 25 publications

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“…Nevertheless, under lateral shading, wind blowing did not influence root dry mass, leaf number or total area, indicating that the shading may override effects of wind in these aspects. This pattern of interaction could be involved in a trade‐off between mechanical stability and light resource competition and implies that responses to shade and mechanosensing in plants may share a partially overlapping signal transduction pathway (Braam, ; Braam, Sistrunk, Polisensky, et al, ; Lee, Polisensky, & Braam, ).…”

Section: Discussionmentioning

confidence: 99%

Factors influencing the distribution and growth of dwarf bamboo, Fargesia nitida, in a subalpine forest in Wolong Nature Reserve, southwest China

Wang

Tao

Zhong

2008

Ecological Research

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Dwarf bamboos impose intense resource competition in subalpine coniferous forests, and their exclusive densities have crucial impacts on tree regeneration and understory species diversity. We studied the factors influencing the distribution and growth of dwarf bamboo, Fargesia nitida, in a subalpine forest in southwest China. TWINSPAN, based on an attribute matrix, could divide the subalpine forest into 11 subassociations, and more clearly reflected ecological functional features of the subalpine forest than analysis based on a species matrix. TWINSPAN was also generally consistent with DCA ordination based on the attribute matrix. DCA and DCCA ordination showed relationships between the distribution of F. nitida population and environment factor. The first DCCA axis showed topography and disturbance gradients (except fallen trees and broken branches); the second DCCA axis showed canopy density and composition gradients.Stepwise multiple regression analyses showed that distribution (culm density and coverage) of F. nitida decreased significantly with landslide and slope aspect, and increased significantly with soil status. The light condition had positive effects on growth and size of bamboo. A stable environment in the northern slope and more broadleaved species dominating in canopy would increase the dwarf bamboo biomass. Thus, the disturbance regimes, the slope aspect and the BA of evergreen conifer trees can provide useful guidelines for the control and management of F. nitida populations, and in helping to understand the succession and regeneration of subalpine forest in this region.

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Section: Discussionmentioning

confidence: 99%

Factors influencing the distribution and growth of dwarf bamboo, Fargesia nitida, in a subalpine forest in Wolong Nature Reserve, southwest China

Wang

Tao

Zhong

2008

Ecological Research

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“…The signal transduction pathway leading to thigmomorphogenesis is not clearly understood (Braam 2005), although a number of touch genes ( TCH ) have been implicated in mechanical stress responses in Arabidopsis thaliana (Braam and Davies 1990; Braam et al 1996). For a long time there have been indications that the phytohormone ethylene plays a prominent role in thigmomorphogenesis.…”

Section: Introductionmentioning

confidence: 99%

Ethylene sensitivity affects changes in growth patterns, but not stem properties, in response to mechanical stress in tobacco

Anten

Casado-Garcia

Pierik

et al. 2006

Physiologia Plantarum

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Plant responses to mechanical stress (e.g. wind or touch) involve a suite of physiologic and developmental changes, collectively known as thigmomorphogenesis, including reductions in height increment, Young's modulus of stems, shoot growth, and seed production, and increased stem girth and root growth. A role of the phytohormone ethylene in thigmomorphogenesis has been proposed but the extent of this involvement is not entirely clear. To address this issue, wild-type (WT) and ethylene-insensitive transgenic (Tetr) tobacco (Nicotianum tabacum) plants were subjected to three levels of mechanical stress: 0, 25 and 75 daily flexures. Flexed plants produced shorter, thicker stems with a lower Young's modulus than non-flexed ones, and these responses occurred independently of genotype. This suggests that ethylene does not play a role in thigmomorphogenesis-related changes in stem characteristics in tobacco. The effect of mechanical stress on dry mass increment (growth), on the other hand, differed between the genotypes: in the WT plants, shoot growth but not root growth was reduced under mechanical stress, resulting in reduced total growth and increased root mass fractions. In the Tetr plants, neither shoot nor root growth were affected. This suggests that ethylene is involved in the inhibition of tobacco shoot growth under mechanical stress.

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“…Nevertheless, under lateral shading, wind blowing did not influence root dry mass, leaf number or total area, indicating that the shading may override effects of wind in these aspects. This pattern of interaction could be involved in a trade-off between mechanical stability and light resource competition and implies that responses to shade and mechanosensing in plants may share a partially overlapping signal transduction pathway (Braam, 2005;Braam, Sistrunk, Polisensky, et al, 1996;Lee, Polisensky, & Braam, 2005).…”

Section: Figurementioning

confidence: 99%

Interactive effects of wind and light on growth and architecture of poplar saplings

Feng

Huang

Wan

2019

Ecological Research

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To explore the interactive effects of wind and light on growth and morphogenesis, poplar saplings were subjected to two different levels of wind and light. Morphogenesis, growth, water relations and gas exchange were examined in a factorial experiment. The results showed that wind reduced both shoot height and root growth but did not affect shoot diameter or root/shoot ratio, while light promoted both shoot and root growth, and the root/shoot ratio. However, light and wind consistently increased stem taper. Wind and light reduced leaf water potential and increased stem xylem cavitation at midday. Lateral shade decreased root and stem hydraulic conductance, while wind reduced stem hydraulic conductance without influencing root hydraulic conductance. Wind and light reduced the vulnerability of poplar saplings to xylem cavitation. Lateral shade strongly reduced the CO2 assimilation rate and stomatal conductance. Wind reduced the assimilation rate at midday under full sunlight. In summary, both light and wind increased stem taper, although the two environmental factors had opposite effects on the growth of poplar saplings. Lateral shading reduced the growth of shoots and roots of poplar saplings by restricting assimilation, and light promoted greater allocation of carbon to roots than to shoots, and to a lower rather than upper portion of the stem, leading to increased root/shoot ratio and stem taper. At the sapling stage, wind reduced shoot height and root growth primarily by interrupting water balance, and also induced thigmomorphogenic responses, such as increased taper. Finally, lateral shading did not suppress the thigmomorphological responses to wind.

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Life in a changing world: TCH gene regulation of expression and responses to environmental signals

Cited by 11 publications

References 25 publications

Factors influencing the distribution and growth of dwarf bamboo, Fargesia nitida, in a subalpine forest in Wolong Nature Reserve, southwest China

Factors influencing the distribution and growth of dwarf bamboo, Fargesia nitida, in a subalpine forest in Wolong Nature Reserve, southwest China

Ethylene sensitivity affects changes in growth patterns, but not stem properties, in response to mechanical stress in tobacco

Interactive effects of wind and light on growth and architecture of poplar saplings

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