Plants as Mechano-Osmotic Transducers

Hejnowicz, Z.

doi:10.1007/978-3-642-19091-9_10

Cited by 13 publications

(9 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2c). It seems that invaginations may also be formed as ingrowths of cell walls, similar to that of mesophyll cells of Pinus sylvestris L. needle (Hoss and Wernicke 1995; Hejnowicz 2011). It may be true for cells of young leaf epidermis, with not yet wavy anticlinal walls, which have several short invaginations that do not contact any gap or cell loss site (C1 in Fig.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Defects in leaf epidermis of Arabidopsis thaliana plants with CDKA;1 activity reduced in the shoot apical meristem

et al. 2012

View full text Add to dashboard Cite

In Arabidopsis thaliana, like in other dicots, the shoot epidermis originates from protodermis, the outermost cell layer of shoot apical meristem. We examined leaf epidermis in transgenic A. thaliana plants in which CDKA;1.N146, a negative dominant allele of A-type cyclin-dependent kinase, was expressed from the SHOOTMERISTEMLESS promoter, i.e., in the shoot apical meristem. Using cleared whole mount preparations of expanding leaves and sequential in vivo replicas of expanding leaf surface, we show that dominant-negative CDKA;1 expression results in defects in epidermis continuity: loss of individual cells and occurrence of gaps between anticlinal walls of neighboring pavement cells. Another striking feature is ingrowth-like invaginations of anticlinal cell walls of pavement cells. Their formation is related to various processes: expansion of cells surrounding the sites of cell loss, defected cytokinesis, and presumably also, the actual ingrowth of an anticlinal cell wall. The mutant exhibits also increased variation in cell size and locally reduced waviness of anticlinal walls of pavement cells. These unusual features of leaf epidermis phenotype may shed a new light on our knowledge on morphogenesis of jigsaw puzzle-shaped pavement cells and on the CDKA;1 role in regulation of plant development via influence on cytoskeleton and plant cell wall.

show abstract

Section: Resultsmentioning

confidence: 99%

“…1g), the mechanism leading to formation of waviness of double anticlinal walls that are walls at contact of two cells (Panteris and Galatis 2005; Kotzer and Wasteneys 2006; Hejnowicz 2011) operates also in case of such ingrowth-like invaginations formed by an individual cell wall.…”

Section: Resultsmentioning

confidence: 99%

Defects in leaf epidermis of Arabidopsis thaliana plants with CDKA;1 activity reduced in the shoot apical meristem

et al. 2012

View full text Add to dashboard Cite

show abstract

“…Directed division and growth of cells play a major role in the development of callus tissue and cell ordering processes (Fahn 1990;Hejnowicz 2002). Some authors state that these processes may be related to mechanical stresses that can occur due to interactions between cells in developing tissues and organs (Brown & Sax 1962;Brown 1964;Makino et al 1983;Dumais 2007;Hejnowicz 2011). the importance of this factor in morphogenetic processes in regenerating tissue of woody plants may still be questioned due to insufficient experimental evidence on mechanical stresses within a developing tissue.…”

Section: Discussionmentioning

confidence: 99%

Ordering of the cellular arrangement and xylogenesis in wounded shoots of willow

Zajączkowska

2015

IAWA J

View full text Add to dashboard Cite

Development of living organisms is characterized by self-organization, which results in ordered cell and tissue patterns. Xylem formation in callus tissue may serve as a model to study these phenomena. Applying auxin on the apical transverse cut surface of willow shoot segments stimulates the proliferation of callus with an unorganized cell arrangement. In some areas of callus, the cells form an ordered system and partly differentiate into tracheary elements. Below the cut surface a zone of initially unorganized parenchymatous cells is produced by the cambium. Later, some of the cells formed ordered arrangements giving rise to differentiation in xylem rays with a subsequent layer of normal wood. Digital image processing software based on a structure tensor revealed a more coherent orientation of the cellular pattern in the callus region close to the cambial zone in the cut shoot surface, compared with the areas at further distances near the outer parts of the callus ring. Differentiation of tracheary xylem elements occurs mostly in the regions where a higher degree of cellular ordering in parenchyma tissue is observed. Digital image analysis is a useful tool for the quantitative estimation of subtle changes of cellular ordering in various regions of regenerating tissue. Wider application of this tool may open new opportunities in studies of the complex mechanisms that control morphogenetic patterns in plants.

show abstract

“…In herbaceous plants, tissue stress (TS) is a result of the interactions between anatomical structures, mainly cell walls, and physiological processes related to the osmotic conditions of the cell. TS is an important element that keeps the tissues, organs, and entire body at high level of potential energy (Niklas 1992 ; Hejnowicz 2011 ). Due to the existence of TS and the state of pre-stress, the amount of energy necessary for plant movement reactions can be lowered (Hejnowicz 1997 ; Spatz et al 1999 ; Elices 2000 ; Vincent 2012 ).…”

Section: Introductionmentioning

confidence: 99%

Are trichomes involved in the biomechanical systems of Cucurbita leaf petioles?

Zajączkowska

Kucharski

Guzek

2015

Planta

View full text Add to dashboard Cite

Main conclusionTrichomes are involved in petiole movement and likely function as a part of the plant biomechanical system serving as an additional reservoir of hydrostatic pressure.The large, non-glandular trichomes on Cucurbita petioles occur across collenchyma strands. Time-lapse imaging was used to study the leaf reorientation of Cucurbita maxima ‘Bambino’ plants placed in horizontal position. The experiment comprised four variants of the large non-glandular petiole trichomes: (1) intact, (2) mechanically removed, (3) dehydrated, and (4) intact but with longitudinally injured petioles. Isolated strands of collenchyma with intact epidermis or epidermis mechanically removed from the abaxial and adaxial sides of the petiole were subjected to breaking test. The stiffness of the non-isolated tissue with intact epidermis was measured using the micro-indentation method. Petioles without trichomes did not exhibit tropic response, and the dehydration of trichomes slowed and prevented complete leaf reorientation. Isolated strands of collenchyma showed no correlation between strength values and position on the petiole. However, strands of collenchyma with epidermis exhibited a significantly greater strength regardless of their position on the petiole. The indentation test showed that non-isolated collenchyma is stiffer on the abaxial side of the petiole. Trichomes from the abaxial side of the petiole were larger at their base. The application of the ‘tensile triangles method’ revealed that these trichomes had a biomechanically optimized shape in comparison to the adaxial side. We conclude that trichomes can be involved in plant biomechanical system and serve as an additional reservoir of hydrostatic pressure that is necessary for maintaining petioles in the prestressed state.Electronic supplementary materialThe online version of this article (doi:10.1007/s00425-015-2388-z) contains supplementary material, which is available to authorized users.

show abstract

Plants as Mechano-Osmotic Transducers

Cited by 13 publications

References 61 publications

Defects in leaf epidermis of Arabidopsis thaliana plants with CDKA;1 activity reduced in the shoot apical meristem

Defects in leaf epidermis of Arabidopsis thaliana plants with CDKA;1 activity reduced in the shoot apical meristem

Ordering of the cellular arrangement and xylogenesis in wounded shoots of willow

Are trichomes involved in the biomechanical systems of Cucurbita leaf petioles?

Contact Info

Product

Resources

About