Direct exposure to solar radiation causes radial growth eccentricity at the beginning of the growing season in Robinia pseudoacacia

Miodek, Adam; Gizińska, Aldona; Klisz, Marcin; Wojda, Tomasz; Ukalski, K.; Kojs, Paweł

doi:10.1163/22941932-00002106

Cited by 7 publications

(4 citation statements)

References 55 publications

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“…According to this concept radial tensile stress in the cambium would change to compressive stress later in the growing season (Hejnowicz, 1997 ; Kwiatkowska & Nakielski, 2011 ). However, the study of Robinia pseudoacacia xylogenesis (Miodek et al ., 2020 ) revealed that the phloem within the stem seems to collapse much too early to explain the growth of first broad vessel elements of earlywood (Fig. 6 ) – phloem showed a reduced radial dimension in March, compared to the radial dimension observed in August of the previous year.…”

Section: Mechanical Conditions In the Vascular Cambium And Developing...mentioning

confidence: 98%

What do we know about growth of vessel elements of secondary xylem in woody plants?

et al. 2021

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Despite extensive knowledge about vessel element growth and the determination of the axial course of vessels, these processes are still not fully understood. They are usually explained as resulting primarily from hormonal regulation in stems. This review focuses on an increasingly discussed aspect – mechanical conditions in the vascular cambium. Mechanical conditions in cambial tissue are important for the growth of vessel elements, as well as other cambial derivatives. In relation to the type of stress acting on cambial cells (compressive versus tensile stress) we: (i) discuss the shape of the enlarging vessel elements observed in anatomical sections; (ii) present hypotheses regarding the location of intrusive growth of vessel elements and cambial initials; (iii) explain the relationship between the growth of vessel elements and fibres; and (iv) consider the effect of mechanical stress in determining the course of a vessel. We also highlight the relationship between mechanical stress and transport of the most extensively studied plant hormone – auxin. We conclude that the integration of a biomechanical factor with the commonly acknowledged hormonal regulation could significantly enhance the analysis of the formation of vessel elements as well as entire vessels, which transport water and minerals in numerous plant species.

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Section: Mechanical Conditions In the Vascular Cambium And Developing...mentioning

confidence: 98%

What do we know about growth of vessel elements of secondary xylem in woody plants?

et al. 2021

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“…Due to the highly ordered arrangement of its components, such structure allows for precise anatomical analysis of the course of intrusive growth of initials and wood fibres 37 . Key factor taken into account while choosing this species as the main object of the study was its growing economic importance outside the area of natural distribution 31 , 38 due to its high adaptive potential, especially in the context of emerging environmental threats.…”

Section: Methodsmentioning

confidence: 99%

“…Due to (1) the newly proposed role of symplastic growth in mathematical modelling of expansion of cambial circumference, and (2) the fact that previously mentioned studies challenging a wide-spread view that intrusive growth leads to an increase in cambial circumference were of qualitative type, a quantitative analysis of influence of intrusive growth on tangential dimension of fragment of tissue within which cambial rearrangement takes place is necessary. The main goal of this study is to further elucidate, both quantitatively and qualitatively, the mechanism of intrusive growth of cambial initial cells on the example of Robinia pseudoacacia L.—a tree species of growing economic potential in Europe 31 . It is also one of the most highly invasive alien species threatening biodiversity, which, given the anticipated climate changes, may become an increasing ecological and economic problem 32 – 35 .…”

Section: Introductionmentioning

confidence: 99%

Intrusive growth of initials does not affect cambial circumference in Robinia pseudoacacia

Miodek

Gizińska

Włoch

et al. 2022

Sci Rep

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This study aimed to test the hypothesis whether intrusive growth of initial cells is related to the increase in circumference of Robinia pseudoacacia vascular cambium—both qualitatively and quantitatively. The mode of intrusive growth of cambial initial cells was also studied. Samples collected from tree trunks were examined using series of semi-thin transverse sections. Anatomical reconstructions of radial and tangential planes of analysed fragments of cambial tissue were made. Observations and measurements have shown that the intrusive growth of R. pseudoacacia initial cells does not contribute to an increase in tangential dimension of observed tissue fragments where cell rearrangement occurs. Moreover, initially separated tangential walls of cells (between which cambial initial cell elongates intrusively) are transformed into obliquely oriented walls. These results stand in accordance with a statement that only symplastic growth of initials, not intrusive growth, is responsible for the increase in circumference in all woody plants with the continuous cambial cylinder. Moreover, we managed to capture the moment of transition of initial status from one cell to another for the first time. This phenomenon may be explained on the basis of the system of mechanical stresses operating not only in the secondary meristematic tissue but also in a whole plant organism.

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“…The study was performed on black locust (Robinia pseudoacacia L.)-a deciduous, ring-porous species (Miodek et al 2020). Examined tree with a circumference of ca.…”

Section: Plant Materialsmentioning

confidence: 99%

Contribution of intrusive and symplastic growths in wood fibre tip development

Miodek

Gizińska

Kojs

2022

Trees

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Key message At initial stages of fibre development, radial enlargement of growing fibre tip is achieved, on average, in 37.8% intrusively and in 62.2% symplastically, whereas tip tangential enlargement is purely intrusive. Abstract In this study, we have investigated the mode of growth of black locust wood fibre tips at initial stages of their development using detailed measurements. Growth of fibre tips may be considered in three directions: axial, tangential, and radial. An axial elongation of a fibre tip was described as intrusive and related to the separation of walls of neighbouring cells. However, determination of the contribution of intrusive vs. symplastic component of growth in tangential and radial directions was missing. Semi-thin transverse sections of the vascular cambium and adjacent tissues were obtained by ultramicrotome and stained with PAS and toluidine blue. An anatomical analysis of contribution of intrusive and symplastic growths in fibre tip radial and tangential enlargement was performed. Our study showed that during its development an average wood fibre tip grows only intrusively in tangential direction and shows intrusive-symplastic growth in radial direction. On average, at initial stages of its development, a fibre tip radial enlargement is achieved in 37.8% by intrusive growth and in 62.2% by coordinated (symplastic) growth.

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Direct exposure to solar radiation causes radial growth eccentricity at the beginning of the growing season in Robinia pseudoacacia

Cited by 7 publications

References 55 publications

What do we know about growth of vessel elements of secondary xylem in woody plants?

What do we know about growth of vessel elements of secondary xylem in woody plants?

Intrusive growth of initials does not affect cambial circumference in Robinia pseudoacacia

Contribution of intrusive and symplastic growths in wood fibre tip development

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