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16 results on '"Pautov, Anatoly"'

9. Stomatal rings: structure, functions and origin.

Author

Pautov, Anatoly, Bauer, Svetlana, Ivanova, Olga, Krylova, Elena, Yakovleva, Olga, Sapach, Yulia, and Pautova, Irina

Subjects
*STOMATA, *CELL motility, *FLOWERING of plants, *FINITE element method
Abstract

Stomatal rings are structural elements of stomata of some flowering plants, being found in various groups of eudicots. The presence of a stomatal ring on a stoma does not depend on stomatal complex types, dimensions of stomata or their density. The guard cells of these stomata lie on the subsidiary cells. The location of the outer ledges on the outer tangential walls of the guard cells and the position of the stomatal rings on the guard cell walls around the outer ledges or on the outer ledges themselves are also among the characteristic features of these stomata. To elucidate the role of the stomatal rings we applied modelling using the finite-element method. The modelling has shown that the outer ledges prevent movements of the outer tangential walls of the guard cells and stimulate movements of the inner tangential walls and the immersion of the opening stomatal pore in the epidermis. Stomatal rings can enhance this effect. They also prevent the movements of the outer ledges and the widening of the stomatal aperture between them during stoma opening. This type of stomata occurs in evergreen plants growing in diverse conditions. [ABSTRACT FROM AUTHOR]

Published
2021
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15. Leaf periderm supports longevity and functionality of crown leaves in Agathisspecies (Araucariaceae)

Author

Arbicheva, Alisa and Pautov, Anatoly

Abstract

Periderm of the leaves of two Agathisspecies was studied. Agathisleaves are long-lived and remain alive for more than 25 years. Periderm occurs regularly and can be initiated in the epidermis, mesophyll, phloem parenchyma of the leaf veins and in the ground tissue of the petiole. Periderm lies on the surface, is located in the mesophyll or splits it. Periderm structure is either typical, consisting of phellogen, multilayered phellem and phelloderm or disordered. Agathisleaves are able to form true wound periderm, which has been shown experimentally. We believe that at least some of the factors inducing periderm initiation are identical both in leaves and in stems. Mechanical tension in the tissues and cell deformation plays an essential role in the periderm initiation. Leaf tissues isolated due to the suberinization process may function as a storage site for the substances not involved in the plant metabolism or excluded from it. Periderm gives an opportunity to keep such substances away from functional tissues, which is important for evergreen plants with long-lived leaves.

Published
2018
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