A monopodial rosette model of shoot formation as a program of secondary-aquatic grasses appearing

Natalya Savinykh,Svetlana Shabalkina

doi:10.1051/bioconf/20213800109

Abstract

On the basis of comparative morphological analysis of the structure of life forms the concept “key biomorph” is offered; it is a mien of a plant which reflects adaptation to the conditions of a definite habitat (a static aspect, a model) and a definite stage in evolutional changes of biomorphs (a dynamical / evolutional aspect). The paper shows a comparative morphological range of key biomorphs in accordance with a monopodial rosette model of shoot formation per gradient of moisture increase in the direction: a floodplain meadow – shores, shore fronts – the water line – a water body. Polygonum bistorta is considered the original key biomorph, changes in it could occur in three lines: 1) Polygonum bistorta – Butomus umbellatus – Nuphar lutea; 2) Polygonum bistorta – Scirpus lacustris – Eleocharis palustris; 3) Polygonum bistorta – Limosella aquatica – Stratiotes aloides. It seems that appearing of secondary-aquatic grasses with a monopodial rosette model of shoot formation was provided by the following modes of morphological evolution: deviation on the shoot level; abbreviation of the bud stage in shoot formation, in forming a part of the shoot (inflorescence), in the anatomic structure of the shoot and the ontogenesis of the original plant; prolongation of the bud phase in shoot development and ontogenesis of the genet.

Highlights

The look of the plant is mostly determined by the system of shoot formation
Serebryakov that a life form demonstrates adaptation to the contemporary conditions of the environment, and to the former ones [1], including the conditions of habitats with constantly changing degree of watering of the substrate, we offer the concept of “key biomorph” which is a mien of a plant which reflects adaptation to the conditions of a definite habitat and a definite stage in evolutional changes of biomorphs [2]
This paper considers possible changes in biomorphs with a monopodial rosette model which appear per gradient of moisture increase: a floodplain meadow – shores, shore fronts – the water line – a water body

Summary

Introduction

The look of the plant is mostly determined by the system of shoot formation. Shoot systems provide the most precise reaction of an organism to the peculiarities of the environment and to its adjustment to it. G. Serebryakov that a life form demonstrates adaptation to the contemporary conditions of the environment, and to the former ones [1], including the conditions of habitats with constantly changing degree of watering of the substrate, we offer the concept of “key biomorph” which is a mien of a plant which reflects adaptation to the conditions of a definite habitat (a static aspect, a model) and a definite stage in evolutional changes of biomorphs (a dynamical / evolutional aspect) [2]. Not to mix the concept with peculiarities of a definite species, the name of a key biomorph is not written in italics (for example, Polygonum bistorta)

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