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The influence of organic luminophores on competitive balance between some phytocenotic components at the ultraviolet stress (on exemplu of the agrocenosis of Zea mays L.


Author: Irina Kolomieţ
Degree:doctor of biology
Speciality: 03.00.16 - Ecology
Year:2007
Scientific adviser: Ion Dediu
doctor habilitat, Institute of Ecology and Geografy of the ASM
Institution:

Status

The thesis was presented on the 23 November, 2006
Approved by NCAA on the 18 January, 2007

Abstract

Adobe PDF document0.51 Mb / in romanian
Adobe PDF document0.55 Mb / in russian

Thesis

CZU 581.1.03:535-31

Adobe PDF document 2.29 Mb / in russian
130 pages


Keywords

agrocenosis, competition, UV stress, morphofiziological traits, ontogenetic spectrum, biodiversity, ecobiomorphic spectrum, ecocenotic spectrum, phytocenosis, Zea mays, organic luminofores

Summary

Recently UV radiation has increasing role in functioning both artifical and natural ecosystems. The prognostic models show that actions for elimination of this factor (restoration of the ozon layer) will give effect only after long time. That is why the ecological science is required now to study action of this factor and to find ways to adapt to it our economic activity. In this work it is decided to study influence of UV radiation on agrocenosis, as this type of landscape prevails now, and the traditional division into the natural zones became substantially conditional. In this connection agrocenosis consisting with sugar corn and accompanying flore (weeds) was chosen as the object of research. The action of artifical UV radiation on viability, growth and development of various components of agrocenosis and also on the competitive relations between them was studied.

In this work for the first time the protector effect of organic luminophores having absorption maximum in ultra-violet area (tetracycline, aspirine, rhyboflavine) was found. These luminophores partially or completely eliminate the negative influence of UV radiation on productivity of maize. The most effective way of processing has appeared preliminary wetting seeds in solution of luminophore before sowing. Other used ways – watering 5 week plants in solution of luminophore and setting of cut tassels in this solution – did not show so clear effect. The tendency of amplification of protector properties in the order aspirine<rhyboflavine<tetracycline was observed which correlates with shift of absorption maximum to long-wave direction. It allows put forward a hypothesis that organic luminophores can be plant protectors if their absorption maximum lay in a range of stressing radiation. The results obtained show that the of adaptation of agrarian activity to change of UV factor is quite soluble and give reasons to hope that in due course this task will be successfully solved.