The heat stress effect on pollen development and germination

Šlipogor, Vedrana (2009) The heat stress effect on pollen development and germination. Bachelor's thesis, Faculty of Science > Department of Biology.

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Abstract

Increased temperature is an important factor that has impact on the living world. In plants, temperatures can affect pollen and female reproductive organs development, pollen tube growth and fruit ripening. Plants adjust their metabolic processes, decrease the rate of normal cellular proteins’ synthesis, degrade some proteins in order to be more termotolerant to heat stress. Synthesising the set of heat shock proteins is a special plants characteristic, which allows normal cell functions in high temperatures conditions. Pollen is heat-sensitive, although it has a specific structure that protects it from harmful environment conditions. Pollen grain grows into pollen tube allowing tip growth and complex cellular regulations all the way to embrio sac. The reason for unsuccessful pollination is often abnormality of the pollen tube or failure in pollen germination on stigma. The aim of this work was to determine influence of high temperature on physiology, dynamics and molecular mechanisms of pollen germination and growth. Results of recent studies showed that percentage of pollen germination, pollen tube growth rate and successful pollination rate are decreasing under influence of increased temperature. Heat stress differently affects male and female reproductive organs. The only plant organ that does not synthesise heat shock proteins under heat stress is pollen, although there are contradictory data in the literature. There is little information available about this problem, so there should be more scientific studies which would integrate data about pollen tube germination and its molecular mechanisms, physiological responses to heat stress and expression of certain cellular and heat shock proteins.

Item Type: Thesis (Bachelor's thesis)
Supervisor: Vidaković-Cifrek, Željka
Date: 2009
Number of Pages: 34
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Silvana Šehić
Date Deposited: 19 Dec 2014 11:17
Last Modified: 19 Dec 2014 11:17
URI: http://digre.pmf.unizg.hr/id/eprint/3563

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