Comparative study of pollen morphology and fertility in Pyrus L. species under in situ and ex situ conditions in Greater Caucasus, Azerbaijan

Abstract

A number of negative changes are observed in the pollen of the vast majority of plants distributed in polluted areas: morphological immaturity or the observation of sterile pollen grains during pollination, a quantitative decrease in the total productivity of pollen, and a decrease in the germination capacity of the pollen tube.For this reason, pollen analysis is considered one of the most reliable and effective methods in environmental quality assessment as the main component of phytoindication. Light microscopy (LM) has been used to study the morphology and fertility characteristics of pollen grains in five species of Rosaceae Juss. (Pyrus L.) in detail. The study used pollen that was collected in the Republic of Azerbaijan. In this research were used Harley methods. The main purpose of the work was the comparative study of the quality and morphological characteristics of the pollen of Pyrus L. species in natural and cultural conditions.It were determined that underex situ conditions, it was found that the pollen productivity coefficient was the highest in Pyrus vsevolodii (86%), and the lowest in Pyrus georgica (72%), but under in situ conditions, the highest P.vsevolodii (89%) and the lowest P.georgica (72%) species were found in pollen.