ISSN: 0973-7510

E-ISSN: 2581-690X

Research Article | Open Access

Ahmed Mohamed Aly Khalil1,2 and Amr Hosny Hashem2

1Biology Department, College of Science, Taibah University, Yanbu, Postal code 41911, KSA.
2Botany and Microbiology Department, Faculty of Science, Al-Azhar University, Cairo – 13759, Egypt.
J Pure Appl Microbiol. 2018;12(4):2041-2048 | Article Number: 5321
Received: 19/10/2018 | Accepted: 25/11/2018 | Published: 30/12/2018
Abstract

Identification of aspergilli based on comparative of their diagnostic features in different growth media is a common manner between most of mycologists. Asexual sporulation in Aspergillus species is very complex processes which include numerous morphologically distinct stages. In the present study, asexual reproductive structures of Aspergillus terreus and Aspergillus versicolor have been tracked and the development of conidiophores have been compared in two types of growth media MEA (Malt Extract Agar) and YES (Yeast Extract Sucrose) which considered the most common growth media in identification of aspergilli. Interestingly, YES agar medium induce A. terreus to retard the asexual sporulation process in a distinctive manner. Unusually, the early conidiophore of A. terreus distends to form infertile (immature) vesicle which then produces a second conidiophore. The later conidiophore expands to form fertile (mature) vesicle which differentiates into conidial head. The development of one or more conidiophores from the immature vesicles of A. terreus instead the foot cells or areal hyphae remain mostly uncharacterized by many researchers. On the other hand, the asexual sporulation in both Aspergillus species was dramatically decreased on YES agar medium when compared by MEA medium. Moreover, the accessory conidia in A. terreus and reduced Penicillium-like structures that produce another type of phialedic conidia in A. versicolor were mostly not observed on YES agar medium.

Keywords

A. terreus, A. versicolor, asexual sporulation, scanning electron microscope

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