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eISSN: 2469 - 2786

Bacteriology & Mycology: Open Access

Mini Review Volume 5 Issue 2

Molecular characterization and phylogenetic analysis of Colletotrichum species associated with anthracnose disease

Saleem Ahmad,1,2 Farman Ali,2,3 Muhammad Anwar,4 Abdul Raqeeb5

1Key Laboratory of Pathogenic Fungi and Mycotoxins of Fujian Province, Fujian Agriculture and Forestry University, China
2Key Laboratory of Biopesticide and Chemical Biology of Education Ministry, and School of Life Science, Fujian Agriculture and Forestry University, China
3Key Laboratory of Agroecological Processing and Safety Monitoring, Fujian Agriculture and Forestry University, China
4College of Horticulture Ornamental Plants breeding and genetics, Fujian Agriculture and Forestry University, China
5Department of Forestry and Range Management, Arid Agriculture University, Pakistan

Correspondence: Saleem Ahmad, Key Laboratory of Pathogenic Fungi and Mycotoxins of Fujian Province, Fujian Agriculture and Forestry University, China

Received: June 27, 2017 | Published: July 28, 2017

Citation: Ahmad S, Ali F, Hameed MS, et al. Molecular characterization and phylogenetic analysis of Colletotrichum species associated with anthracnose disease. J Bacteriol Mycol Open Access. 2017;5(2):263-265. DOI: 10.15406/jbmoa.2017.05.00129

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Abstract

Colletotrichum species are related with anthracnose of a wide-ranging of host plants containing cultivated and wild tropical fruits. The genetic and ecological variety of species connected with wild fruits exist poorly explored, as associated to those affiliated with pre and post harvest diseases of cultivated fruits. It is needed to re-assess the evolutionary relationships of Colletotrichum species arising in cultivated and wild fruits with prominence on their ecology and cryptic divergence containing sampling at regional and global scales. This study we will examine to analysis of sequences of nuclear ribosomal internal transcribed spacer (ITS).To observe phylogenetic associations and closeness within Colletotrichum species. Multi-locus phylogenetic analysis of strains of the Colletotrichum complex associated with anthracnose.

Keywords: colletotrichum, harvest diseases, ecological, tropical, cultivated fruits

Introduction

Colletotrichum is an important plant pathogenic genus affecting anthracnose of a widespread assortment of vegetables, fruits cereals, grasses and ornamental plants in temperate tropical and regions.1–3 Fruit production is mostly affected in both high-value crops and wild fruits in natural habitats. However, Colletotrichum species associated with wild fruits are poorly known.4,5 Colletotrichum specie was voted as the eighth most important plant pathogens in the world in a recent survey among fungal pathologists, for its perceived scientific and economic importance.6 The fruits infected by Colletotrichum have small, water-soaked, sunken, circular spots that may increase in size with age and the center of an older spot becomes blackish and develops gelatinous pink or orange spore masses.7–9 Recent studies have focused on phylogenetic re-assessments of species complexes,10 and have determined that what were previously thought to be a single species, comprise multiple distinct lineages.

For example the boninense clade (Colletotrichum boninense species complex) now comprises about 18 species,11 while the acutatum clade (C. acutatum species complex) now comprises 31 species11 and the gloeosporioides clade (C. gloeosporioides species complex) comprises more than 22 species.12 The species numbers in the major clades are likely to rise, unraveling the cryptic taxa based on multi-gene phylogenetic analyses and incorporating a large number of isolates in comprehensive collections.10 In addition to the major species complexes in Colletotrichum, several intermediate clades have studied. Epitypification of Colletotrichum gloeo sporioides,13 and subsequent use of multi-gene phylogeny have resulted in this taxon being revealed as a species complex. Colletotrichum gloeo sporioides was originally described from Citrus in Italy, thus the chosen epitope culture derived from a necrotic spot on leaves of Citrus sinensis from the same country.13 Colletotrichum gloeosporioides was previously thought to be a cosmopolitan species infecting a broad range of plant hosts including tropical fruits,14–16 tested this hypothesis by molecular and morphological characterization of Colletotrichum strains from anthracnose symptoms on tropical fruits in Laos and Thailand. Colletotrichum gloeosporioides sensu stricto was not found from any of the fruit examined in their study, however many strains from various common fruits were not assigned to any known taxa based on the five genes employe.17 studied the large subunit of the nuclear ribosomal RNA gene (LSU) and the interior tran- scribed spacer 2 of the nuclear ribosomal RNA operon (ITS- 2) of Colletotrichum separates from many hosts. For a reason that of the uniformity of the DNA sequence data they established C. orbiculare, C. lindemuthianum, C. malvarum, and C. trifolii to be unique type and recommended the name C. orbiculare in which host specific forms exist. However, formed on sequence data of the glutamine synthase gene (GS) and a 200-bp intron of the glyceraldehyde-3-phosphate dehydrogenase gene (GAPDH), DNA restriction fragment distance polymorphisms (mtDNA RFLP) Mitochondrial and vegetative compatibility as well as pathogenicity tests of a huge number of strains18 identified C. orbiculare as a species complex with, C. malvarum, C. orbiculare, C. lindemuthianum and C. trifoliias distinct species. Colletotrichum orbiculare cause anthracnose of Cucurbitaceae and is phylogenetically thoroughly related to pathogens of many additional herbaceous hosts belonging to the Asteraceae, Fabaceae and Malvaceae.19 Maximum of them are recognized for their hemibiotrophic infection plan and as destructive pathogens either of area crops or weeds. To study the phylogenetic associations of these fungi, a multilocus analysis (ITS, CHS-1 GAPDH, ACT, HIS3, TUB2, GS) of 42 strains of C. orbiculare and associated species conducted. The analysis resulted in nine clades that confirmed the four species formerly known as belonging to this species complex, C. lindemuthianum, C. malvarum, C. orbiculare and C. trifolii, and recognized four novel species from weeds, i.e. C. bidentis, C. sidae, C. spinosum and C. tebeestii. Colletotrichum gloeosporioides was earlier regarded as the first Colletotrichum species to infect species of the Proteaceae.20 Based on morphology, sequence data of the interior transcribed insertion region (ITS) and partial sequences of the Beta-tubulin gene (TUB2),21 distinguished four species of Colletotrichum (C. acutatum, C. boninense, C. crassipes, C. gloeosporioides, C. acutatum) related with diseased Proteaceae. An additional strain recognized as C. gloeosporioides based on ITS and 28S rDNA gene (LSU) sequence data was involved in the study.22

Isolation of fungi and its morphological detection and observation

Strains of Colletotrichum is collected from forest trees and different cultivated fruiting plant species i.e. pepper, apple, banana, mango etc Cultures will firstly maintain on potato dextrose agar (PDA) before the observation of colony characters and growth rates. Colony characters i.e. Colony diameter, colony size, shape, and color is record (Figure 1).

Figure 1 Symptoms of different color pepper anthracnose in the field ( Fangling Liu et al 2016).

DNA extraction and sequencing

Isolates is grown on PDA and incubated for 5days at 25°C in the dark. DNA will be extracted using the protocol as outlined,23 using the actively growing mycelia from the edge of cultures. The ITS region will be sequenced using the forward/reverse primer pair ITS5/ITS4 and then on this basis amplification and sequencing of multiple gene regions will be done. All PCR products will then be visualized on 1% agarose gel. PCR products will then be purified and sequenced (Figure 2).

Figure 2 Colonies of Colletotrichum species on PDA.

Phylogenetic analyses

It is performed either on the multi-locus alignment (ACT, CAL, GAPDH, CHS-1, GS, ITS, TUB2) using PAUP v.4.0b10,24 or using a Markov Chain Monte Carlo (MCMC) algorithm to make trees or both of the processes is applied. Sequences derived in this study were deposited in GenBank, the concatenated alignment in TreeBASE (www.treebase.org), and taxonomic novelties in MycoBank.

Acknowledgements

None.

Conflict of interest

The author declares no conflict of interest.

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