สืบค้นงานวิจัย
Towards Understanding Colletotrichum “Species Complexes” Causing Leaf Disease in Rubber
C. Bindu Roy - ไม่ระบุหน่วยงาน
ชื่อเรื่อง (EN): Towards Understanding Colletotrichum “Species Complexes” Causing Leaf Disease in Rubber
ผู้แต่ง / หัวหน้าโครงการ (EN): C. Bindu Roy
บทคัดย่อ (EN): Colletotrichum leaf diseases observed as raised spots, anthracnose and circular papery lesions on rubber leaves have been reported to be caused by Colletotrichum acutaum and C. gloeosporioides in India since 2002. Earlier, this disease was reported as a minor disease affecting nursery plants. However, during the past few years, the occurrence of this diseases has been on the increase particularly in young rubber plantations wherein dieback and extension of immaturity period of the rubber trees were noticed, making it one of the major diseases of rubber plantations. Therefore, understanding the different species involved in causing the disease is essential for developing efficient disease management strategies. Till date seventy two species of Colletotrichum are known to affect different commercially important and ornamental crops across the world. To understand the Colletotrichum “species complex”, details of the available ingternak transcribed spacer (ITS) sequences from type cultures were retrieved from GonBank and used for phylogenetic analysis. The phylogenetic tree revealed existence of nine different species complexes of which two were: C. acutatum and C.gloeosporioides. The species included within the C. acutatum complex were: C. acutatum, C. fioriniae and C. simmondsii. However, the C. gloeosporioides complex was a larger complex consisting of fifteen species: C. asianum, C. cordylinicola, C. fragariae, C. fructicola, C. gloeosporioides, C. horii, C. hymenocallidis, C. ignotum, C. jasmine-sambac, C. kahawae, C. musae, C. siamense, C. theobromicola, C. tropicale and C. xanthorrhoeae. As C. acutatum and C. gloeosporioides are already reported as the two species involved in causing Colletotrichum leaf disease in rubber, effort was taken to understand in detail about the phylogenetic relationship and the possible involvement of the different species within these two complexes. To begin with C. acutatum species complex consisting of C. fioriniae, C. acutatum and C. simmondsii was investigated. The ITS and beta-tubulin sequences of type strains of these three species were analyzed both independently as separate genes as well as in a concatenated form by including both these gene regions together in the dataset. Interestingly, C. acutatum isolate from rubber (GenBank Acc. No. AF488788; IMI383015; 2002) was found to fall within the C. simmondsii clade suggesting that the rubber C. acutatum is a C. simmondsii. Contrary to the C. acutatum complex which consisted of 3 species, the C. gloeosporioides complex contained fifteen species within the complex. The ITS sequences of the fifteen type strains along with the rubber C. gloeosporioides isolate (GenBank Acc. No. AF48877; IMI383016; 2002) was analyzed. It was observed that the C. gloeosporioides of rubber showed maximum similarity with the C. siamense and the type strain of C. gloeosporioides wad found to be with greater evolutionary distance from that of the rubber C. gloeosporioides suggesting that the rubber C. gloeosporioides is possibly a C. siamense. Results of the present phylogenetic analysis based on the sequences of two nuclear DNA regions (rDNA-ITS region and β-tubulin gene) indicate a phylogenetic framework for interpreting the evolutionary history of the Colletotrichum acutatum and C. gloeosporioides “species complexes”. With the availability of better barcode regions to distinguish pathogens at the species level, the conserved sequence information suggests that the C. acutatum of rubber is not C. acutatum but is C. simmondsii and the C. gloeosporioides of rubber is not C. gloeosporioides but is C. siamense. The phylogeny for the C. acutatum and C. gloeosporioides “species complex” presented here represents advancement in our knowledge on Colletotrichum spp. Affecting rubber and needs further detailed investigation with maximum number of both these isolates collected from rubber. The data from these loci as well as from additional loci will provide an indication about the phylogenetic framework for interpreting evolutionary history of genus. Although rDNA has been widely used in hylogenetic studies, it was found that the evolution of one gene may not represent the evolution of the entire genome. Therefore, efforts are in progress to separately sample as many additional independent genes as possible and compare the phylogenies derived from these genes to see whether they support or contradict each other to systematically characterize and understand the Colletotrichum “species complex” existing in rubber.
บทคัดย่อ: ไม่พบข้อมูลจากหน่วยงานต้นทาง
ภาษา (EN): en
เผยแพร่โดย (EN): การยางแห่งประเทศไทย
คำสำคัญ (EN): Colletotrichum “species complex”
เจ้าของลิขสิทธิ์ (EN): การยางแห่งประเทศไทย
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Towards Understanding Colletotrichum “Species Complexes” Causing Leaf Disease in Rubber
C. Bindu Roy
การยางแห่งประเทศไทย
ไม่ระบุวันที่เผยแพร่
STUDY ON THE POTENCY OF SERRATIA BACTERIA USED TO CONTROL WHITE ROOT DISEASE IN RUBBER Generation of Tranceriptome Recources in Rubber (Hevea brasiliensis) in Response to Corynespora Cassiicola Causing Corynespora Leaf Disease for Gene Discovery and Marker Identification Using Ngs Platf IDENTIFICATION OF SUITABLE SPECIES AND GENOTYPES FOR CUT FOLIAGE CULTUVATION ON RUBBER LANDS Frequency of Occurrence and the Role of Colletotrichum Species on the Colletotrichum Leaf Fall Disease of Hevea brasiliensis in the Traditional Rubber Growing Regions of Kerala POTENTIAL OF INCREASING THE PLANTING DENSITY OF RUBBER IN SRI LANKA RUBBER FACTORY EFFLUENTS TREATMENT WITH UASB –STABILIZATION POND- OXIDATION DITCH METHOD The Role of Myanmar Rubber Planters and Producers Association (MRPPA) in Natural Rubber Development and its Recent Activities MANAGEMNET OF CORYNESPORA LEAF FALL DISEASE OF RUBBER IN THE NURSERY Effect of Temperature Constraints on Photosynthesis of Rubber (Hevea brasiliensis) JDM88 AGRO-VENTURES RUBBER BASED FARMING SYSTEM
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