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Diversity among Isolates of the Tangerine Pathotype of Alternaria alternata
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作者 Andréa Celina Ferreira Demartelaere Luciana Cordeiro do Nascimento +8 位作者 Cristina O.Marinho Marciano Costa Nunes Patrícia Clemente Abraao rommel s.s.gomes Monica Danielly de Mello Oliveira Larissa Almeida Mirelly M.Porcino Caroline Vargas e Silva Wilza C.O.Souza 《American Journal of Plant Sciences》 2018年第2期196-215,共20页
The tangerine pathotype of Alternaria alternata is the aetiological agent of Alternaria brown spot on tangerines. In the state of Paraíba, Brazil, its occurrence on “Dancy” tangerine trees is associated with ge... The tangerine pathotype of Alternaria alternata is the aetiological agent of Alternaria brown spot on tangerines. In the state of Paraíba, Brazil, its occurrence on “Dancy” tangerine trees is associated with genetic aspects as well as the influence of environmental conditions on reproduction and dissemination within and between populations. The aim of the present study was to evaluate the diversity of isolates of this pathogen using morphophysiological and molecular markers. For the analysis of mycelial growth and sporulation, 30 isolates from different locations were examined at 24-hour intervals until the seventh day, when the spores were quantified. The 30 isolates were characterised based on molecular markers (ISSR) and genetic similarity (Jaccard index). A factor arrangement was used: 30 isolates, four media (ODA, PDA, LEA and V8), three light regimes (continuous dark, alternating light and continuous light) and three temperatures (15°C, 25°C and 35°C), with 12 repetitions. Groups 1, 2 and 3 presented low genetic variability. Group 4 showed high genetic variability of the isolates obtained from the Massaranduba (state of Paraíba-Brazil) producing region and higher mycelial growth and sporulation of A. alternata. The continuous light regime and the temperature 25°C in PDA and V8 media were the ideal conditions for the mycelial growth and sporulation, respectively, of the isolates of A. alternata. 展开更多
关键词 Citrus tangerine Alternaria Brown Spot Fungal Variability Environment Factors ISSR Markers
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