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Unravelling fungal diversity in Pestalotiopsis leaf fall disease symptomatic leaves of Hevea brasiliensis in Malaysia
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Unravelling fungal diversity in Pestalotiopsis leaf fall disease symptomatic leaves of Hevea brasiliensis in Malaysia
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Journal Article
Unravelling fungal diversity in Pestalotiopsis leaf fall disease symptomatic leaves of Hevea brasiliensis in Malaysia
2024
Overview
Pestalotiopsis leaf fall disease (PLFD) has been on the increase in recent years, resulting in diminished latex yield in many rubber producing countries. Thus far, some reports have pointed to the presence of fungal pathogen(s) other than
Pestalotiopsis
sp. in the diseased leaves. To decipher the diversity of fungal pathogens, a total of 110 early-stage and another 110 late-stage symptomatic leaves were sampled from 12
Hevea
clones in seven different areas in Malaysia during wintering and wet seasons at different times of the year. A total of 487 fungal isolates were obtained; 241 were from the early-stage and 246 from the late-stage symptomatic leaves. These isolates were clustered into 11 morphotypes based on colony appearance and microscopic observation of the spore. The diversity analysis revealed significant differences in morphotype richness and evenness when comparing different rubber clones, seasonal effects, and locations by which the fungal isolates were sampled. Five isolates representative of the five predominant morphotypes associated with PLFD were analysed using the Internal Transcribed Spacer (ITS) markers and BLAST analysis. Their closest relative species were identified as
Colletotrichum conoides
,
Neopestalotiopsis surinamensis
,
Lasiodiplodia theobromae
,
Phyllosticta fallopiae
and
Letendraea cordylinicola.
This study enhanced our understanding of PLFD, particularly the diversity and distribution of fungal communities associated with the disease across different rubber clones, seasons, and locations in Malaysia. The identification of these fungal isolates associated with PLFD symptoms paves the way for further research into their pathogenicity and the development of targeted management strategies to mitigate the disease.
Publisher
Springer Nature Singapore,Nature Publishing Group
Subject
