Journal of Ecology and Environment

The Ecological Society of Korea (한국생태학회)
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Occurrence of an invertase producing strain of Aspergillus niger LP5 isolated from longan pollen and its application in longan syrup production to feed honey bees (Apis mellifera L.)

  • Danmek, Khanchai (School of Agriculture and Natural Resources, University of Phayao) ;
  • Ruenwai, Rawisara (School of Agriculture and Natural Resources, University of Phayao) ;
  • Sorachakula, Choke (School of Agriculture and Natural Resources, University of Phayao) ;
  • Jung, Chuleui (Department of Plant Medicals, Andong National University) ;
  • Chuttong, Bajaree (Meliponini and Apini Research Laboratory, Department of Entomology and Plant Pathology, Faculty of Agriculture, Chiang Mai University)
  • Received : 2022.01.07
  • Accepted : 2022.05.18
  • Published : 2022.06.30
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Abstract

Background: In northern Thailand, the longan flower is the principal nectar source for honey production. Microorganisms play a critical function in the agricultural ecology. The morphological characteristics of fungal species found in longan pollen were studied. Aspergillus spp. were found to be invertase-producing strains and were employed in the longan syrup production process. The purpose of this study was to evaluate the effects of invertase-added longan syrup on the adult honey bee population numbers that were fed by this syrup for 16 weeks. Results: Different fungal species were found in longan pollen samples. Aspergillus was the main genus, with three predominant sections: Nigri, Flavi, and Terrei. Other isolated species were Trichoderma spp., Rhizopus spp., Neurospora spp., Chaetomium spp., Fusarium spp. and Penicillium spp. However, Aspergillus spp. is the only fungal species that produces the enzyme invertase. The invertase-producing strains belonging to the Aspergillus section Nigri were found to be A. niger LP5 with an optimum activity at pH 6.0 and 60℃. When A. niger LP5 invertase was used for longan syrup processing, the highest levels of glucose (3.45%) and fructose (2.08%) were found in invertase added longan syrup (C), while fresh (A) and boiled longan syrup (B) had lower contents of both sugars. The sucrose content was detected in (A) at 4.25%, while (B) and (C) were at 4.02% and 3.08%, respectively. An appropriate amount of sugar to feed and maintain the honey bee population was considered. The data showed no statistically significant differences between the two selected forms of longan syrup compared to the sugar syrup examined by the adult honey bee population. Conclusions: The main species of isolated fungi from longan pollen were Aspergillus spp. The discovery of an invertase-producing strain of A. niger LP5 has enabled its application for enzyme utilization in the invert sugar preparation process. The adult worker bee populations fed by longan syrup from both boiled and invertase-added sources showed an increasing trend. Artificial syrup made from longan fruit to feed honey bees when natural food sources are limited can be applied.

Keywords

Acknowledgement

The authors would like to thank Mr.Chainarong Wongsansree, Chiang Rai Animal Nutrition Research and Development Center, Department of livestock, for technical and laboratory supports. We thank anonymous reviewers for their comments on this manuscript.

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