Study of yeast diversity in aquatic plants and screening of plant growth promoting yeasts

Name: Napapohn Kajadpai

LCSH: Kasetsart University -- Theses. M.S. (Microbiology) 2022

Classification :.LCCS: QR151

LCSH: Kasetsart University. -- Department of Microbiology -- Theses

LCSH: Yeast

LCSH: Aquatic plants

LCSH: Plant growth promoting substances

LCSH: Plant regulators

Abstract: This study evaluated yeast diversity on three aquatic plants including duckweed (Lemnaceae), water lettuce (Pistia stratiotes) and water hyacinth (Pontederia crassipes) by using culture-dependent method. A total of 345, 177 and 108 of yeast isolates were obtained from 72 duckweed, 10 water lettuce and 10 water hyacinth samples, respectively. The results of yeast identification based on the D1/D2 region of the large subunit (LSU) rRNA gene sequence analysis revealed that yeast species obtained from three aquatic plants were members of both ascomycetous and basidiomycetous yeasts. The yeast species, Papiliotrema laurentii, Candida tropicalis and Candida parapsilosis, were the most frequently found in duckweed, water lettuce and water hyacinth samples, respectively. To evaluate yeast diversity indices, the Shannon-Wiener index (H') and Shannon equitability index (EH) values were calculated. The H’ values of yeast on duckweed, water lettuce and water hyacinth were 3.68, 2.95 and 2.82, respectively, whereas the EH values were 0.88, 0.91 and 0.93, respectively. These results indicated that yeast communities on duckweed, water lettuce and water hyacinth were diverse and evenly distributed. The species accumulation curve showed that the observed species richness was lower than expected. According to the study on plant growth promoting characteristics of yeasts from aquatic plants, 465 yeasts produced indole-3-acetic acid (IAA) in concentrations ranging from 0.08 to 769.24 mg/L. Four-hundred and twenty-six yeast isolates demonstrated phosphate solubilizing activity in the range of 0.32-2.64 solubilization efficiency (SE) units, and 508 isolates produced siderophores in the range of 0.72- 2.83 activity units (AU). This research suggests that aquatic plants are possible sources for plant growth promoting yeasts.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Nantana Srisuk

Role: Thesis Advisor

Name: Pannida Khunnamwong

Role: Thesis CO-Advisor

Created: 2022

Modified: 2025-07-24

Issued: 2025-07-24

วิทยานิพนธ์/Thesis

application/pdf

URL: https://www.lib.ku.ac.th/KUthesis/2565/napapohn-kaj-all.pdf

CallNumber: QR151 .N37

eng

DegreeName: Master of Science

Level: Master's Degree

Descipline: Microbiology

Grantor: Kasetsart University

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