Journal
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
Volume 9, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fbioe.2021.657635
Keywords
symbiosis; phytohormones; yucasin; Zea mays; biotroph
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2017R1D1A1B04035601]
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The study found that the addition of auxin inhibitor significantly promoted the growth of maize seedlings by the endophytic fungus. However, later on, the high levels of auxin interfered with the activity of plant defense compounds and brassinosteroids, leading to inhibited growth of the seedlings.
Auxin is the reciprocal signaling molecule, which interferes with other phyto-hormonal and physiological processes during plant-microbes interaction. In this regard, Bipolaris spp., a growth-promoting endophytic fungus was used to inoculate pre-stressed Zea mays seedlings with yucasin (IAA inhibitor). The IAA-deficient host was heavily colonized by the endophyte that subsequently promoted the host growth and elevated the IAA levels with a peak value at 72 h. However, the seedling growth was inhibited later (i.e., at 120 h) due to the high levels of IAA that interfered with the activity of phytoalexins and brassinosteroids. Such interference also modulated the endophytic fungus from symbiotic to biotrophic pathogen that left the host plants defenseless.
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