Mycorrhiza-Induced Change in Root Hair Growth Is Associated with IAA Accumulation and Expression of EXPs in Trifoliate Orange Under Two Phosphorus Levels
February 2018
in “
Scientia Horticulturae
”
TLDR Mycorrhizal fungi improve root hair growth and nutrient uptake in trifoliate orange, especially when phosphorus is low.
The study examined the impact of arbuscular mycorrhizal fungi (AMF) and phosphorus (P) levels on root hair growth in trifoliate orange seedlings. It found that AMF-inoculated seedlings exhibited higher root hair density at low P levels (0.1 mM) and lower density at high P levels (1 mM), linked to increased indole-3-acetic acid (IAA) levels and expression of expansin genes (PtEXPB2, PtEXPA2, and PtEXPA4) under low P conditions. At high P levels, AMF inoculation resulted in greater root hair length and diameter, likely due to IAA accumulation. The study demonstrated that mycorrhizal fungi influenced root hair growth through hormonal and gene expression changes, enhancing nutrient uptake efficiency, especially under phosphorus-limited conditions.
