Record ID No. |
5598 |
Author(s) |
Liu C-Y.*, Zhang F., Zhang D-J., Srivastava A. K., Wu Q-S. and Zou Y-N. , 2018 |
Affiliation |
*College of Horticulture and Gardening, Yangtze University, Jingzhou, Hubei, 434025, China. |
Title |
Mycorrhiza stimulates root-hair growth and IAA synthesis and transport in trifoliate orange under drought stress. |
Source. Vol.(no):Page |
Scientific Reports. 8(1978), doi: 10.1038/s41598-018-20456-4. |
Categories |
|
Subjects |
Genetics |
Sub-subjects |
Hormones |
Host |
Poncirus trifoliata |
Organism |
Funneliformis mosseae |
Country |
China |
Abstracts |
Root-hair growth and development regulated by soil microbes is associated with auxin. In this
background, we hypothesized that mycorrhizal fungal inoculation induces greater root-hair growth
through stimulated auxin synthesis and transport under water stress conditions. Trifoliate orange
(Poncirus trifoliata) was inoculated with an arbuscular mycorrhizal (AM) fungus (Funneliformis mosseae)
under well-watered (WW) and drought stress (DS) for 9 weeks. Compared with non-AM seedlings, AM
seedlings displayed signifcantly higher density, length, and diameter of root hairs and root indoleacetic
acid (IAA) level, whereas lower total root IAA efux, regardless of soil moisture status. Root PtYUC3
and PtYUC8 involved in IAA biosynthesis were up-regulated by mycorrhization under WW and DS,
whereas AM-modulated expression in PtTAA1, PtTAR2, PtYUC4, and PtYUC6 depended on status of
soil moisture. Mycorrhizal inoculation down-regulated the transcript level of root auxin efux carriers
like PtPIN1 and PtPIN3, whereas signifcantly up-regulated the expression of root auxin-species infux
carriers like PtABCB19 and PtLAX2 under DS. These results indicated that AMF-stimulated greater roothair growth of trifoliate orange under DS that is independent on AMF species is related with mycorrhizamodulated auxin synthesis and transport, which benefts the host plant to enhance drought tolerance. |