Record ID No. |
2030 |
Author(s) |
Yoneyama K., Xie X.N., Kusumoto D., Sekimoto H., Sugimoto Y., Takeuchi Y., Yoneyama K , 2007 |
Affiliation |
Utsunomiya University, Weed Sci Ctr, 350 Mine Machi, Utsunomiya, Tochigi 3218505, JAPAN |
Title |
Nitrogen deficiency as well as phosphorus deficiency in sorghum promotes the production and exudation of 5-deoxystrigol, the host recognition signal for arbuscular mycorrhizal fungi and root parasites |
Source. Vol.(no):Page |
Planta.227(1):125-132p. |
Categories |
Mycorrhiza General |
Subjects |
Biochemistry |
Sub-subjects |
Miscellaneous |
Organism |
n.a. |
Country |
JAPAN, Asia |
Abstracts |
Strigolactones released from plant roots induce hyphal branching of symbiotic
arbuscular mycorrhizal (AM) fungi and germination of root parasitic weeds, Striga and Orobanche
spp. We already demonstrated that, in red clover plants (Trifolium pratense L.), a host for both
AM fungi and the root holoparasitic plant Orobanche minor Sm., reduced supply of phosphorus (P)
but not of other elements examined (N, K, Ca, Mg) in the culture medium significantly promoted
the secretion of a strigolactone, orobanchol, by the roots of this plant. Here we show that in
the. Case of sorghum [Sorghum bicolor (L.) Moench], a host of both the root hemiparasitic plant
Striga hermonthica and AM fungi, N deficiency as well as P deficiency markedly enhanced the
secretion of a strigolactone, 5-deoxystrigol. The 5-deoxystrigol content in sorghum root tissues
also increased under both N deficiency and P deficiency, comparable to the increase in the root
exudates. These results suggest that strigolactones may be rapidly released after their
production in the roots. Unlike the situation in the roots, neither N nor P deficiency affected
the low content of 5-deoxystrigol in sorghum shoot tissues. |