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Hideyuki Matsuura Kumiko Ohashi Hiroshi Sasako Noriko Tagawa Yuuko Takano Yumiko Ioka Kensuke Nabeta Teruhiko Yoshihara 《Plant Growth Regulation》2008,54(1):31-36
Root exudate of Vigna unguiculata was extracted from a soil system consisting of charcoal and vermiculite. Germination stimulating activity for Striga gesnerioides was found in extracts of the soil system, and an active compound was isolated. The chemical structure of the active ingredient
was determined to be (+)-4-O-acetylorobanchol, based on analysis of the spectral data of 1-D and 2-D NMR together with nuclear Overhauser effect (NOE)
experiments. Application of the active compound to the seeds of S. gesnerioides at a concentration of 0.35 × 10−9 mol/disk led to 69% germination. The germination observed with application of GR-24, a positive control, at 0.57 × 10−10 mol/disk was 80%. 相似文献
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Yaakov Goldwasser Kaori Yoneyama Xiaonan Xie Koichi Yoneyama 《Plant Growth Regulation》2008,55(1):21-28
The germination stimulants produced by Arabidopsis thaliana, a host of root parasitic plants Orobanche spp. but not of arbuscular mycorrhizal (AM) fungi were examined. Root exudates from the hydroponically grown A. thaliana plants were subjected to reverse phase high performance liquid chromatography (HPLC) and retention times of germination stimulants
inducing O. aegyptiaca seed germination were compared with those of strigolactone standards. In addition, the root exudates were analyzed by using
HPLC linked with tandem mass spectrometry (LC/MS/MS). A. thaliana was found to exude at least three different germination stimulants of which one was identified as orobanchol. This is the
first report of strigolactone production by a non-mycotrophic plant. These results together with recent knowledge imply that
strigolactones have other unrevealed functions in plant growth and development. 相似文献
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Plant derived sesquiterpene strigolactones, which have previously been characterized as germination stimulants for root parasitic
plants, have recently been identified as the branching factors which induce hyphal branching morphogenesis, a critical step
in host recognition by arbuscular mycorrhizal (AM) fungi. We show here that, in red clover plants (Trifolium pratense L.), which is known as 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, Mg, Ca) in the culture medium significantly
promotes the release of a strigolactone, orobanchol, by the roots of this plant. In red clover plants, the level of orobanchol
exudation appeared to be regulated by P availability and was in good agreement with germination stimulation activity of the
root exudates. This implies that under P deficiency, plant roots attract not only symbiotic fungi but also root parasitic
plants through the release of strigolactones. This is the first report demonstrating that nutrient availability influences
both symbiotic and parasitic interactions in the rhizosphere. 相似文献
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