Journal
PLANTS-BASEL
Volume 11, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/plants11050606
Keywords
germination stimulant; isothiocyanates; Phelipanche; structure-activity relationship; suicidal germination
Categories
Funding
- Japan Society for the Promotion of Science [KAKENHI 15J40043, 16K18560, 21H02125]
- Japan Science and Technology Agency, Precursory Research for Embryonic Science and Technology (PRESTO) [JPMJPR17QA]
- Grants-in-Aid for Scientific Research [16K18560, 21H02125] Funding Source: KAKEN
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This study discovered that isothiocyanates (ITCs) have a stimulating effect on the germination of Phelipanche seeds, especially when their structures are optimized. However, the efficacy of ITCs varies among different species of Phelipanche seeds.
The root parasitic weed broomrapes, Phelipanche spp., cause severe damage to agriculture all over the world. They have a special host-dependent lifecycle and their seeds can germinate only when they receive chemical signals released from host roots. Our previous study demonstrated that 2-phenylethyl isothiocyanate is an active germination stimulant for P. ramosa in root exudates of oilseed rape. In the present study, 21 commercially available ITCs were examined for P. ramosa seed germination stimulation, and some important structural features of ITCs for exhibiting P. ramosa seed germination stimulation have been uncovered. Structural optimization of ITC for germination stimulation resulted in ITCs that are highly active to P. ramosa. Interestingly, these ITCs induced germination of P. aegyptiaca but not Orobanche minor or Striga hermonthica. P. aegyptiaca seeds collected from mature plants parasitizing different hosts responded to these ITCs with different levels of sensitivity. ITCs have the potential to be used as inducers of suicidal germination of Phelipanche seeds.
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