Influence of soil moisture on activity and persistence of the strigol analogue GR 24

Babiker, A. G. T.; Hamdoun, A. M.; Rudwan, A.; Mansi, N. G.; Faki, H.

doi:10.1111/j.1365-3180.1987.tb00751.x

Cited by 54 publications

(42 citation statements)

References 12 publications

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“…Orobanche solmsii seeds were found to be sensitive to soil moisture requirement during pre-conditioning period. A similar result were observed by Babiker et al (1982Babiker et al ( , 1987 in the germination of Striga hermontheca seeds in response to the strigol analogs GR 7 and GR 24 and was influenced by soil moisture prior to, during, or after stimulation. The necessity of optimum soil moisture is indicated by the maximum germination of seeds in normal soil moisture condition.…”

Section: Resultssupporting

confidence: 82%

Effects of stimulant pH, light and soil moisture on Orobanche solmsii seed germination

Bista

2016

Ecoprint

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In order to investigate effect of soil moisture, Orobanche seeds were pre-conditioned in three different soil moisture conditions. The germination percentage was found to be highest (48.31%) in normal soil moisture condition and lowest (4.6%) in flooded soil moisture condition. This indicates that Orobanche seeds are unable to survive for a long period in water logged conditions. In response to stimulant pH, Orobanche solmsii seeds showed significantly a high germination percentage (65.27%) at pH value 6.5 and it declined progressively with the increase of acidic and alkaline conditions. However, seeds appeared to be more sensitive to alkaline rather than acidic condition. The study of effect of light showed that exposure of seeds to continuous light during pre and postconditioning period inhibited seed germination. The inhibition was more effective when seeds were exposed to light during post conditioning phase rather than during pre-conditioning phase.

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Section: Resultssupporting

confidence: 82%

Effects of stimulant pH, light and soil moisture on Orobanche solmsii seed germination

Bista

2016

Ecoprint

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“…Several studies showed that Striga germination was enhanced by a succession of wet and dry conditions while continuous wetting of soil suppressed incidence (Andrews, 1945;Babikar et al, 1987;Ogborn, 1972). Except under the plastic mulching, where evaporation was prevented, the top 5 cm of the soil often dried up very rapidly due to the intense heat during the study period.…”

Section: Discussionmentioning

confidence: 99%

“…When the same seeds were stored at 31°C and 100% relative humidity, both germination and viability were reduced. Also, Babikar et al (1987), Vallance (1950) and Andrews (1945) reported that excessive soil moisture reduced Striga infestation.…”

Section: Introductionmentioning

confidence: 99%

The effect of soil temperature, moisture and nitrogen on Striga asiatica (L.) Kuntze seed germination, viability and emergence on sorghum (Sorghum bicolor L. Moench) roots under field conditions

1991

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Experiments were conducted in a Striga-sick field to study the effect of soil temperature, moisture and nitrogen on Striga parasitism on sorghum. Striga seeds contained in nylon bags and buffed at 2 cm in the soil, were exposed to different temperature and moisture treatments. Clear polythene, hay mulch and bare soil treatments were used to vary soil temperature. These treatments gave mean maximum temperatures of 60 °, 48 ° and 37°C, respectively at 2-cm soil depth. Irrigation levels of 0, 30 and 60 mm were applied to change soil moisture. Striga seed germination, viability and emergence were studied. After 34 days of preconditioning, the exhumed Striga seeds from polythene-covered plots (solarized plots) did not germinate or retain viability when these seeds were exposed to sorghum root exudate. However, seeds similarly buffed under hay mulch or bare soil, with mean maximum soil temperatures of 48 ° and 37°C, respectively, had similar germination and viability percentages. Of these 75% germinated and 85% of them were viable, regardless of the temperature treatment. Although seeds stored at high temperature and humidity (solarization) were killed, more Striga plants emerged under the polythene treatment compared to hay mulch and bare soil treatments. The observed Striga plants in the polythene mulch treatment were, therefore, assumed to have come from deeper layers where solarization was not effective. Irrigation treatments did not have significant effects on Striga seed germination and viability, but a slightly higher number of plants emerged at 60-mm irrigation level than at 30-ram and 0-mm. Striga emergence, on the other hand, was directly related to the rate of N application. Nitrogen rates of 0, 25, 50 and 100 kg ha-1 resulted in the emergence of 11, 34, 38 and 40 Striga plants per plot, respectively. Despite the high infestation at high N levels, sorghum plants did not show a loss of vigor. Nitrogen application, therefore, does not reduce Striga incidence, but seems to neutralize the harmful effects of Striga without reducing the extent of parasitism.

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“…It was suggested that strigolactones would be too stable to explain this distance‐dependent phenomenon. However, it should be realised that strigolactones are short lived in alkaline soil, presumably owing to hydrolytic degradation 54. The same group of authors also claimed that the active portion of the strigol molecule is restricted to the D‐ring because of its structural similarity to SXSg through enolisation to a hydroxyfuran 55, 56.…”

Section: Non‐strigolactones As Natural Germination Stimulantsmentioning

confidence: 99%

Structure and function of natural and synthetic signalling molecules in parasitic weed germination

Zwanenburg

Mwakaboko

Reizelman

et al. 2009

Pest Management Science

218

192

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The structures of naturally occurring germination stimulants for seeds of the parasitic weeds Striga spp. and Orobanche spp. are described. The bioactiphore in this strigolactone family of stimulants is deduced from a structure-activity relationship and shown to reside in the CD part of the stimulant molecule. A molecular mechanism for the initial stages of seed germination is proposed. The influence of stereochemistry on the stimulant activity is significant. Combining this molecular information leads to a model for the design of synthetic strigolactones. Nijmegen-1 is a typical example of a highly active, newly designed synthetic stimulant. The occurrence of natural stimulants not belonging to the strigolactone family, such as cotylenin and parthenolide, is briefly described. The biosynthesis of natural strigolactones from beta-carotene is analysed in terms of isolated and predicted stimulants. This scheme will be helpful in the search for new strigolactones from root exudates. Protein fishing experiments to isolate and characterise the receptor protein using biotin-labelled GR 24 are described. A receptor protein of 60 kD was identified by this method. Nijmegen-1 has been tested as a suicidal germination agent in field trials on tobacco infested by Orobanche ramosa L. The preliminary results are highly rewarding. Finally, some future challenges in synthesis are described. These include synthesising new natural and synthetic stimulants and establishing the molecular connection between strigolactones as germination stimulants, as the branching factor for arbuscular mycorrhizal fungi and as an inhibitor of shoot branching.

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Influence of soil moisture on activity and persistence of the strigol analogue GR 24

Cited by 54 publications

References 12 publications

Effects of stimulant pH, light and soil moisture on Orobanche solmsii seed germination

Effects of stimulant pH, light and soil moisture on Orobanche solmsii seed germination

The effect of soil temperature, moisture and nitrogen on Striga asiatica (L.) Kuntze seed germination, viability and emergence on sorghum (Sorghum bicolor L. Moench) roots under field conditions

Structure and function of natural and synthetic signalling molecules in parasitic weed germination

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