Dormancy and Viability of Witchweed Seeds as Affected by Temperature and Relative Humidity during Storage

Kust, C. A.

doi:10.2307/4040521

Cited by 27 publications

(25 citation statements)

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“…Higher soil moisture increases soil heat conductivity and seed sensitivity to high temperatures (Horowitz et al, 1983). Kust (1963) reported that prolonged storage of Striga seeds under hot humid conditions, similar to those observed under the polythene, killed the seeds. However, Vallance (1950) argued that Striga seeds under such conditions did not necessarily lose viability but underwent a 'wet domancy' stage.…”

Section: Discussionmentioning

confidence: 99%

“…Each disc was moistened with 25/xL of triphenyl tetrazolium chloride (TR) solution prepared as described by Kust (1963). The seeds were incubated in darkness as:.. described for germination.…”

Section: Germination and Viability Testsmentioning

confidence: 99%

“…According to Kust (1963), viable seeds varied from light red to brick-red, while non-viable seeds remained light brown. Because of the small size of Striga seeds, this procedure was not adequate to give reliable counts.…”

Section: Germination and Viability Testsmentioning

confidence: 99%

“…Musselman (1980) reported that Striga seeds would remain dormant until they were exposed to periods of warm dry conditions and these seeds became responsive to germination stimulants after pretreatment in moist warm conditions. Kust (1963) reported that Striga asiatica seeds stored at 31 °, 24 ° and 4°C at high humidity (100% RH) became responsive to a stimulant produced by corn (Zea mays L.) and had the highest germination percentages after 8, 32 and 40 weeks, respectively. When the same seeds were stored at 31°C and 100% relative humidity, both germination and viability were reduced.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Germination and Viability Testsmentioning

confidence: 99%

Section: Germination and Viability Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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show abstract

“…Certains travaux (Kust, 1963 ;Reid et Parker, 1979) semblent montrer que la durée des périodes de dormance et de pré-conditionnement varie en fonction de la température.…”

Section: Ijmunclassified