Studies on the Biology of Wild Oats. I. Dormancy, Germination and Emergence

Sharma, Minakshi; Born, W. H. Vanden; McBEATH, D. K.

doi:10.4141/cjps76-097

Cited by 36 publications

(30 citation statements)

References 4 publications

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“…Beauv. ) and Williams (1971) (Sharma et al 1976 In our experiments, the growth of wild oats was adversely affected by soil acidity (pH below 7.5). However, the ability of wild oats to withstand more acid soil conditions than wheat or barley has been reported (Thurston 196l …”

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confidence: 69%

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Studies on the Biology of Wild Oats. Ii. Growth.

Sharma¹,

Born²,

McBEATH³

1977

Can. J. Plant Sci.

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confidence: 69%

“…La hauteur des plants et le nombre de (Thurston 1959, 196l) (Sharma et al 1976 For personal use only. For personal use only.…”

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Studies on the Biology of Wild Oats. Ii. Growth.

Sharma¹,

Born²,

McBEATH³

1977

Can. J. Plant Sci.

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“…The differences in reported time to maximum emergence are most likely because of weather conditions and possibly dormancy. Sharma et al (1976) found that maximum emergence of wild oat was reached 17 days after seeding and no further emergence occurred 30 days after seeding in USA. Non dormant A. fatua seeds may undergo secondary dormancy if the conditions for their germination are unfavourable.…”

Section: Discussionmentioning

confidence: 96%

“…No herbicide was used in all three growing seasons for weed control in the experimental plots. Soil temperature was recorded every hour during the experiment with a data-logger placed at a depth of 5-cm under the soil surface (Sharma et al, 1976;Yousefi et al, 2014). Daily rainfalls were obtained from a meteorology station located 7 km away from the experimental field ( Fig.…”

Section: Experimental Sites and Designmentioning

confidence: 99%

Short communication: Evaluation of a model for predicting Avena fatua and Descurainia sophia seed emergence in winter rapeseed

Aboutalebian

Nazari

González‐Andújar

2017

Span. j. agric. res.

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Avena fatua and Descurainia sophia are two important annual weeds throughout winter rapeseed (Brassica napus L.) production systems in the semiarid region of Iran. Timely and more accurate control of both species may be developed if there is a better understanding of its emergence patterns. Non-linear regression techniques are usually unable to accurately predict field emergence under such environmental conditions. The objectives of this research were to evaluate the emergence patterns of A. fatua and D. sophia and determine if emergence could be predicted using cumulative soil thermal time in degree days (CTT). In the present work, cumulative seedling emergence from a winter rapeseed field during 3 years data set was fitted to cumulative soil CTT using Weibull and Gompertz functions. The Weibull model provided a better fit, based on coefficient of determination (R

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“…We examined this possibility in two ways. First, it is well established that phytohormone treatments will break dormancy in wild oat seed, including gibberellins (6), cytokinins (18), and ethylene (1). (9)(10)(11).…”

Section: Resultsmentioning

confidence: 99%

Role of Endogenous Growth Regulators in Seed Dormancy of Avena fatua

Metzger

Sebesta²

1982

Plant Physiol.

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The hypothesis that endogenous short chain fatty acids (C 6-C 10) are important in maintaining seeds of wild oat (Avenafatua L.) in the dormant state by acting as natural germination inhibitors (Berrie, Buller, Don, Parker, 1979 Plant Physiol 63: 758-764) was investigated. When germination of nondormant seeds was inhibited by treatment with short chain fatty acids, the seeds did not revert to a similar biochemical and physiological state as exhibited by dormant seeds. First, nonanoic acid-induced inhibition of seed germination was not reversed by hormone treatments which normally break dormancy in wild oat seeds. Second, nondormant seeds treated with short chain fatty acids maintained similar relative proportions of the pentose phosphate pathway and the Embden-MeyerhoffParnas pathway for respiratory glucose metabolism as that found in the nondormant controls. Seeds imbibed in the presence of nonanoic acid lost more amino acids and proteins into the imbibition solution than did the untreated controls, suggesting membrane damage had occurred. Inasmuch as increasing concentrations of nonanoic acid also progressively reduced the growth of the coleoptile and roots of intact seedlings until all growth ceased and no germination occurred, the inhibition of seed germination could be due to a nonspecific inhibition of growth of the embryo, perhaps because of disruption of membrane structure and function. Finally, no correlation between endogenous levels of short chain fatty acids in seeds or isolated embryonic axes and seed dormancy could be demonstrated.Seeds of wild oat (Avenafatua L.) are normally dormant at the time of dehiscence from the parent plant; that is, even though fully viable, dormant seeds will not resume growth when supplied conditions that support germination of nondormant seeds (21).Upon dry storage, dormant seeds undergo physiological and biochemical changes, termed afterripening, which cause the transition from a dormant to a nondormant state.Endogenous growth regulators have been implicated in the induction, maintenance, and termination of dormancy in seeds of A. fatua (21). Recently, it has been proposed that volatile fatty acids of chain length C 6-C 10 play a major role in the induction and maintenance of seed dormancy in wild oat by acting as natural germination inhibitors (2). The reasoning behind this hypothesis was 3-fold: first, fatty acids, particularly C 7, C 8, and C 9, were moderately effective inhibitors of seed germination in A. fatua (3). Second, the endogenous levels of fatty acids in dormant seeds were in the range necessary for inhibition of 'To whom correspondence should be addressed. germination of nondormant seeds. Third, and most importantly, there was a strong correlation between the levels of endogenous short chain fatty acids and the degree of dormancy in seeds of wild oat (2). These workers suggested that loss of the fatty acids by evaporation from the seeds could explain the basic mechanism underlying the afterripening process (2).Implicit in this work is the assum...

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Studies on the Biology of Wild Oats. I. Dormancy, Germination and Emergence

Abstract: For personal use only.

Cited by 36 publications

References 4 publications

Studies on the Biology of Wild Oats. Ii. Growth.

Studies on the Biology of Wild Oats. Ii. Growth.

Short communication: Evaluation of a model for predicting Avena fatua and Descurainia sophia seed emergence in winter rapeseed

Role of Endogenous Growth Regulators in Seed Dormancy of Avena fatua

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