Dormancy Studies in Seed of Avena Fatua: 2. A Gibberellin-Sensitive Inhibitory Mechanism in the Embryo

Naylor, J. M.; Simpson, G. M.

doi:10.1139/b61-023

Cited by 87 publications

(46 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Chemicals used to induce the germination of D-embryos have little influence on the physical aspects associated with germination of the AR-embryos. This supports observations made by Naylor and Simpson (1961). In addition, these treatments have little effect on the transition from coleorhiza enlargement to radicle elongation as judged by the time required for ARembryos to move from the end of stage 1 to the end of stage 2 (Table 2).…”

Section: Discussionsupporting

confidence: 88%

Developmental Differences Between Germinating After-ripened and Dormant ExcisedAvena fatuaL. Embryos

1997

View full text Add to dashboard Cite

Based on physiological and molecular differences associated with the germination of after-ripened and dormant caryopses and excised embryos, it has been hypothesized that various methods of after-ripening are the only treatments that facilitate the transition of dormant wild oat embryos to a non-dormant state. To further investigate this hypothesis, analytical methods were used to evaluate physical and temporal changes associated with germination and subsequent growth of after-ripened and dormant excised embryos (AR-embryos and D-embryos, respectively) induced to germinate with fructose (Fru) and\or gibberellic acid (GA). While chemical treatments of Fru, GA, and FrujGA have little effect on the germination and short-term growth of AR-embryos, they do induce germination of D-embryos. Growth following germination of D-embryos varied according to treatment with the combination of FrujGA inducing the greatest growth over the duration of the experiment. Even considering differences in the time to complete germination, growth of D-embryos was not comparable with that of AR-embryos. This provides physical evidence that chemical treatments induce germination without fulfilling the requirements for normal after-ripeningenhanced germination\growth, and indicates that fructose and\or gibberellic acid do not remove the dormancy-block or rate limiting step in the same manner as after-ripening.# 1997 Annals of Botany Company

show abstract

Section: Discussionsupporting

confidence: 88%

Developmental Differences Between Germinating After-ripened and Dormant ExcisedAvena fatuaL. Embryos

1997

View full text Add to dashboard Cite

show abstract

“…4) implies that the effect of GA cannot be merely to supply respiratory substrate but that it interacts in some way with succinate catabolism. Similarly Naylor and Simpson (13) demonstrated that GA and sucrose interacted synergistically to shorten the lag period before the germination of excised embryos of A. fatua.…”

Section: Discussionmentioning

confidence: 87%

Regulation of the Krebs cycle and pentose phosphate pathway activities in the control of dormancy of Avena fatua

Simmonds¹,

Simpson²

1972

Can. J. Bot.

Self Cite

View full text Add to dashboard Cite

SIMMONDS, J. A., and G. M. SIMPSON. 1972. Regulation of the Krebs cycle and pentose phosphate pathway activities in the control of dormancy of Avet~a fntrra. Can. J . Bot. 50: 1041-1048. Malonic acid (10-2 M ) promoted germination of excised dormant embryos of Averia fntrra L. but inhibited germination of non-dormant embryos. Malonate inhibited oxygen consun~ption and carbon dioxide evolution of dormant embryos which resulted in an increased respiratory quotient and a decrease in the glucose C6/C1 ratio. Germination is oxygen-dependent, and malonate-sensitive oxygen consumption decreased during afterripening. Succinic acid (5 X 10-2 M ) promoted germination of dormant embryos. Gibberellic acid (GA) (1.0 ppm) and succinate (5 X 10-2lM) interacted synergistically in promoting germination. Adenosine diphosphate also promoted germination but only after a considerable lag period. Germination of non-dormant embryos was inhibited by 3,4-dinitrophenol indicating the importance of adenosine triphosphate for germination. Storage of caryopses in various gaseous environments indicated that the response of dormant embryos to GA treatment was dependent on the operation of oxidative processes during afterripening. A model is proposed, indicating the nature of the regulation of the oxidative systems involved in the control of dormancy. The model accounts for the known effects of oxygen treatments on seeds, provides an explanation of the mechanism of afterripening, and explains the survival of imbibed dormant caryopses during adverse conditions. Such a model may be of widespread significance and is discussed in relation to its interaction with G A in developmental processes. SIMMONDS, J. A., et G. M. SIMPSON. 1972. Regulation of the Krebs cycle and pentose phosphate pathway activities in the control of dormancy of Averra fatrra. Can. J . Bot. 50: 1041-1048. Le traitement d'acide nlalonique (10-2 M ) stimule la germination des embryons dormants excises d'Averza fatlra L. mais arr&te la germination des embryons non-dormants. L'acide malonique arrCte la consommation d'oxygttne et I'Cvolution de bioxyde de carbone des enlbryons dormants, ce qui aboute A un quotient respiratoire croissant et A une proportion glucose C~/ C I plus basse. L'oxygtne est essentiel pour la germination des embryons, et la consommation d'oxygene qui est sensible ?I l'acide malonique dkroissent pendant le mfirissement secondaire. L'acide succinique (5 X 10-2 M ) stimule la germination des embryons dormants. L'acide gibbkrellique (1.0 ppm) et I'acide succinique (5 X 10-2 M ) reagissent synergiquement I'un sur I'autre stimulant la germination. Le diphosphate d7adCnosine aussi stimule la germination mais seulement aprtts une pCriode de latence considtrable. Le 2,4-dinitrophenol arr6te la germination des embryons non-dormants, ce qui indique I'importance du triphosphate d'adtnosine pour la germination. L'en~magasinage des caryopses dans divers environnements gazeux indique que la rtponse des embryons dormants au traitement d'acide gibberellique etait dependante de...

show abstract

“…Similar results have been reported for wild oats by Naylor and Simpson (1961). This hypothesis contrasts with the findings of Rost (1971bRost ( , 1972) that caryopsis dormancy release by embryo exci sion in yellow foxtail occurs in the absense of exogenously supplied nutrients.…”

Section: Stratification (Weeks)supporting

confidence: 82%

“…This contrasts with another common Gramineae weed, wild oats (Avena fatua). where innate dormancy is rapidly relieved by after-ripening (Naylor and Simpson, 1961).…”

Section: Caryopsis Dormancymentioning

confidence: 99%

“…There is some evidence that the release from dormancy is attributable to the supplied sugar alone. First, Naylor and Simpson (1961) determined that dormancy release in newly matured embryos of wild oats is separable into deficiencies of two requirements, (1) a requirement for sucrose and (2) a requirement for gibberellic acid. Their evidence suggests that during after-ripening the satisfaction of the requirement for sucrose precedes that for gibberellin.…”

Section: Stratification (Weeks)mentioning

confidence: 99%

See 1 more Smart Citation

Physiological and ultrastructural investigations of caryopsis dormancy in Setaria lutescens (Gramineae)

Lehle

View full text Add to dashboard Cite

Dormancy Studies in Seed of Avena Fatua: 2. A Gibberellin-Sensitive Inhibitory Mechanism in the Embryo

Cited by 87 publications

References 5 publications

Developmental Differences Between Germinating After-ripened and Dormant ExcisedAvena fatuaL. Embryos

Developmental Differences Between Germinating After-ripened and Dormant ExcisedAvena fatuaL. Embryos

Regulation of the Krebs cycle and pentose phosphate pathway activities in the control of dormancy of Avena fatua

Physiological and ultrastructural investigations of caryopsis dormancy in Setaria lutescens (Gramineae)

Contact Info

Product

Resources

About