Concentrations of Gibberellin in Chilled Hazel Seeds

Ross, James D.; Bradbeer, J. W.

doi:10.1038/220085a0

Cited by 41 publications

(12 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The effect of short stratification, as well as the effect of gibberellin treatment, was dependent on geniiinatioii temperatures. This gives support to the hypothesis tbat stratification may activate the niecbanisni for gibberellin synthesis, subsequent synthesis being thought to occtir at the germination temperatures (Ross and Bradbeer 1968). Direct support for these hypothesis can be attained only through biochemical analysis of endogenous promoters and inhibitors in the seed (Bradbeer 1968).…”

Section: Discussionmentioning

confidence: 88%

Effects of Stratification, Gibberellic acid and Germination Temperature on the Germination of Betula nana

Junttila

1970

Physiologia Plantarum

View full text Add to dashboard Cite

Experiments were carried out with three seed lots of Betula nana collected in 1967 from different localities in Norway. Seeds were stratified for 0‐20 days in dark at +2‐+3 °C on filter papers moistened with distilled water, or treated with solution of GA3 for 24 h at room temperature, and then moved into special germination boxes that were placed in different temperature conditions. All the seed lots had conditional dormancy. Quantitatively, the dormancy was different in the different seed lots (pronenances), but there were no qualitative difference in the reaction to stratification gibberellic acid and to germination temperature. Differences between seed lots may have been due to different stage of seed development. The dormancy was deepest at low temperatures(12 and 15°C) decreasing gradually with increasing temperature (to 24 °C). The dormancy was effectively broken by a short stratification (from 5 to 15 days), and by treatment with gibberellic acid. The deeper the dormancy and the lower the germination temperature the longer the stratification that was needed for maximum germination. Similarly, the concentration of GA3 needed for maximum germination increased with decreasing temperature and with increasing dormancy.

show abstract

Section: Discussionmentioning

confidence: 88%

Effects of Stratification, Gibberellic acid and Germination Temperature on the Germination of Betula nana

Junttila

1970

Physiologia Plantarum

View full text Add to dashboard Cite

show abstract

“…Downloaded from www.nrcresearchpress.com relatively little change in gibberellin levels can be detected during treatment itself (Ross and Bradbeer 1968). The ability of hazel seed to cumulation of gibberellin in either an active or in-produce gibberellins at higher temperatures is active conjugate form in the dry seed, but rather the greatly enhanced during cold treatment although Can.…”

Section: Figmentioning

confidence: 98%

Endogenous hormones in afterripening wild oat (Avena fatua) seed

Taylor¹,

Simpson²

1980

Can. J. Bot.

View full text Add to dashboard Cite

TAYLOR. J. S.. a n d G . M. SIMPSON. 1980. Endogenous hormones inafterripening wild oat (Acetin frrttrri) seed. Can. J. Bot. 58: 1016-1024. Levels of gibberellins and cytokinins in dormant Auetirr frrtlrn L. seeds were measured by bioassay during the afterripening process. Little change in the level of either hormone was detected in the dry seed. Following imbibition of fully afterripened seed, however, gibberellin levels increased while cytokinin levels declined. Seed strains varying in their degree ofdormancy were also analysed for hormone levels; a significantly higher level of cytokinin activity was found in the most dormant strain compared with the least dormant strain. Low levels of bound hormones, including cytokinin ribotides and gibberellin glucose conjugates. were detected following enzyme hydrolysis but neither class of compounds varied greatly in level during afterripening.The major cytokinins detected in Auetlo firtrrrr seeds cochromatographed with zeatin-9glucoside, zeatin riboside, and zeatin on both HPLC columns and chromatography paper. The major gibberellin activity cochromatographed with GA,/GA, on silica gel partition columns and thin-layer plates.Germination studies demonstrated that GA,,, is significantly moreactive than GA, in promoting the germination of dormant Au~nrr ffrtirrr seeds. External applications of cytokinins were not found to affect the germination of dormant seed, but did promote germination in partially afterripened material. TAYLOR, J. S., et G. M. SIMPSON. 1980. Endogenous hormones in afterripening wild oat (AUPIIO frrtrrri) seed. Can. J. Bot. 58: 1016-1024. Les niveaux de giberellines et de cytokinines dans les graines en dormance d'Auet~rr fc~trrrr L . ont ete mesures par des tests biologiques durant la post-maturation. Peu d e changements dans les niveaux des deux hormones ont etC decelks dans lagraine seche. Cependant, apres I'imbibition d e la graine ayant termine sa post-maturation. le niveau des giberellines augmente tandis que celui des cytokinines diminue. Les niveaux d'hormones ont aussi ete analyses dans des graines qui different par leur degre d e dormance; on trouve une plus grande activite des cytokinines dans les graines manifestant la plus forte dormance que dans celles dont la dormance est la plus faible. De faibles niveaux d'hormones liees, y compris des ribotides de cytokinine et des composes d e giberelline et glucose, ont ete deceles apres une hydrolyse des enzymes, mais aucune de ces classes de composes ne varie beaucoup durant la post-maturation.Les principales cytokinines decelees dans les graines d'Auet~ufiltlla par co-chromatographie sur papier et sur colonnes de HPLC sont le zeatine-9-glucoside, le riboside d e zeatine et la zeatine. La principale activite giberellinique determinee par co-chromatographie sur colonnes d e gel de silicate et sur couches minces est GA,/GA,.Des etudes de germination montrent que la germination des graines dormantes d'Auetlrifrrturr est facilitle par le GA,,, plus que parle GA,. L'application externe d e cytokinines n'...

show abstract

“…These various changes can be correlated in tinae with the breaking of embryo dormancy. The biosynthesis of GA (Ross and Bradbeer 1968) and the degradation of ABA have also been demonstrated to rise when embryo dormancy is relieved by afterripening, (Lewak er a/. 1975), Increases in respiratory activity are known to occur with stratification (Pollock and OIney 1959), and we have attempted to utilize inhibitors as a means of distinguishing between respiratory capacities and actual etigagement of the known respiratory pathways as they may occur during stratification of the seeds of pear.…”

Section: Introductionmentioning

confidence: 99%

Respiratory changes with stratification of pear seeds

Alscher-Herman

Musgrave

Leopold

et al. 1981

Physiologia Plantarum

View full text Add to dashboard Cite

1981. Respiratory changes with stratification of pear seeds. -Physioi Plaot. 52: 156-160.Experiments on the stratification of seeds of pear {Pyrus communis ev. Bartlett) indicate that there is a progressive increase in respiratory capacity, with about a three-fold increase developing during a 30-day stratification period. Evidence is presented suggesting this increase in respiratory capacity occurs in the cytochrome o.xidase pathway and not in the alternative pathway of respiration. The increase is much less pronounced if the seeds are held at 25''C rather than at 6°C. The seed coat serves as a barrier to the expression of the increased respiratory capacity.

show abstract

Concentrations of Gibberellin in Chilled Hazel Seeds

Cited by 41 publications

References 7 publications

Effects of Stratification, Gibberellic acid and Germination Temperature on the Germination of Betula nana

Effects of Stratification, Gibberellic acid and Germination Temperature on the Germination of Betula nana

Endogenous hormones in afterripening wild oat (Avena fatua) seed

Respiratory changes with stratification of pear seeds

Contact Info

Product

Resources

About