scholarly journals Estimates of free and bound indole-3-acetic acid and zeatin levels in relation to regulation of apical dominance and tiller release in oat shoots

1983 ◽  
Vol 2 (1-4) ◽  
pp. 215-223 ◽  
Author(s):  
Marcia A. Harrison ◽  
Peter B. Kaufman
Keyword(s):  
Acetic Acid ◽  
Apical Dominance ◽  
Indole 3 Acetic Acid

scholarly journals 760 PB 184 INDOLE-3-ACETIC ACID REGULATES APICAL DOMINANCE BY CONTROLLING THE STATE OF WATER AND MEMBRANE LIPID COMPOSITION IN BUDS OF MALUS DOMESTICA BORKH

HortScience ◽  
1994 ◽  
Vol 29 (5) ◽  
pp. 541h-542
Author(s):  
Shiow Y. Wang ◽  
Miklos Faust ◽  
Michael J. Line
Keyword(s):  
Acetic Acid ◽  
Lipid Composition ◽  
Apical Dominance ◽  
Membrane Lipid ◽  
Proton Density ◽  
Membrane Lipid Composition ◽  
Lateral Buds ◽  
Terminal Bud ◽  
Lateral Bud ◽  
Indole 3 Acetic Acid

The effect of Indole-3-acetic acid (IAA) on apical dominance in apple (Malus domestica Borkh.) buds was examined by studying changes In proton density (free water) and membrane lipid composition in lateral buds. Decapitation induced budbreak and enhanced lateral bud growth. IAA replaced apical control of lateral bud paradormancy. Maximal inhibition was obtained when IAA was applied immediately after the apical bud was removed. Delaying this application weakens the effect of IAA. An increase in proton density in lateral buds was observable 2 days after decapitation, whereas the change in membrane lipid composition occurred 4 days later. Decapitating the terminal bud induced an increase in membrane galacto- and phospholipids. and the ratio of unsaturated to corresponding saturated fatty acids. Decapitation also induced a decrease in the ratio of free sterols to phospholipids in lateral buds. Application of IAA to the terminal end of decapitated shoots inhibited the increase of proton density and prevented changes in the membrane lipid composition of lateral buds.

Changes in abscisic acid and indole-3-acetic acid in axillary buds of Elytrigia repens released from apical dominance

1995 ◽  
Vol 94 (1) ◽  
pp. 110-116 ◽  
Author(s):  
David W. Pearce ◽  
John S. Taylor ◽  
J. Mason Robertson ◽  
K. Neil Harker ◽  
Edward J. Daly
Keyword(s):  
Acetic Acid ◽  
Abscisic Acid ◽  
Apical Dominance ◽  
Axillary Buds ◽  
Elytrigia Repens ◽  
Indole 3 Acetic Acid

scholarly journals Auxin apical dominance governed by the OsAsp1-OsTIF1 complex determines distinctive rice caryopses development on different branches

PLoS Genetics ◽  
2020 ◽  
Vol 16 (10) ◽  
pp. e1009157
Author(s):  
Shu Chang ◽  
Yixing Chen ◽  
Shenghua Jia ◽  
Yihao Li ◽  
Kun Liu ◽  
...  
Keyword(s):  
Grain Size ◽  
Acetic Acid ◽  
Apical Dominance ◽  
Feedback Loop ◽  
Grain Filling ◽  
Mechanistic Explanation ◽  
Developmental Differences ◽  
Expression Study ◽  
Yield Improvement ◽  
Indole 3 Acetic Acid

In rice (Oryza sativa), caryopses located on proximal secondary branches (CSBs) have smaller grain size and poorer grain filling than those located on apical primary branches (CPBs), greatly limiting grain yield. However, the molecular mechanism responsible for developmental differences between CPBs and CSBs remains elusive. In this transcriptome-wide expression study, we identified the gene Aspartic Protease 1 (OsAsp1), which reaches an earlier and higher transcriptional peak in CPBs than in CSBs after pollination. Disruption of OsAsp1 expression in the heterozygous T-DNA line asp1-1+/–eliminated developmental differences between CPBs and CSBs. OsAsp1 negatively regulated the transcriptional inhibitor of auxin biosynthesis, OsTAA1 transcriptional inhibition factor 1 (OsTIF1), to preserve indole-3-acetic acid (IAA) apical dominance in CPBs and CSBs. IAA also facilitated OsTIF1 translocation from the endoplasmic reticulum (ER) to the nucleus by releasing the interaction of OsTIF1 with OsAsp1 to regulate caryopses IAA levels via a feedback loop. IAA promoted transcription of OsAsp1 through MADS29 to maintain an OsAsp1 differential between CPBs and CSBs during pollination. Together, these findings provide a mechanistic explanation for the distributed auxin differential between CPBs and CSBs to regulate distinct caryopses development in different rice branches and potential targets for engineering yield improvement in crops.

Changes in abscisic acid and indole-3-acetic acid in axillary buds of Elytrigia repens released from apical dominance

1995 ◽  
Vol 94 (1) ◽  
pp. 110-116 ◽  
Author(s):  
David W. Pearce ◽  
John S. Taylor ◽  
J. Mason Robertson ◽  
K. Neil Harker ◽  
Edward J. Daly
Keyword(s):  
Acetic Acid ◽  
Abscisic Acid ◽  
Apical Dominance ◽  
Axillary Buds ◽  
Elytrigia Repens ◽  
Indole 3 Acetic Acid

Apical dominance in rhizomes of quackgrass, Elytrigia repens: the effect of auxin, cytokinins, and abscisic acid

1995 ◽  
Vol 73 (2) ◽  
pp. 307-314 ◽  
Author(s):  
J. S. Taylor ◽  
J. M. Robertson ◽  
K. N. Harker ◽  
M. K. Bhalla ◽  
E. J. Daly ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Acetic Acid ◽  
Abscisic Acid ◽  
Apical Dominance ◽  
Endogenous Hormones ◽  
Leaf Removal ◽  
Exogenous Hormone ◽  
Elytrigia Repens ◽  
Bud Growth ◽  
Indole 3 Acetic Acid

Experiments were designed to determine the impact of abscisic acid, indole-3-acetic acid, and cytokinins on dormancy of quackgrass (Elytrigia repens (L.) Nevski) rhizome axillary buds using exogenous hormone treatments and analysis of endogenous hormones. Exogenous hormone treatments were applied in solution or in lanolin paste to 5-node segments of rhizome with an apical tip intact or removed. Abscisic acid inhibited bud growth except at concentrations of 0.5 – 1 μg ∙ mL−1 when it stimulated growth: this appeared to be based on an inhibition of apical dominance rather than a stimulation of bud growth per se. Both indole-3-acetic acid and cytokinins stimulated bud growth, indole-3-acetic acid at concentrations of 0.5 – 5 μg ∙ mL−1 and cytokinins at higher concentrations (i.e., 10 – 100 μg ∙ mL−1). Indole-3-acetic acid also increased elongation of the buds, whereas abscisic acid and cytokinins did not. Levels of endogenous hormones were measured in bud samples: indole-3-acetic acid was quantified as its methyl ester by combined gas chromatography – mass spectrometry – selected ion monitoring; abscisic acid was quantified as its methyl ester by gas chromatography – electron capture; and cytokinins were quantified using a soybean callus bioassay. Hormone levels were generally higher in the most active buds of a 5-node section. Abscisic acid was also measured in buds 24 h after sheath leaf removal, a practice known to promote bud sprouting. Sheath leaf removal had no significant effect on abscisic acid levels. Key words: quackgrass, Elytrigia repens, auxins, abscisic acid, cytokinins, apical dominance.

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