Diffusible IAA and dominance phenomena in fruits of apple and tomato

Gruber, J. P.; Bangerth, F.

doi:10.1111/j.1399-3054.1990.tb06753.x

Cited by 38 publications

(10 citation statements)

References 19 publications

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“…Similar results have been achieved as far as 3 H-IAA transport is concerned by Morris (1977). In experiments where other dominance phenomena were studied, like wheat grains (Aufhammer et al 1986), fruit of cucumber (Shehata 1990) and tomato and apple (Gruber and Bangerth 1990), transport of endogenous IAA was always higher out of dominant organs. These facts may be explained by assuming, beside an autostimulating effect of IAA on its own basipolar transport system (Goldsmith 1977), in the dominant branch, an 'autoinhibition effect at junctions', where the two IAA streams meet each other and extend in the dominated branch (Bangerth 1989; see also Warren-Wilson et al 1991 for similar effects).…”

Section: Discussionsupporting

confidence: 73%

Autoinhibition of indoleacetic acid transport in the shoots of two‐branched pea (Pisum sativum) plants and its relationship to correlative dominance

Bangerth

1999

Physiologia Plantarum

111

106

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Two‐branched pea plants (Pisum sativum L. cv. Lisa ZS) with different dominance degrees, obtained by removing the epicotyl shortly after germination, were used to study the interaction between the polar transport of indoleacetic acid (IAA) in both branches of the plants and its relationship to correlative dominance. The dominant shoot had higher transport capacity for C‐IAA applied to the cut stump of one side of the Y‐form explant was used, the stronger the H‐IAA transport was inhibited and the more the transported IAA was conjugated above the junction on the other side. The results of these experiments support the autoinhibition hypothesis at junctions. The relationship between elongation growth and IAA export/transport in the two‐branch pea plants is considered.

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Section: Discussionsupporting

confidence: 73%

Autoinhibition of indoleacetic acid transport in the shoots of two‐branched pea (Pisum sativum) plants and its relationship to correlative dominance

Bangerth

1999

Physiologia Plantarum

111

106

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“…For instance, in both phenomena, inhibitory effects can be abolished by physical removal of the dominant structures (e.g. shoot tips or early developing fruits), while application of the hormone auxin to the cut site reverses the loss of inhibition (McCallum, ,b; Snow, ; Thimann and Skoog, ; Quinlan and Preston, ; Bangerth, ; Gruber and Bangerth, ; Thomas et al ., ). The growth of an organ is also tightly correlated with its ability to export auxin (Bangerth, ).…”

Section: Introductionmentioning

confidence: 99%

When the BRANCHED network bears fruit: how carpic dominance causes fruit dimorphism in Aethionema

et al. 2018

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Life in unpredictably changing habitats is a great challenge, especially for sessile organisms like plants. Fruit and seed heteromorphism is one way to cope with such variable environmental conditions. It denotes the production of distinct types of fruits and seeds that often mediate distinct life-history strategies in terms of dispersal, germination and seedling establishment. But although the phenomenon can be found in numerous species and apparently evolved several times independently, its developmental time course or molecular regulation remains largely unknown. Here, we studied fruit development in Aethionema arabicum, a dimorphic member of the Brassicaceae family. We characterized fruit morph differentiation by comparatively analyzing discriminating characters like fruit growth, seed abortion and dehiscence zone development. Our data demonstrate that fruit morph determination is a 'last-minute' decision happening in flowers after anthesis directly before the first morphotypical differences start to occur. Several growth experiments in combination with hormone and gene expression analyses further indicate that an accumulation balance of the plant hormones auxin and cytokinin in open flowers together with the transcript abundance of the Ae. arabicum ortholog of BRANCHED1, encoding a transcription factor known for its conserved function as a branching repressor, may guide fruit morph determination. Thus, we hypothesize that the plasticity of the fruit morph ratio in Ae. arabicum may have evolved through the modification of a preexisting network known to govern correlative dominance between shoot organs.

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“…Ursache hierfur soU eine Angleichung der IAA-Exportraten aus generativen Organen sein. Untersuchungen von GRUBER und BANGERTH (1990) zeigten, daf^ die sich zuerst entwickelnden dominanten Friichte deutlich hohere IAA-Exportraten aufweisen als unterdriickte Friichte.…”

Section: Diskussionunclassified

Einfluß eines Wachstumsregulators auf die ‘Sink’‐Kapazität von Raps (Brassica napus L.)

Fisahn

Höfner

1995

J Agronomy Crop Science

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Influence of a Plant Growth Regulator on the ‘Sink’ Capacity of Oilseed Rape (Brassica napus L.) A pot experiment was carried out to examine the effect of the plant growth regulator Triapenthenol (RSW) on the apical dominance of oilseed rape and its corresponding effect on the plant's ‘sink’ capacity. RSW's influence on the number of flower primordia, flowers, pods, yield and yield structure of the whole plant and of different fractions of the plant (main shoot, lateral shoots 1–3, lateral shoots >3; 1st, 2nd and 3rd‐order lateral shoots) and its effect on gibberellin content and shoot height was measured. RSW diminished dominance of the main shoot and of 1st‐order lateral shoots: the initiation of flower primordia was increased to about 34% and 116%, respectively, in fraction lateral shoots higher than 3 and 3rd‐order lateral shoots. Buds developed in a more synchronized pattern leading to a significantly improved number of flowers and pods in fraction lateral shoots higher than 3. Despite an increased number of pods per plant, grain yield remained unchanged because of a decrease in the number of seeds per pod and an unaffected thousand‐kernel weight. A decreased content of gibberelhn A19 (GA19), GA20, GA1 and GA8 was evident after application of RSW, and a correlation between gibberellin‐content and shoot height was found. The results of this study suggest that high levels of such GAs, that primarily promote shoot elongation and strengthen the apical dominance within the plant, limit the plant's ‘sink’ capacity. These effects may be due to a gibberellin‐promoted auxin‐synthesis.

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Diffusible IAA and dominance phenomena in fruits of apple and tomato

Cited by 38 publications

References 19 publications

Autoinhibition of indoleacetic acid transport in the shoots of two‐branched pea (Pisum sativum) plants and its relationship to correlative dominance

Autoinhibition of indoleacetic acid transport in the shoots of two‐branched pea (Pisum sativum) plants and its relationship to correlative dominance

When the BRANCHED network bears fruit: how carpic dominance causes fruit dimorphism in Aethionema

Einfluß eines Wachstumsregulators auf die ‘Sink’‐Kapazität von Raps (Brassica napus L.)

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