How Is Floral Expansion Regulated?

Raab, Mandy M.; Koning, Ross E.

doi:10.2307/1310868

Cited by 19 publications

(4 citation statements)

References 22 publications

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“…The role of sepals and petals, e.g. in stamen filament growth, was reported in some cases ( Koevenig 1973; Raab and Koning 1988). Second, whereas the removal of anther inhibited filament growth in isolated WT stamens, it did not affect the growth of ms33 stamens ( Table 2).…”

Section: Resultsmentioning

confidence: 99%

“…The major part of filament growth occurs immediately before flower anthesis and, in the examples studied, this growth is mainly achieved by cell elongation (reviewed in Greyson 1994). Plant growth substances (PGSs) also have a role in filament growth, and although there are some variations between species, gibberellins (GAs), indole‐3‐acetic acid (IAA), and cytokinins promote filament growth, whereas ethylene inhibits it ( Raab and Koning 1988; Greyson 1994). Emasculation experiments involving the removal of the anther from stamens suggest that the anther may be a source of some of the PGSs and that it has an important regulatory role in filament growth ( Greyson and Tepfer 1967; Koevenig 1973; Kiss and Koning 1990).…”

Section: Introductionmentioning

confidence: 99%

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Role of plant growth substances in MS33‐controlled stamen filament growth in Arabidopsis

Fei

Sawhney

1999

Physiologia Plantarum

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The rapid growth of stamen filaments just before flower anthesis in Arabidopsis thaliana does not occur in the male sterile33 (ms33, formerly known as msZ) mutant. ms33 filaments were approximately 40% shorter than the wild type (WT), and there was corresponding reduction in the epidermal cell length of filaments. This suggests that MS33 controls the final cell‐elongation phase of filament growth. Both low temperatures and gibberellic acid (GA3) restored filament and cell growth in intact ms33 flowers, but these treatments only had a small promotive effect on WT filaments. Decapitation experiments involving the removal of the anther had the opposite effect on WT and ms33 filaments; growth was inhibited in WT, but was increased in ms33 filaments. In young stamen primordia cultured in vitro, filament growth was less in WT, but more in ms33, than in respective in vivo produced filaments. Plant growth substances (PGSs), GA3 and indole‐3‐acetic acid (IAA) were promotive, zeatin had no effect, and abscisic acid (ABA) and ethrel inhibited filament growth in both intact and decapitated WT and ms33 filaments. Together these observations suggest that MS33 is activated immediately before anthesis and that the MS33 product either regulates temporal biosynthesis of gibberellins (GAs) and/or IAA or makes the filament tissue sensitive to these PGSs, which in turn trigger cell elongation and filament growth. The data also suggest that ms33 mutant anthers contain a relatively high ratio of growth inhibitors to promoters, which inhibits epidermal cell elongation and filament growth.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Role of plant growth substances in MS33‐controlled stamen filament growth in Arabidopsis

Fei

Sawhney

1999

Physiologia Plantarum

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“…As Darwin (1877) hypothesized, between stamens and petals a developmental (Plack 1957(Plack , 1958Raab and Koning 1988) and/or genetic (Stanton and Young 1994) correlation tends to exist. The constraint is clearly breakable, however, since male> female perianth-size dimorphism is not ubiquitous.…”

Section: Perianth Sizementioning

confidence: 99%

Sexual Dimorphism in Flowers and Inflorescences

Eckhart¹

1999

Gender and Sexual Dimorphism in Flowering Plants

128

101

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“…ACC and ethylene also promoted corolla unfolding, or flower opening in I. nil (8,13) and floral senescence (9, 1 1, 16, 20). It has been proposed that the anthers of I. nil may contain high levels of ACC or IAA (15,25), both known to stimulate ethylene production, as reported in many other species (5,6,17,26,28). In turn, the filaments may function as transport vectors for the control of ethylene production rates in the corolla (23,24).…”

mentioning

confidence: 93%

Endogenous Levels and Transport of 1-Aminocyclopropane-1-Carboxylic Acid in Stamens of Ipomoea nil (Convolvulaceae)

Kiss¹,

Koning²

1989

Plant Physiol.

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Filament and corolla growth in flowers of lpomoea nil are inhibited by ethylene production. Anthers inhibited filament growth in vitro during younger stages of development even in the presence of the growth promoter gibberellic acid (GA3). To test whether the anthers could be sources of 1-aminocyclopropane-1-carboxylic acid (ACC) endogenous levels of ACC and ethylene production were monitored using gas chromatography. To also test whether the filaments could be transport vectors for ACC the movement of [14CJACC was assessed by scintillation counting from donor agarose blocks, through filament sections, and into receiver agarose blocks. While ACC levels fluctuated in anthers 87 to 21 h before anthesis, anthers contained increased levels of ACC from 15 to 6 hours before anthesis. Ethylene production also fluctuated but peak levels were shifted about 6 hours closer to anthesis than ACC levels within the anthers. Both ACC and ethylene levels in filaments showed fluctuations similar to those in the anthers.[14C]ACC movement became increasingly basipetal during development. Older stages showed greater polar[14C]ACC efflux rates, while all stages showed constant polar influx rates. Low levels of endogenous ACC were transported basipetally from the anther through the filament into agarose blocks at all stages of development. Corresponding levels of endogenous ethylene production remained constant between the varous stages during ACC transport. We have evidence that stamens of 1. nil have a role as source tissues and transport vectors for ACC, to stimulate corolla growth, such as corolla unfolding and senescence.

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How Is Floral Expansion Regulated?

Cited by 19 publications

References 22 publications

Role of plant growth substances in MS33‐controlled stamen filament growth in Arabidopsis

Role of plant growth substances in MS33‐controlled stamen filament growth in Arabidopsis

Sexual Dimorphism in Flowers and Inflorescences

Endogenous Levels and Transport of 1-Aminocyclopropane-1-Carboxylic Acid in Stamens of Ipomoea nil (Convolvulaceae)

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