Roles of Floral Organs and Phytohormones in Flower Stalk Elongation of Cymbidium(Orchidaceae).

Ohno, Hajime; Kako, Shunji

doi:10.2503/jjshs.60.159

Cited by 6 publications

(9 citation statements)

References 10 publications

(21 reference statements)

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“…During pre-anthesis and anthesis, when the peduncle is significantly elongated, auxin necessary for peduncle elongation seems to be supplied mostly by the anthers at pre-anthesis and anthesis, until their abscission. It is in agreement with results obtained on Cymbidium flowers (Ohno and Kako 1991), which suggested that the peduncle is supplied mostly by auxins from the developing flower buds, especially from the anthers. Furthermore, selective removal of the floral parts in tulip and narcissus showed that gynoecium controls stem extension (Hanks and Rees 1977).…”

Section: Resultssupporting

confidence: 82%

“…5). A similar effect of flower stalk growth inhibition upon bud decapitation or emasculation was observed in the miniature Cymbidium orchid (Ohno and Kako 1991), the tulip (Hanks and Rees 1977;Saniewski and De Munk 1981), and the daffodil (Edelbluth and Kaldewey 1976;Hanks and Rees 1977).…”

Section: Impact On Peduncle Elongation and Vascular Anatomymentioning

confidence: 53%

“…It is suggested that auxin synthesized in the anthers contributes to the regulation of filament elongation and plays a major role in coordinating anther dehiscence and pollen maturation. In addition to regulating processes inside male reproductive tissues, it is also suggested that auxins originating in anthers may be basipetally transported and may stimulate peduncle elongation in Cymbidium orchids (Ohno and Kako 1991).…”

Section: Free Iaa Profilementioning

confidence: 99%

“…It was observed that removal of the flower or floral organs inhibits the elongation of the floral stalk or peduncle (Op den Kelder and others 1971;Hanks and Rees 1977). Treatment of emasculated or decapitated flowers with auxins (Edelbluth and Kaldewey 1976;Hanks and Rees 1977;De Munk 1979;Kohji and others 1979;Saniewski and De Munk 1981;Ohno and Kako 1991), as well as treatments of isolated stalk explants (Gabryszewska and Saniewski 1983), led to the conclusion that these plant hormones originating in anthers, gynoecium, or developing fruit are largely responsible for peduncle elongation. Identification of endogenous hormones during flowering in the tulip (Okubo and Uemoto 1985;Xu and others 2008) and barley (Wolbang and others 2004) confirm that diffusible auxins from floral organs, in the first place, and in coordination with gibberellins are responsible for stalk elongation.…”

Section: Introductionmentioning

confidence: 99%

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Endogenous Auxin Profile in the Christmas Rose (Helleborus niger L.) Flower and Fruit: Free and Amide Conjugated IAA

Brcko

Pěnčík

Magnus

et al. 2011

J Plant Growth Regul

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The reproductive development of the Christmas rose (Helleborus niger L.) is characterized by an uncommon feature in the world of flowering plants: after fertilization the white perianth becomes green and photosynthetically active and persists during fruit development. In the flowers in which fertilization was prevented by emasculation (unfertilized) or entire reproductive organs were removed (depistillated), the elongation of the peduncle was reduced by 20-30%, and vascular development, particularly lignin deposition in sclerenchyma, was arrested. Chlorophyll accumulation in sepals and their photosynthetic efficacy were up to 80% lower in comparison to fertilized flowers. Endogenous auxins were investigated in floral and fruit tissues and their potential roles in these processes are discussed. Analytical data of free indole-3-acetic acid, indole-3-ethanol (IEt), and seven amino acid conjugates were afforded by LC-MS/MS in floral tissues of fertilized as well as unfertilized and depistillated flowers. Among amino acid conjugates, novel ones with Val, Gly, and Phe were identified and quantified in the anthers, and in the fruit during development. Reproductive organs before fertilization followed by developing fruit at post-anthesis were the main source of auxin. Tissues of unfertilized and depistillated flowers accumulated significantly lower levels of auxin. Upon depistillation, auxin content in the peduncle and sepal was decreased to 4 and 45%, respectively, in comparison to fruit-bearing flowers. This study suggests that auxin arising in developing fruit may participate, in part, in the coordination of the Christmas rose peduncle elongation and its vascular development.

show abstract

Section: Resultssupporting

confidence: 82%

Section: Impact On Peduncle Elongation and Vascular Anatomymentioning

confidence: 53%

Section: Free Iaa Profilementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Endogenous Auxin Profile in the Christmas Rose (Helleborus niger L.) Flower and Fruit: Free and Amide Conjugated IAA

Brcko

Pěnčík

Magnus

et al. 2011

J Plant Growth Regul

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“…processes, namely flower bud development and flower stalk elongation which are closely interrelated (11).…”

mentioning

confidence: 99%

Microsporogenesis and Flower Bud Blasting as Affected by High Temperature and Gibberellic Acid in Cymbidium(Orchidaceae).

Ohno

1991

Engei Gakkai zasshi

Self Cite

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Plant growth regulators and the orchid cut-flower industry

Hew

Clifford²

1993

Plant Growth Regul

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Research involving plant growth regulators (PGRs) and orchids in areas of orchid growth and development are reviewed . For all areas covered in the review -seed germination and seedling growth, lateral shoot production, root production, flower initiation and development, postharvest physiology, and photosynthate partitioning -it was concluded that further studies would assist in clarifying potential uses for PGRs in the orchid cut-flower industry . It is suggested that extra PGR research on orchids is justified at the present time because of favourable prospects facing the orchid cut-flower industry .

show abstract

Roles of Floral Organs and Phytohormones in Flower Stalk Elongation of Cymbidium(Orchidaceae).

Cited by 6 publications

References 10 publications

Endogenous Auxin Profile in the Christmas Rose (Helleborus niger L.) Flower and Fruit: Free and Amide Conjugated IAA

Endogenous Auxin Profile in the Christmas Rose (Helleborus niger L.) Flower and Fruit: Free and Amide Conjugated IAA

Microsporogenesis and Flower Bud Blasting as Affected by High Temperature and Gibberellic Acid in Cymbidium(Orchidaceae).

Plant growth regulators and the orchid cut-flower industry

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