Transient accumulation of .ALPHA.-ketol linolenic acid (KODA) in immature flower buds of some ornamental plants

Yokoyama, Mineyuki; Yamaguchi, Syuhei; Iida, Toshii; Suda, A.; Saeda, Tsuyoshi; Miwa, Toshiki; Kiyohisa, Ujihara; Nishio, J.

doi:10.5511/plantbiotechnology.22.201

Cited by 11 publications

(9 citation statements)

References 21 publications

(19 reference statements)

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“…Violet 3 and in immature flower buds of Dianthus caryophyllus L., Dendranthema grandiflorum Kitam, and Eustoma russellianum Griseb. 4 P. nil, an well-known model plant for flowering-studies, is classified as a short-day plant which develops flower buds when cotyledons of 4-to 5-days old seedlings are exposed to a single 16 h dark period. 4 We have earlier reported that the endogenous level of 1 in cotyledons of P. nil seedlings sharply increased when the seedlings were grown under the continuous dark conditions for 16 h, and dropped rapidly to the basal level by an exposure of light at the end of the flower-inducing dark period.…”

Section: Introductionmentioning

confidence: 99%

“…4 P. nil, an well-known model plant for flowering-studies, is classified as a short-day plant which develops flower buds when cotyledons of 4-to 5-days old seedlings are exposed to a single 16 h dark period. 4 We have earlier reported that the endogenous level of 1 in cotyledons of P. nil seedlings sharply increased when the seedlings were grown under the continuous dark conditions for 16 h, and dropped rapidly to the basal level by an exposure of light at the end of the flower-inducing dark period. Flower bud formation was also correlated with elevated levels of 1 within 11 h to 16 h following the start of inductive dark period.…”

Section: Introductionmentioning

confidence: 99%

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Enantio-selective reduction of the flowering related compound KODA and its analogues in Pharbitis nil cv. Violet

et al. 2012

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Plant oxylipins are an important class of signaling molecules in plants. The cyclic adducts of epinephrine or norepinephrine with the naturally occurring oxylipin (12Z,15Z)-9-hydroxy-10oxo-octadeca-12,15-dienoic acid (KODA, 1) or its synthetic analogues (2-6) have been reported to possess flower-inducing activity towards Lemna paucicostata. By in vivo and in vitro experiments with seedlings of Pharbitis nil cv. Violet carbonyl groups of the -ketols (1 and 3) and the ketones (7 and 9) were enantio-selectively reduced to give their corresponding vicinal diols (2 and 4) and alcohols (8 and 10). The stereo-chemistry at the oxymethine carbon was determined based on the long-range C-H coupling constants and the modified Mosher's method. Orientation of the adjacent hydroxyl group in (1 and 3) did not affect the enantioselectivity, whereas the conversion was slightly affected and higher yields were obtained with the R enantiomers of the -ketols.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enantio-selective reduction of the flowering related compound KODA and its analogues in Pharbitis nil cv. Violet

et al. 2012

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“…Other endogenous hormones [9,10-ketol-octadecadienoic acid (KODA) and jasmonic acid (JA)] have been found at high concentrations in apple trees when GAs are low (blossom-thinned trees) and at low concentrations when GAs are high (heavily bearing trees). KODA and JA are associated with flower induction in other plants and may promote floral initiation in apple (Kittikorn et al, 2010(Kittikorn et al, , 2011Kong et al, 2005;Suzuki et al, 2003;Yokoyama et al, 2000Yokoyama et al, , 2005.…”

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A Novel Framework to Consider Endogenous Hormonal Control of Apple Tree Flowering

Pellerin¹,

Buszard²,

Georgallas³

et al. 2012

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Inhibition of flower initiation by nearby developing fruits is one of the main causes of biennial bearing in apple trees. This localized inhibition may depend on a critical ratio of inhibitor and promoter hormones that inhibits flowering of apical meristems. A model is proposed to explain this phenomenon. In the model, it is assumed that seeds and leaves act as point sources and export inhibiting and promoting hormones to apical meristems. The model assumes critical ratios of promoting and inhibiting hormones determine whether an apical meristem flowers or not and this may be a cause of biennial bearing. Thus, the spatial arrangement of shoot apical meristems on a limb is perhaps critical in determining whether meristems initiate flower clusters. This article presents a novel framework to view the hormone hypotheses of biennial bearing in apple trees and how management strategies such as flower removal could be used to achieve regular numbers of flower clusters over consecutive years.

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“…Recently, it was shown that 9,10-ketol-octadecadienoic acid (KODA) is related to flower induction of Lemna paucicostata and Pharbitis nil (Yokoyama et al 2000;Suzuki et al 2003). The transient elevation of the endogenous KODA level during a dark period is also related to flower induction (Suzuki et al 2003;Yokoyama et al 2005). KODA is formed from 9-hydroxy-10-oxo-12 (Z), 15(Z)-octadecadienoic acid (9-HPOT) and is generated from linolenic acid by 9-lipoxygenase (9-LOX) (Fig.…”

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confidence: 98%

Effects of fruit load, shading, and 9,10-ketol-octadecadienoic acid (KODA) application on MdTFL1 and MdFT1 genes in apple buds

et al. 2010

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The effects of fruit load, shading, and 9, 10-ketol-octadecadienoic acid (KODA) application on the expression of MdTFL1 and MdFT1 genes were investigated in apples (Malus domestica Borkh.). The expression of MdTFL1 in apical buds from 21 to 63 days after full bloom (DAFB) in plants subjected to heavy crop treatment (HCT) was higher than that in plants subjected to flower thinning treatment (FTT). In contrast, the expression of MdFT1 did not show a clear difference between HCT and FTT. The shading treatment increased the expression of MdTFL1 at 35, 49, and 80 DAFB. However, MdFT1 did not show a clear difference between shading and non-shading treatments. KODA application decreased the expression of MdTFL1 at 49 DAFB, but it did not have a clear effect on the expression of MdFT1 from 21 to 91 DAFB. KODA application did not influence endogenous gibberellic acid (GA) concentrations in apical buds. These results show that KODA may be related to flower bud formation through its influence on MdTFL1. The relationship between KODA and GA with regard to the flower bud formation of apples was also discussed.

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Transient accumulation of .ALPHA.-ketol linolenic acid (KODA) in immature flower buds of some ornamental plants

Cited by 11 publications

References 21 publications

Enantio-selective reduction of the flowering related compound KODA and its analogues in Pharbitis nil cv. Violet

Enantio-selective reduction of the flowering related compound KODA and its analogues in Pharbitis nil cv. Violet

A Novel Framework to Consider Endogenous Hormonal Control of Apple Tree Flowering

Effects of fruit load, shading, and 9,10-ketol-octadecadienoic acid (KODA) application on MdTFL1 and MdFT1 genes in apple buds

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