A Plant Growth Retardant, Uniconazole, Is a Potent Inhibitor of ABA Catabolism in<i>Arabidopsis</i>

Saito, Shigeki; Okamoto, Masanori; Shinoda, Satoshi; Kushiro, Toshio; Koshiba, Tomokazu; Kamiya, Yûji; Hirai, Nobuhiro; Todoroki, Yasushi; Sakata, Kanzo; Nambara, Eiji; Mizutani, Masaharu

doi:10.1271/bbb.60077

Cited by 109 publications

(71 citation statements)

References 30 publications

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“…It was known that abscisic acid repressed the activity and signalling of gibberellin that induced α-amylase during seed germination in cereals (Ishibashi et al 2012). In arabidopsis, the level of endogenous abscisic acid increased about two folds as compared to control by application of uniconazol (Saito et al 2008). In this study, interaction between paclobutrazol and blue light on α-amylase activity was evaluated in the germinated black rice seeds.…”

Section: α-Amylase Activitymentioning

confidence: 96%

EFFECTS OF BLUE LIGHT AND PACLOBUTRAZOL ON SEED GERMINATION, VEGETATIVE GROWTH AND YIELD OF BLACK RICE (Oryza sativa L. 'Cempo Ireng')

Dewi

Agustina²,

Nurmalika³

2017

BIOTROPIA

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Black rice (Oryza sativa L. "Cempo Ireng") is one of local rice varieties in Sleman Regency, Yogyakarta. The black color is caused by high anthocyanin content which is important source of antioxidant. The cultivation of black rice is still limited due to its tall phenotype, long vegetative stage and low productivity compared to white rice. Paclobutrazol is a growth retardant causing dwarfing in several crop plants and reducing lodging. Blue light can improve plant quality. This research was aimed to evaluate the effect of blue light and paclobutrazol on seed germination, vegetative growth and yield of black rice. The results showed that the average of seed germination as well as the activity of α-amylase of seeds subjected to blue light were lower compared to those subjected to sunlight; however, paclobutrazol concentrations did not affect seed germination percentage. The height of rice plants treated with paclobutrazol decreased in accordance with the increase of paclobutrazol concentration. Chlorophyll content and tiller numbers increased by paclobutrazol treatment of 12.5 ppm. Nitrate reductase activity was higher in rice seedlings subjected to blue light compared to those subjected to sunlight. Iron (Fe) content of rice plants treated with 25 or 50 ppm paclobutrazol increased compared to control. It was concluded that paclobutrazol application of 12.5 ppm already reduced plant height. The higher concentration of paclobutrazol applied the greater reduction on plant height was observed. Blue light treatment applied during black rice seed germination slightly reduced germination percentage and α-amylase activity in the germinated seeds. However, blue light treatment combined with paclobutrazol application during black rice seed germination increased chlorophyll content, tiller numbers and Fe content in black rice grain.

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Section: α-Amylase Activitymentioning

confidence: 96%

EFFECTS OF BLUE LIGHT AND PACLOBUTRAZOL ON SEED GERMINATION, VEGETATIVE GROWTH AND YIELD OF BLACK RICE (Oryza sativa L. 'Cempo Ireng')

Dewi

Agustina²,

Nurmalika³

2017

BIOTROPIA

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“…For example, uniconazole-P can affect the biosynthesis of GA and BR, as well as the deactivation of abscisic acid. 14,15 Therefore, secondary effects of TIS108 may also play a role in plants, but Figure 1 indicates that TIS108 treatment resulted in few morphological changes, except for the bushy phenotype at 3 μM levels of several genes related to SL biosynthesis, such as MAX3 (At2g44990) and MAX4 (At4g32810), were upregulated in several SL-biosynthesis and SL-insensitive mutants. 3,4,13 On the basis of these results, we examined the mRNA levels of two SL-biosynthesis genes (MAX3 and MAX4) and a SL-signaling (MAX2) gene in Arabidopsis roots grown in the presence of TIS108 using real-time quantitative RT-PCR.…”

Section: Effects Of Strigolactone-biosynthesis Inhibitor Tis108 On Armentioning

confidence: 99%

Effects of strigolactone-biosynthesis inhibitor TIS108 onArabidopsis

Ito

Umehara

Hanada

et al. 2013

Plant Signaling & Behavior

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Strigolactones (SLs) are terpenoid lactones produced in many plant species and have various functions: germination stimulants of root parasitic weeds, root-derived signals that induce hyphal branching in arbuscular mycorrhizal fungi, and a plant hormone that inhibits shoot branching and regulates root morphology. [1][2][3][4] In the past, several branching mutants have been identified as SL biosynthesis and signaling mutants. To date, it is known that the biosynthesis of SLs is controlled by one b-carotene isomerase (D27), two carotenoid cleavage dioxygenases, CCD7 (MAX3, RMS5 D17/ HTD1, DAD3) and CCD8 (MAX4, RMS1, D10, DAD1) and one cytochrome P450 monooxygenase (MAX1). [5][6][7] More recently, Alder et al. reported that three enzymes, D27, CCD7 and CCD8, produce an SL-like chemical named carlactone from b-carotene in vitro and proposed a SL-biosynthesis pathway. 7 However, the enzymatic function of MAX1 has not been uncovered.As described above, at least one step of SL biosynthesis is thought to be mediated by one cytochrome P450 enzyme, 8 and therefore P450 inhibitors may inhibit SL biosynthesis in Arabidopsis. Previously, we chose triazole derivatives as these have been shown to act as efficient inhibitors of P450 monooxygenase and reported two SL-biosynthesis inhibitors, 2,2-dimethyl-7-phenoxy-4-(1H-1,2,4-triazol-1-yl)heptan-3-ol (TIS13) 9 and 6-phenoxy-1-phenyl-2-(1H-1,2,4-triazol-1-yl) hexan-1-one (TIS108) 10 ( Fig. 1A). Although TIS13 inhibits the production of epi-5DS, which is a major SL, in rice, TIS13-treated plants show a severe dwarf phenotype which does not recover following the application of SL; this suggests the possibility that TIS13 inhibits the biosynthesis of other plant hormones such as gibberellin (GA) and/or brassinosteroid (BR). 9 To develop specific SL-biosynthesis inhibitors, a structure-activity relationship study on TIS13 derivatives tiS108 is a triazole-type strigolactone (SL)-biosynthesis inhibitor that reduces the level of 2'-epi-5-deoxystrigol (epi-5DS) in rice. here we report the effects of tiS108 on Arabidopsis. treatment of tiS108 increased the number of branches and repressed root hair elongation as was observed in SL-deficient mutants, and co-application of Gr24, a synthetic SL analog, recovered the tiS108-induced phenotype to that of wild-type. in addition, MaX3 and MaX4 genes in the SL-biosynthesis pathway were upregulated in tiS108-treated Arabidopsis, probably due to feedback regulation caused by SL deficiency. these results indicate that tiS108 is an effective tool for regulating SL production in Arabidopsis. Keywords: plant hormone, strigolactone, plant growth regulator, biosynthesis inhibitor, Arabidopsis was performed by estimating the level of epi-5DS and growth retardation in rice, which led to the identification of a specific SL-biosynthesis inhibitor, TIS108 10 ( Fig. 1). However, it is unclear whether TIS108 inhibits the production of SLs in Arabidopsis. In this study, to identify the effect of TIS108 on SL function in Arabidopsis, we examined the morphological...

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“…Growth regulator is any of various synthetic or naturally occurring plant substances (as an auxin or gibberellin) that regulate growth, while, a growth retardant is a chemical which causes reduction in height or volume of trees without a reduction in yield (SAITO et al, 2006). Gibberellins appear to be the most active growth hormones for regulating flowering in mango trees and other fruit tree crops.…”

Section: Introductionmentioning

confidence: 99%

Floral induction management in 'Palmer' mango using uniconazole

et al. 2016

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The objective of this study was to evaluate the effects of different doses of uniconazole (UCZ) on 'Palmer RESUMO Este trabalho teve como objetivo avaliar a eficiência da aplicação de diferentes doses de uniconazole (UCZ) em mangueira 'Palmer' no comportamento vegetativo, reprodutivo e nas características físicas, químicas e produtivas dos frutos durante o período de entressafra na região Norte de Minas Gerais. O delineamento experimental foi em blocos ao acaso, testandose as doses 0,0; 1,0; 1,0+1,0 (2,0)

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A Plant Growth Retardant, Uniconazole, Is a Potent Inhibitor of ABA Catabolism inArabidopsis

Cited by 109 publications

References 30 publications

EFFECTS OF BLUE LIGHT AND PACLOBUTRAZOL ON SEED GERMINATION, VEGETATIVE GROWTH AND YIELD OF BLACK RICE (Oryza sativa L. 'Cempo Ireng')

EFFECTS OF BLUE LIGHT AND PACLOBUTRAZOL ON SEED GERMINATION, VEGETATIVE GROWTH AND YIELD OF BLACK RICE (Oryza sativa L. 'Cempo Ireng')

Effects of strigolactone-biosynthesis inhibitor TIS108 onArabidopsis

Floral induction management in 'Palmer' mango using uniconazole

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