scholarly journals Inhibitory Effect of Naphthylphthalamic Acid (NPA) on Stem Growth Induced by Auxin in Precooled Tulip Bulbs

10.5109/24250 ◽  
1998 ◽  
Vol 43 (1/2) ◽  
pp. 59-66
Author(s):  
Marian Saniewski ◽  
Hiroshi Okubo
Keyword(s):  
Inhibitory Effect ◽  
Stem Growth ◽  
Naphthylphthalamic Acid ◽  
Tulip Bulbs

scholarly journals Methyl Jasmonate Induces Gum and Inhibits Stem Growth Promoted by Auxin in Uncooled Tulip Bulbs

10.5109/4620 ◽  
2005 ◽  
Vol 50 (1) ◽  
pp. 41-47
Author(s):  
Marian Saniewski ◽  
Junichi Ueda ◽  
Kensuke Miyamoto ◽  
Hiroshi Okubo ◽  
Jerzy Puchalski
Keyword(s):  
Methyl Jasmonate ◽  
Stem Growth ◽  
Tulip Bulbs

Auxin regulation of gibberellin biosynthesis in the roots of pea (Pisum sativum)

2009 ◽  
Vol 36 (4) ◽  
pp. 362 ◽  
Author(s):  
Diana E. Weston ◽  
James B. Reid ◽  
John J. Ross
Keyword(s):  
Pisum Sativum ◽  
Inhibitory Effect ◽  
Gibberellin Biosynthesis ◽  
Growth Inhibitory ◽  
Auxin Regulation ◽  
Auxin Transport Inhibitor ◽  
Naphthylphthalamic Acid ◽  
Pea Roots ◽  
High Auxin ◽  
Ga Biosynthesis

Auxin promotes GA biosynthesis in the aboveground parts of plants. However, it has not been demonstrated previously that this interaction occurs in roots. To understand the interactions between auxin and GAs in these organs, we treated wild-type pea (Pisum sativum L.) roots with the inhibitors of auxin action, p-chlorophenoxyisobutyric acid (PCIB) and yokonolide B (YkB), and with the auxin transport inhibitor N-1-naphthylphthalamic acid (NPA). These compounds generally downregulated GA synthesis genes and upregulated GA deactivation genes, and reduced the level of the bioactive GA1. These effects indicate that in pea roots, auxin at normal endogenous levels stimulates GA biosynthesis. We show also that supra-optimal levels of exogenous auxin reduce the endogenous level of bioactive GA in roots, although the effect appears too small to account for the strong growth-inhibitory effect of high auxin levels.

scholarly journals Effects of sugars on the growth and chlorophyll content in excised tulip stem in the presence of Indole-3-acetic acid

2012 ◽  
Vol 20 (1) ◽  
pp. 97-114 ◽  
Author(s):  
Elżbieta Węgrzynowicz-Lesiak ◽  
Marian Saniewski ◽  
Justyna Góraj ◽  
Marcin Horbowicz ◽  
Kensuke Miyamoto ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Chlorophyll Content ◽  
Inhibitory Effect ◽  
Flower Bud ◽  
Chlorophyll Contents ◽  
Delayed Senescence ◽  
Sugar Response ◽  
Tulip Bulbs ◽  
Indole 3 Acetic Acid ◽  
Stem Segments

ABSTRACT The purpose of this study was to clarify the effect of sucrose on auxin-induced growth of stem excised from growing tulips and excised directly from cooled and not cooled bulbs, and on the growth of excised IV internode from growing plants in the presence of auxin. In all cases flower bud was replaced by IAA (indole-3- acetic acid, 0.1%, w/w in lanolin) and basal part of excised segments of stem was kept in distilled water or in solution of various sugars at different concentrations. IAA-induced growth of excised stems isolated from growing tulips was inhibited by sucrose at concentrations of 5.0% and 10.0%, but sucrose at 1.25% and 2.5% did not. Sucrose at all concentrations used evidently delayed senescence and increased chlorophyll contents in excised stems in the presence of IAA. Sucrose induced stiffing in isolated stems in the presence of IAA, and much less infective by pathogen in comparison to stem treated with IAA only. Mannitol and sorbitol at concentrations of 5.0% and 10.0% substantially inhibited IAA-induced growth of stem segments. Stem segments excised from cooled and not cooled tulip bulbs were more sensitive than those isolated from growing shoots due to application of sucrose and glucose; more inhibitory effect was observed. Sucrose at concentrations of 5.0% and 10.0% only slightly inhibited growth of IV internode treated with IAA and all concentrations of sucrose (1.25%, 2.5%, 5.0% and 10.0%) substantially increased chlorophyll content. The possible mode of actions of sucrose interacting with auxin to regulate stem growth is also discussed although sugar response is complicated by the fact that plants have multiple sugar-response pathways.

Cadmium Inhibits Lateral Root Emergence in Rice by Disrupting OsPIN-Mediated Auxin Distribution and the Protective Effect of OsHMA3

2020 ◽  
Author(s):  
Han-Qing Wang ◽  
Wei Xuan ◽  
Xin-Yuan Huang ◽  
Chuanzao Mao ◽  
Fang-Jie Zhao
Keyword(s):  
Protective Effect ◽  
Lateral Root ◽  
Lateral Roots ◽  
Subsequent Development ◽  
Rice Cultivar ◽  
Inhibitory Effect ◽  
Auxin Distribution ◽  
Naphthylphthalamic Acid ◽  
Functional Alleles ◽  
Auxin Polar Transport

Abstract Cadmium (Cd) strongly inhibits root growth, especially the formation of lateral roots (LRs). The mechanism of Cd inhibition on LR formation in rice (Oryza sativa) remains unclear. In this study, we found that LR emergence in rice was inhibited significantly by 1 µM Cd and almost completely arrested by 5 µM Cd. Cd suppressed both the formation and subsequent development of the lateral root primordium (LRP). By using transgenic rice expressing the auxin response reporters DR5::GUS and DR5rev::VENUS, we found that Cd markedly reduced the auxin levels in the stele and LRP. Cd rapidly downregulated the expression of the auxin efflux transporter genes OsPIN1b, OsPIN1c and OsPIN9 in the stele and LRP. The emergence of LRs in a rice cultivar with a null allele of OsHMA3 (Heavy Metal ATPase 3) was more sensitive to Cd than cultivars with functional alleles. Overexpression of functional OsHMA3 in rice greatly alleviated the inhibitory effect of Cd, but the protective effect of OsHMA3 was abolished by the auxin polar transport inhibitor 1-N-naphthylphthalamic acid. The results suggest that Cd inhibits LR development in rice by disrupting OsPIN-mediated auxin distribution to LRP and OsHMA3 protects against Cd toxicity by sequestering Cd into the vacuoles.

scholarly journals The effect of chitosan on limitation of growth and development of some pathogenic fungi for ornamental plants

2013 ◽  
Vol 54 (1) ◽  
pp. 17-29 ◽  
Author(s):  
Alicja Saniewska
Keyword(s):  
Fusarium Oxysporum ◽  
Inhibitory Action ◽  
Marked Effect ◽  
Ornamental Plants ◽  
Pathogenic Fungi ◽  
Inhibitory Effect ◽  
Crab Shell ◽  
Necrotic Spots ◽  
Tulip Bulbs

The inhibitory effect of crab-shell chitosan, medium (200-800 cps) and high molecular weight ( 800-2000 cps) (purchased from Sigma-Aldrich Chemicals) toward <i>Alternaria alternata, Botrytis tulipae, Fiisarium oxysporum</i> f. sp. <i>callistephi, Fusarium oxysporum</i> f. sp. <i>tulipae, Phoma narcissi</i> and <i> Phoma poolensis</i> was evaluated <i>in vitro</i> and in <i>vivo</i>. The chitosan evidently inhibited in vitro growth of all tested pathogens, with a marked effect at higher concentrations above 200 μg/cm<sup>3</sup>. Chitosan at a concentration of 1,25; 2,5 and 5,0 mg/cm<sup>3</sup> didn't have inhibitory action in appearance of fungi growth on naturally contaminated <i>Callistephus chinensis</i> seeds. At the same concentrations, chitosan applied as bulb scales dressing of <i>Hymenocallis narcissiflora</i> bulbs, before inoculation or after inoculation with <i>Phoma narcissi</i>, inhibited the development of necrotic spots on scales. Chitosan used preventively or curatively at a concentrations of 1,25; 2,5 and 5,0 mg/cm<sup>3</sup> indicated inhibitory effect on development of <i>Fusarium oxysporum</i> f. sp. <i>tulipae</i> on tulip bulbs. Chitosan at a concentration of 10 mg/cm<sup>3</sup> applied preventively (first spray 12th June) was very effective in the control of <i>Puccinia antirrhini</i> on snapdragon in the field. The strongest inhibitory effect was observed on snapdragon treated 8 times at week intervals.

scholarly journals The effect of Medicago arabica, M. hybrida and M. sativa saponins on the growth and development of Fusarium oxysporum Schlecht f. sp. tulipae apt.

2012 ◽  
Vol 61 (2) ◽  
pp. 147-155 ◽  
Author(s):  
Anna Jarecka ◽  
Alicja Saniewska ◽  
Zbigniew Biały ◽  
Marian Jurzysta
Keyword(s):  
Fusarium Oxysporum ◽  
Growth And Development ◽  
Inhibitory Effect ◽  
Mycelium Growth ◽  
Medicagenic Acid ◽  
Colony Forming Units ◽  
Tulip Bulbs

In the present work it was shown that total saponins originated from <i>M. hybrida</i> and <i>M. sativa</i> substantially limited mycelium growth of <i>F. oxysporum</i> f. sp. <i>tulipae</i> and symptoms of fusariosis on tulip bulbs. Out of 15 individual tested saponins originated from <i>M. arabica</i>, <i>M. hybrida</i> and <i>M. sativa</i>, four compounds: 3-<i>O</i>-[β-D-glucopyranosyl (1→2)α-L-arabinopyranosyl] hederagenin, hederagenin 3-<i>O</i>-β-D-glucopyranoside, medicagenic acid, medicagenic acid 3-<i>O</i>-β-D-glucopyranoside had the strongest inhibitory effect on mycelium growth of <i>Fusarium oxysporum</i> f. sp. <i>tulipae</i> on PDA medium. The total saponins from <i>M. arabica</i>, <i>M. hybrida</i> and <i>M. sativa</i> inhibited the number of colony forming units of <i>Fusarium oxysporum</i> f. sp. <i>tulipae</i> in artificially infested substrate. The use of saponins originated from <i>Medicago</i> as a fungicide is suggested.

Effect of morphactin on stem growth in relation to auxin in precooled rooted tulip bulbs

1999 ◽  
Vol 21 (2) ◽  
pp. 167-174 ◽  
Author(s):  
Marian Saniewski ◽  
Hiroshi Okubo ◽  
Jerzy Puchalski
Keyword(s):  
Stem Growth ◽  
Tulip Bulbs

Inhibitory effect of melatonin on nitric oxide synthase in rat enteric nervous system

2001 ◽  
Vol 120 (5) ◽  
pp. A176-A176
Author(s):  
P KOPPITZ ◽  
M STORR ◽  
D SAUR ◽  
M KURJAK ◽  
H ALLESCHER
Keyword(s):  
Nitric Oxide ◽  
Nervous System ◽  
Nitric Oxide Synthase ◽  
Enteric Nervous System ◽  
Inhibitory Effect ◽  
Oxide Synthase

Inhibitory effect of proton pump inhibitors against chemotaxis of Helicobacter pylori

2001 ◽  
Vol 120 (5) ◽  
pp. A655-A656
Author(s):  
H NAKAMURA ◽  
H YOSHIYAMA ◽  
H YANAI ◽  
M SHIRAL ◽  
T NAKAZAWA ◽  
...  
Keyword(s):  
Helicobacter Pylori ◽  
Proton Pump Inhibitors ◽  
Proton Pump ◽  
Inhibitory Effect
Sign in / Sign up

Export Citation Format

Share Document