scholarly journals A GROWTH INHIBITOR FOUND IN CENTAUREA SPP.

1963 ◽  
Vol 43 (4) ◽  
pp. 475-481 ◽  
Author(s):  
R. A. Fletcher ◽  
A. J. Renney
Keyword(s):  
Indole Derivative ◽  
Growth Inhibitor ◽  
Seedling Development ◽  
Centaurea Maculosa ◽  
Centaurea Diffusa ◽  
Plant Parts ◽  
Chromatographic Techniques ◽  
Toxic Material ◽  
Centaurea Repens ◽  
Plant Growth Inhibitor

The growth of tomato and barley plants was inhibited in soils naturally infested with knapweed or in soils artificially infested with powdered knapweed residues. The leaves contained a higher proportion of the toxic material than did other plant parts, and the leaves of Centaurea repens L. were more inhibitory than those of Centaurea diffusa Lam. and Centaurea maculosa Lam. Chromatographic techniques were developed to isolate an inhibitor common to the three species which was soluble in both water and ether, and inhibitory to the seedling development of barley and lettuce. The material was relatively more inhibitive to root development than to the top growth of the species tested. Chromogenic sprays and ultraviolet absorption spectra indicated that the inhibitor was an indole derivative. The presence of a plant growth inhibitor in these Centaureas may partially explain their rapid establishment in almost pure stands.

scholarly journals Discovery, characterization and functional improvement of kumamonamide as a novel plant growth inhibitor that disturbs plant microtubules

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Takashi Ishida ◽  
Haruna Yoshimura ◽  
Masatsugu Takekawa ◽  
Takumi Higaki ◽  
Takashi Ideue ◽  
...  
Keyword(s):  
Plant Growth ◽  
Human Life ◽  
Growth Inhibitor ◽  
Herbicidal Activity ◽  
Functional Improvement ◽  
Microtubule Inhibitors ◽  
Plant Microtubules ◽  
Plant Growth Inhibitor ◽  
Derivatives Of ◽  
Synthetic Intermediate

AbstractThe discovery and useful application of natural products can help improve human life. Chemicals that inhibit plant growth are broadly utilized as herbicides to control weeds. As various types of herbicides are required, the identification of compounds with novel modes of action is desirable. In the present study, we discovered a novelN-alkoxypyrrole compound, kumamonamide fromStreptomyces werraensisMK493-CF1 and established a total synthesis procedure. Resulted in the bioactivity assays, we found that kumamonamic acid, a synthetic intermediate of kumamonamide, is a potential plant growth inhibitor. Further, we developed various derivatives of kumamonamic acid, including a kumamonamic acid nonyloxy derivative (KAND), which displayed high herbicidal activity without adverse effects on HeLa cell growth. We also detected that kumamonamic acid derivatives disturb plant microtubules; and additionally, that KAND affected actin filaments and induced cell death. These multifaceted effects differ from those of known microtubule inhibitors, suggesting a novel mode of action of kumamonamic acid, which represents an important lead for the development of new herbicides.

Xanthoxin, a recently discovered plant growth inhibitor

1972 ◽  
Vol 180 (1060) ◽  
pp. 317-346 ◽  
Keyword(s):  
Plant Growth ◽  
Growth Inhibitor ◽  
Wheat Coleoptile ◽  
Spectroscopic Techniques ◽  
Plant Growth Inhibitor ◽  
Coleoptile Section ◽  
Cress Seed ◽  
Aba Content ◽  
Seed Germination Test

The naturally occurring plant growth inhibitor xanthoxin which was discovered in these laboratories has been prepared in vitro by the oxidation of the pigment violaxanthin with neutral zinc permanganate solution. By the use of chemical and spectroscopic techniques, xanthoxin has been characterized as a mixture of the 2- cis , 4- trans - and 2- trans , 4- trans -isomers of 5-(1', 2', -epoxy-4'-hydroxy-2', 6', 6'-tri-methyl-1'-cyclohexy)-3-methyl-pentadienal. These are also obtained by similar oxidations of neoxanthin, antheraxanthin and lutein epoxide. Cis, trans -xanthoxin probably arises from the corresponding cis -xanthophyll and its conversion to ( + )-ABA by simple chemical procedures is reported. The biological activity of cis, trans -xanthoxin has been shown to be considerably greater than that of the trans, trans -isomer. It is comparable with that of ( ± )-ABA in the wheat coleoptile section, the lettuce hypocotyl and bean petiole abscission tests, but greater than that of ( ± )-ABA in the cress seed germination test. Xanthoxin is shown to antagonize the growth-promoting effects of the plant hormones 3-indolylacetic acid, gibberellic acid and kinetin. Other xanthoxin derivatives have been prepared and their activities in several tests are also reported. The uptake of xanthoxin by tomato shoots leads to a subsequent large increase in the ABA content of the tissue. Evidence is presented for a possible biogenetic conversion of cis, trans -xanthoxin into ( + )-ABA by plants.

scholarly journals (+)-Isoamericanol A: A Plant Growth Inhibitor From Heliotropium indicum

2019 ◽  
Vol 14 (5) ◽  
pp. 1934578X1984578
Author(s):  
Sirinapa Chaipon ◽  
Sutjaritpan Boonmee ◽  
Arihiro Iwasaki ◽  
Kiyotake Suenaga ◽  
Hisashi Kato-Noguchi
Keyword(s):  
Plant Growth ◽  
Inhibitory Activity ◽  
Growth Inhibitor ◽  
Allelopathic Effect ◽  
Inhibitory Substance ◽  
Growth Inhibitory ◽  
Growth Inhibitory Activity ◽  
Plant Growth Inhibitor ◽  
Heliotropium Indicum ◽  
Allelopathic Substance

A plant growth inhibitory substance was isolated from Heliotropium indicum by bioassay-guided purification and characterized to be (+)-isoamericanol A. (+)-Isoamericanol A significantly inhibited seedling growth of cress at a concentration greater than 0.1 mM. The concentrations of (+)-isoamericanol A required for 50% growth inhibition of cress roots and hypocotyls were 0.5 and 0.4 mM, respectively. This inhibition indicates that (+)-isoamericanol A had a growth inhibitory activity and may contribute to the allelopathic effect of H. indicum. This report is the first on the plant growth inhibitory activity of (+)-isoamericanol A as an allelopathic substance.

Isolation and Structure of Fasciculol A, a New Plant Growth Inhibitor fromNeamatoloma fasciculare†,††

1977 ◽  
Vol 41 (8) ◽  
pp. 1539-1541 ◽  
Author(s):  
Michimasa Ikeda ◽  
Yoshifumi Sato ◽  
Masaharu Izawa ◽  
Takeshi Sassa ◽  
Yukichi Miura
Keyword(s):  
Plant Growth ◽  
Growth Inhibitor ◽  
Plant Growth Inhibitor

scholarly journals Antioxidant and the Dwarfing Candidate Gene of “Nantongxiaofangshi” (Diospyros kaki Thunb.)

2019 ◽  
Vol 2019 ◽  
pp. 1-14
Author(s):  
Yuhan Dong ◽  
Peihong Wang ◽  
Mengting Jiang ◽  
Shenchun Qu
Keyword(s):  
Antioxidant Activity ◽  
Functional Role ◽  
Growth Inhibitor ◽  
Signal Transduction Pathways ◽  
Diospyros Kaki ◽  
Phenological Stages ◽  
Related Research ◽  
Plant Growth Inhibitor ◽  
The Relationship

The aims of this work were to identify genes related to dwarfing for subsequent dwarfing-related research in persimmon and evaluate the relationship between antioxidant activity, dwarf, and hormones of persimmon trees for analyzing the possible dwarf mechanism oxidation factors. In the present study, a transcriptome analysis of “Nantongxiaofangshi” was used to identify and clone 22 candidate genes related to gibberellin signal transduction pathways and synthetic pathway. The expression of these genes was assessed in two persimmon cultivars, “Dafangshi” and “Nantongxiaofangshi,” by RT-qPCR at different phenological stages and in response to the exogenous application of GA3 (GA treatment) and PAZ (paclobutrazol, a plant growth inhibitor, also called PP333). The results revealed differential expression of 14 of these 22 genes in the two varieties. Subsequently, endogenous hormone levels were assessed of the two varieties, along with the number of internodes and internode length. The results suggested that the persimmon could be used as a valuable and powerful natural candidate for providing information on the functional role of dwarfing.

Seasonal Variation in pH, Carbohydrate and Nitrogen of Xylem Exudation of Vitis vinifera

1996 ◽  
Vol 23 (1) ◽  
pp. 115 ◽  
Author(s):  
JA Campbell ◽  
S Strother
Keyword(s):  
Seasonal Variation ◽  
Vitis Vinifera ◽  
Growth Inhibitor ◽  
Vitis Vinifera L ◽  
Ph Variation ◽  
Xylem Exudate ◽  
Carbohydrate Concentration ◽  
Plant Growth Inhibitor ◽  
Zero Values ◽  
Xylem Exudation

Over two seasons, 1989 and 1990, pH and carbohydrate concentration of the xylem exudate of Vitis vinifera L. var. Waltham Cross were examined around the time of budburst. During this period in 1990, weekly determinations of NH4+ and NO3- concentrations in xylem exudate were also performed. Over the 2 years, exudate pH varied inversely with daily exudate flow, falling from plateau levels of approximately pH 6.0 to lower than pH 5.5 around the date of greatest daily exudation, then rising again to a plateau of about pH 7.5. Exudate carbohydrate concentration variations were also consistent over the 2 years of the study, falling from plateau values of approximately 120 mg glucose equivalents L-1 (approximately 660 μM) at or immediately prior to the date of maximal exudation flow, to zero values within 4 weeks. These data, as well as reflecting a mobilisation of stored carbohydrates to apical tissues prior to budburst, also concur with previously observed activities of an apparently carbohydrate plant growth inhibitor in grapevine exudate. Exudate NH4+ and NO3- concentrations both increased directly with exudate flow up to the date of maximal daily exudation, then fell again to lower levels. Unlike seasonal pH variation, NH4+ and NO3- concentrations were not significantly correlated to daily exudate volume. The seasonal variations in pH infer a flow-dependent mobilisation from storage tissues, the reasons for which at budburst are discussed.

cis-Cinnamoyl Glucoside as a Major Plant Growth Inhibitor Contained in Spiraea prunifolia

2005 ◽  
Vol 46 (2) ◽  
pp. 125-131 ◽  
Author(s):  
Sayaka Morita ◽  
Syuntaro Hiradate ◽  
Yoshiharu Fujii ◽  
Jiro Harada
Keyword(s):  
Plant Growth ◽  
Growth Inhibitor ◽  
Plant Growth Inhibitor
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