scholarly journals Secondary metabolites from the endolichenic fungus Ophiosphaerella korrae

RSC Advances ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 4140-4149 ◽  
Author(s):  
Yue-Lan Li ◽  
Rong-Xiu Zhu ◽  
Gang Li ◽  
Ning-Ning Wang ◽  
Chun-Yu Liu ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Secondary Metabolites ◽  
Root Elongation ◽  
Endolichenic Fungus ◽  
Ophiosphaerella Korrae ◽  
New Metabolites

Six new metabolites were isolated from the endolichenic fungus Ophiosphaerella korrae. Ophiokorrin inhibited root elongation in the germination of Arabidopsis thaliana.

scholarly journals Two Expansin Genes, AtEXPA4 and AtEXPB5, Are Redundantly Required for Pollen Tube Growth and AtEXPA4 Is Involved in Primary Root Elongation in Arabidopsis thaliana

Genes ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 249
Author(s):  
Weimiao Liu ◽  
Liai Xu ◽  
Hui Lin ◽  
Jiashu Cao
Keyword(s):  
Arabidopsis Thaliana ◽  
Pollen Tube ◽  
Pollen Tube Growth ◽  
Cell Walls ◽  
Root Elongation ◽  
Expression Patterns ◽  
Primary Root ◽  
Pollen Grains ◽  
Tube Growth ◽  
Cell Wall Binding

The growth of plant cells is inseparable from relaxation and expansion of cell walls. Expansins are a class of cell wall binding proteins, which play important roles in the relaxation of cell walls. Although there are many members in expansin gene family, the functions of most expansin genes in plant growth and development are still poorly understood. In this study, the functions of two expansin genes, AtEXPA4 and AtEXPB5 were characterized in Arabidopsis thaliana. AtEXPA4 and AtEXPB5 displayed consistent expression patterns in mature pollen grains and pollen tubes, but AtEXPA4 also showed a high expression level in primary roots. Two single mutants, atexpa4 and atexpb5, showed normal reproductive development, whereas atexpa4atexpb5 double mutant was defective in pollen tube growth. Moreover, AtEXPA4 overexpression enhanced primary root elongation, on the contrary, knocking out AtEXPA4 made the growth of primary root slower. Our results indicated that AtEXPA4 and AtEXPB5 were redundantly involved in pollen tube growth and AtEXPA4 was required for primary root elongation.

Comparative Quantitative Trait Loci Mapping of Aliphatic, Indolic and Benzylic Glucosinolate Production in Arabidopsis thaliana Leaves and Seeds

Genetics ◽  
2001 ◽  
Vol 159 (1) ◽  
pp. 359-370 ◽  
Author(s):  
Daniel J Kliebenstein ◽  
Jonathan Gershenzon ◽  
Thomas Mitchell-Olds
Keyword(s):  
Arabidopsis Thaliana ◽  
Secondary Metabolites ◽  
Plant Environment ◽  
Aliphatic Glucosinolates ◽  
Glucosinolate Concentration ◽  
Indolic Glucosinolates ◽  
The Individual ◽  
Concentration Mapping ◽  
Indolic Glucosinolate ◽  
Aliphatic Glucosinolate

Abstract Secondary metabolites are a diverse set of plant compounds believed to have numerous functions in plant-environment interactions. Despite this importance, little is known about the regulation of secondary metabolite accumulation. We are studying the regulation of glucosinolates, a large group of secondary metabolites, in Arabidopsis to investigate how secondary metabolism is controlled. We utilized Ler and Cvi, two ecotypes of Arabidopsis that have striking differences in both the types and amounts of glucosinolates that accumulate in the seeds and leaves. QTL analysis identified six loci determining total aliphatic glucosinolate accumulation, six loci controlling total indolic glucosinolate concentration, and three loci regulating benzylic glucosinolate levels. Our results show that two of the loci controlling total aliphatic glucosinolates map to biosynthetic loci that interact epistatically to regulate aliphatic glucosinolate accumulation. In addition to the six loci regulating total indolic glucosinolate concentration, mapping of QTL for the individual indolic glucosinolates identified five additional loci that were specific to subsets of the indolic glucosinolates. These data show that there are a large number of variable loci controlling glucosinolate accumulation in Arabidopsis thaliana.

scholarly journals Changes in cell ultrastructure and morphology of Arabidopsis thaliana roots after coumarins treatment

2014 ◽  
Vol 70 (3) ◽  
pp. 187-198
Author(s):  
Ewa Kupidłowska
Keyword(s):  
Arabidopsis Thaliana ◽  
Cell Wall ◽  
Cell Walls ◽  
Root Elongation ◽  
Inhibitory Effect ◽  
Cell Ultrastructure ◽  
Radial Expansion ◽  
Elongation Zone ◽  
Cortical Cells ◽  
Mother Cell Wall

The ultrastructure and morphology of roots treated with coumarin and umbelliferone as well as the reversibility of the coumarins effects caused by exogenous GA, were studied in <em>Arabidopsis thaliana</em>. Both coumarins suppressed root elongation and appreciably stimulated radial expansion of epidermal and cortical cells in the upper part of the meristem and in the elongation zone. The gibberellic acid applied simultaneously with coumarins decreased their inhibitory effect on root elongation and reduced cells swelling.Microscopic observation showed intensive vacuolization of cells and abnormalities in the structure of the Golgi stacks and the nuclear envelope. The detection of active acid phosphatase in the cytosol of swollen cells indicated increased membrane permeability. Significant abnormalities of newly formed cell walls, e.g. the discontinuity of cellulose layer, uncorrect position of walls and the lack of their bonds with the mother cell wall suggest that coumarins affected the cytoskeleton.

Secondary Metabolites of the Phytopathogen Peronophythora litchii

2010 ◽  
Vol 5 (2) ◽  
pp. 1934578X1000500 ◽  
Author(s):  
Haihui Xie ◽  
Yaoguang Liang ◽  
Jinghua Xue ◽  
Qiaolin Xu ◽  
Yueming Jiang ◽  
...  
Keyword(s):  
Secondary Metabolites ◽  
Spectrometric Data ◽  
Brine Shrimps ◽  
Hydroxybenzyl Alcohol ◽  
New Metabolites

Two new metabolites, 4R*-hydroxy-3,5R*-dimethoxycyclohex-2-enone (1) and 2-hydroxy-N-(2-hydroxyphenyl)propionamide (2), were isolated from solid cultures of the phytopathogen Peronophythora litchii, along with 4-hydroxybenzyl alcohol (3) and methyl D-indole-3-lactate (4). Their structures were elucidated on the basis of spectroscopic and spectrometric data. These metabolites were not toxic to brine shrimps (LC50 > 500 μg/mL).

scholarly journals Secondary metabolites have more influence than morphophysiological traits on litter decomposability across genotypes of Arabidopsis thaliana

2019 ◽  
Vol 224 (4) ◽  
pp. 1532-1543 ◽  
Author(s):  
Elena Kazakou ◽  
François Vasseur ◽  
Kevin Sartori ◽  
Etienne Baron ◽  
Nick Rowe ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Secondary Metabolites

Phytotoxic Secondary Metabolites from the Endolichenic Fungus Myxotrichum sp.

2018 ◽  
Vol 54 (4) ◽  
pp. 638-641 ◽  
Author(s):  
Chao Yuan ◽  
Gang Ding ◽  
Haiying Wang ◽  
Yuhua Guo ◽  
Xiaojun Ma ◽  
...  
Keyword(s):  
Secondary Metabolites ◽  
Endolichenic Fungus

scholarly journals Secondary metabolites from marine microorganisms

2002 ◽  
Vol 74 (1) ◽  
pp. 151-170 ◽  
Author(s):  
ALPHONSE KELECOM
Keyword(s):  
Secondary Metabolites ◽  
Cyclic Peptides ◽  
Marine Invertebrates ◽  
Indole Alkaloids ◽  
Marine Sponges ◽  
Annual Reports ◽  
Marine Microorganisms ◽  
Mature Field ◽  
Bacteria And Fungi ◽  
New Metabolites

After 40 years of intensive research, chemistry of marine natural products has become a mature field. Since 1995, there are signals of decreased interest in the search of new metabolites from traditional sources such as macroalgae and octocorals, and the number of annual reports on marine sponges stabilized. On the contrary, metabolites from microorganisms is a rapidly growing field, due, at least in part, to the suspicion that a number of metabolites obtained from algae and invertebrates may be produced by associated microorganisms. Studies are concerned with bacteria and fungi, isolated from seawater, sediments, algae, fish and mainly from marine invertebrates such as sponges, mollusks, tunicates, coelenterates and crustaceans. Although it is still to early to define tendencies, it may be stated that the metabolites from microorganisms are in most cases quite different from those produced by the invertebrate hosts. Nitrogenated metabolites predominate over acetate derivatives, and terpenes are uncommon. Among the latter, sesquiterpenes, diterpenes and carotenes have been isolated; among nitrogenated metabolites, amides, cyclic peptides and indole alkaloids predominate.

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