Studies on cotton stenosis—I. Auxin metabolism of the diseased plant

1972 ◽  
Vol 76 (2) ◽  
pp. 79-84
Author(s):  
P. Narayanasamy ◽  
T. Jaganathan ◽  
K. Ranganathan ◽  
A. Palaniswami
Keyword(s):  
Diseased Plant ◽  
Auxin Metabolism

Auxin metabolism and transport during gravitropism

1991 ◽  
Vol 82 (3) ◽  
pp. 477-482 ◽  
Author(s):  
Karen E. Parker
Keyword(s):  
Auxin Metabolism

scholarly journals Population genetic variation analysis of bitter gourd wilt caused by Fusarium oxysporum f. sp. momordicae in China using inter simple sequence repeats (ISSR) molecular markers

2021 ◽  
Author(s):  
Rui Zang ◽  
Ying Zhao ◽  
Kangdi Guo ◽  
Kunqi Hong ◽  
Huijun Xi ◽  
...  
Keyword(s):  
Genetic Variation ◽  
Genetic Differentiation ◽  
Fusarium Oxysporum ◽  
Diversity Index ◽  
Gene Diversity ◽  
Pcr Amplification ◽  
Bitter Gourd ◽  
Diseased Plant ◽  
Variation Analysis ◽  
Group I

AbstractBitter gourd wilt caused by Fusarium oxysporum f. sp. momordicae (FOM) is a devastating crop disease in China. A total of 173 isolates characteristic of typical Fusarium oxysporum with abundant microconidia and macroconidia on white or ruby colonies were obtained from diseased plant tissues. BLASTn analysis of the rDNA-ITS of the isolates showed 99% identity with F. oxysporum species. Among the tested isolates, three were infectious toward tower gourd and five were pathogenic to bottle gourd. However, all of the isolates were pathogenic to bitter gourd. For genetic differences analysis, 40 ISSR primers were screened and 11 primers were used for ISSR-PCR amplification. In total, 127 loci were detected, of which 76 were polymorphic at a rate of 59.84%. POPGENE analysis showed that Nei’s gene diversity index (H) and Shannon’s information index (I) were 0.09 and 0.15, respectively, which indicated that the genetic diversity of the 173 isolates was low. The coefficient of gene differentiation (Gst = 0.33 > 0.15) indicated that genetic differentiation was mainly among populations. The strength of gene flow (Nm = 1.01 > 1.0) was weak, indicating that the population differentiation caused by gene drift was blocked to some degree. The dendrogram based on ISSR markers showed that the nine geographical populations were clustered into two groups at the threshold of genetic similarity coefficient of 0.96. The Shandong and Henan populations were clustered into Group I, while the Guangdong, Hainan, Guangxi, Fujian, Jiangxi, and Hubei populations constituted Group II. Results of the genetic variation analysis showed that the Hunan and Guangxi populations had the highest degree of genetic differentiation, while the Hubei population had the lowest genetic differentiation. Our findings enrich the knowledge of the genetic variation characteristics of FOM populations with the goal of developing effective disease-management programs and resistance breeding programs.

The influence of epiphytic bacteriae on auxin metabolism

Planta ◽  
1966 ◽  
Vol 68 (4) ◽  
pp. 327-334 ◽  
Author(s):  
E. Libbert ◽  
S. Wichner ◽  
U. Schiewer ◽  
H. Risch ◽  
W. Kaiser
Keyword(s):  
Auxin Metabolism

scholarly journals Morphological and Molecular Diversity of Ginger (Zingiber officinale Roscoe) Pathogenic Fungi in Chilga District, North Gondar, Ethiopia

2022 ◽  
Vol 2 ◽  
Author(s):  
Sefinew Tilahun ◽  
Marye Alemu ◽  
Mesfin Tsegaw ◽  
Nega Berhane
Keyword(s):  
Causative Agent ◽  
Fungal Pathogens ◽  
Pathogenic Fungus ◽  
Management Strategies ◽  
Infected Plant ◽  
Pathogenic Fungi ◽  
Zingiber Officinale ◽  
Morphological Characterization ◽  
Molecular Techniques ◽  
Diseased Plant

Ginger diseases caused by fungal pathogens have become one of the most serious problems causing reduced production around the world. It has also caused a major problem among farmers in different parts of Ethiopia resulting in a huge decline in rhizome yield. However, the exact causative agents of this disease have not been identified in the state. Although there are few studies related to pathogenic fungus identification, molecular level identification of fungal pathogen was not done in the area. Therefore, this study was undertaken to isolate and characterized the fungal causative agent of ginger disease from the diseased plant and the soil samples collected around the diseased plant from Chilga district, Gondar, Ethiopia. Samples from infected ginger plants and the soil around the infected plant were collected. Culturing and purification of isolates were made using Potato Dextrose Agar supplemented with antibacterial agent chloramphenicol. The morphological characterization was done by structural identification of the isolates under the microscope using lactophenol cotton blue stains. Isolated fungi were cultured and molecular identification was done using an internal transcribed spacer (ITS) of ribosomal DNA (rDNA). A total of 15 fungal morphotypes including 11 Aspergillus spp. (73.3%), 2 Penicillium spp. (13.3%), and single uncultured fungus clone S23 were isolated from the samples representing all the plant organs and the soil. Aspergillus spp. (73.3%) was the most common and seems to be the major causative agent. To the best of our knowledge, this is the first report of ginger pathogenic fungi in Ethiopia identified using ITS rDNA molecular techniques. This study will lay foundation for the development of management strategies for fungal diseases infecting ginger.

scholarly journals ELECTRON MICROSCOPIC EVIDENCE FOR PURIFICATION OF COCONUT ROOT (WILT) DISEASE PHYTOPLASMA

CORD ◽  
2002 ◽  
Vol 18 (01) ◽  
pp. 34
Author(s):  
M. Mayilvaganan ◽  
J. J. Solomon
Keyword(s):  
Plant Material ◽  
Gradient Centrifugation ◽  
Spherical Shape ◽  
Electron Microscopic Examination ◽  
Wilt Disease ◽  
Diseased Plant ◽  
Percoll Gradient ◽  
Electron Microscopic ◽  
Centrifugation Method ◽  
Discontinuous Percoll Gradient

Root (wilt) disease phytoplasma was purified from diseased coconut tissues using discontinuous Percoll gradient centrifugation method. Crude sap prepared from coconut was layered on a discontinuous Percoll gradient of 15, 30, 50 and 60%(v/v). After centrifugation at 20,000 g for 30 min, the turbid fraction formed on the top of 30% gradient in the diseased plant material was recovered, processed and fixed for electron microscopy. Electron microscopic examination of sections prepared from purified preparation of diseased plant material showed typical cells of root (wilt) phytoplasma with heterogeneous sizes and more or less spherical shape that are similar to those found in sieve elements of diseased tissues and salivary glands of infective (viruliforms) insect vectors. These purified phytoplasma bodies showed trilaminar membrane with internal materials of ribosome granules and DNA fibrils. However, the yield in terms of number of cells was fewer and in addition to intact bodies, free membranes and empty bodies lacking internal contents also were observed.

Auxin metabolism and transport during gravitropism

1991 ◽  
Vol 82 (3) ◽  
pp. 477-482 ◽  
Author(s):  
Karen E. Parker
Keyword(s):  
Auxin Metabolism

scholarly journals Local auxin metabolism regulates environment-induced hypocotyl elongation

Nature Plants ◽  
2016 ◽  
Vol 2 (4) ◽  
Author(s):  
Zuyu Zheng ◽  
Yongxia Guo ◽  
Ondřej Novák ◽  
William Chen ◽  
Karin Ljung ◽  
...  
Keyword(s):  
Hypocotyl Elongation ◽  
Auxin Metabolism

Ectopic expression of the Coffea canephora SERK1 homolog-induced differential transcription of genes involved in auxin metabolism and in the developmental control of embryogenesis

2018 ◽  
Vol 163 (4) ◽  
pp. 530-551 ◽  
Author(s):  
Daniel Pérez-Pascual ◽  
Doribet Jiménez-Guillen ◽  
Hernán Villanueva-Alonzo ◽  
Ramón Souza-Perera ◽  
Gregorio Godoy-Hernández ◽  
...  
Keyword(s):  
Ectopic Expression ◽  
Coffea Canephora ◽  
Developmental Control ◽  
Auxin Metabolism ◽  
Differential Transcription
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