Association between Alternaria macrospora and Alternaria alternata, causal agents of cotton leaf blight

1991 ◽  
Vol 69 (12) ◽  
pp. 2603-2607 ◽  
Author(s):  
Yoav Bashan ◽  
Hanna Levanony ◽  
Reuven Or
Keyword(s):  
Gossypium Hirsutum ◽  
Alternaria Alternata ◽  
Leaf Surface ◽  
Gossypium Barbadense ◽  
Cotton Leaf ◽  
Optimal Dosage ◽  
Alternaria Blight ◽  
Cotton Species ◽  
Infested Field ◽  
Blight Disease

The association between Alternaria macrospora and Alternaria alternata, responsible for the development of alternaria blight disease in cotton, was evaluated in artificially inoculated greenhouse plants and in naturally infested field plants. When greenhouse plants were inoculated with suboptimal doses of both pathogens (< 1.2 × 104 spores/mL) infection was greater than when separately inoculated by each pathogen at optimal dosage. In field-grown, naturally infected plants (Gossypium barbadense), both pathogens were found together in more than 40% of the plants. A second field-grown cotton species (Gossypium hirsutum) exhibited infection mainly by either A. alternata or both pathogens together. When both cotton species were naturally infected by both pathogens together, the number of A. alternata spores (either airborne or on the leaf surface) was greater than that of A. macrospora. We propose that A. macrospora together with A. alternata create a disease composite responsible for alternaria blight symptoms in cotton. Key words: Alternaria, cotton diseases, Gossypium barbadense, Gossypium hirsutum.

Symptom expression and ethylene production in leaf blight of cotton caused by Alternaria macrospora and Alternaria alternata alone and in combination

1994 ◽  
Vol 72 (11) ◽  
pp. 1574-1579 ◽  
Author(s):  
Yoav Bashan
Keyword(s):  
Disease Severity ◽  
Ethylene Production ◽  
Alternaria Alternata ◽  
Leaf Blight ◽  
Cotton Leaf ◽  
Symptom Expression ◽  
Leaf Shedding ◽  
Dual Inoculation ◽  
High Concentrations ◽  
Blight Disease

The interaction between the cotton leaf pathogens Alternaria macrospora and Alternaria alternata was studied using dual inoculation at dosages (≈ 103 spores/(mL ∙ pathogen)) that did not produce symptoms with either pathogen alone. This dual inoculation produced the typical disease symptoms (spots and shedding) and disease severity similar to inoculation with 104 spores/mL of A. macrospora alone. Neither pathogen produced ethylene in culture; however, they induced production of ethylene concentrations by diseased tissue that were correlated to both disease severity and leaf shedding. Plants infected by both pathogens produced the highest concentration of ethylene. Leaf discs either from leaves exhibiting symptoms or from symptomless infected leaves produced similarly high concentrations of ethylene. Inoculation of any site of the leaf with A. macrospora alone or with both pathogens resulted in shedding of the leaf. Pretreating inoculated plants with several ethylene inhibitors or an auxin decreased ethylene production, disease severity, and leaf shedding. Alternaria alternata apparently triggers symptom expression by A. macrospora in leaf blight disease of Pima cotton, and disease is manifested by the production of ethylene that leads to the typical leaf shedding symptom. Key words: Alternaria macrospora, Alternaria alternata, cotton leaf blight, defoliation, ethylene, fungus – fungus interaction, leaf spot of cotton, symptomless infections, virulence.

Allohexaploid synthesis and its characteristic identification between cotton species Gossypium hirsutum and G. sturtianum

2019 ◽  
Vol 45 (4) ◽  
pp. 628
Author(s):  
Zhuang-Zhuang SHEN ◽  
Yu-Ying LI ◽  
Er-Hua RONG ◽  
Yu-Xiang WU
Keyword(s):  
Gossypium Hirsutum ◽  
Cotton Species

Gene Flow between Gossypium hirsutum L. and Gossypium barbadense L. is Asymmetric

Crop Science ◽  
2011 ◽  
Vol 51 (1) ◽  
pp. 298-305 ◽  
Author(s):  
Allen E. Van Deynze ◽  
Robert B. Hutmacher ◽  
Kent J. Bradford
Keyword(s):  
Gene Flow ◽  
Gossypium Hirsutum ◽  
Gossypium Barbadense ◽  
Gossypium Hirsutum L

scholarly journals Functional examination of lncRNAs in allotetraploid Gossypium hirsutum

BMC Genomics ◽  
2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Luyao Wang ◽  
Jin Han ◽  
Kening Lu ◽  
Menglin Li ◽  
Mengtao Gao ◽  
...  
Keyword(s):  
Abiotic Stresses ◽  
Expression Patterns ◽  
Leaf Tissue ◽  
Evolutionary Model ◽  
Cotton Leaf ◽  
Functional Screening ◽  
Virus Induced Gene Silencing ◽  
Individual Gene ◽  
Cotton Species ◽  
Allotetraploid Cotton

Abstract Background An evolutionary model using diploid and allotetraploid cotton species identified 80 % of non-coding transcripts in allotetraploid cotton as being uniquely activated in comparison with its diploid ancestors. The function of the lncRNAs activated in allotetraploid cotton remain largely unknown. Results We employed transcriptome analysis to examine the relationship between the lncRNAs and mRNAs of protein coding genes (PCGs) in cotton leaf tissue under abiotic stresses. LncRNA expression was preferentially associated with that of the flanking PCGs. Selected highly-expressed lncRNA candidates (n = 111) were subjected to a functional screening pilot test in which virus-induced gene silencing was integrated with abiotic stress treatment. From this low-throughput screen, we obtained candidate lncRNAs relating to plant height and tolerance to drought and other abiotic stresses. Conclusions Low-throughput screen is an effective method to find functional lncRNA for further study. LncRNAs were more active in abiotic stresses than PCG expression, especially temperature stress. LncRNA XLOC107738 may take a cis-regulatory role in response to environmental stimuli. The degree to which lncRNAs are constitutively expressed may impact expression patterns and functions on the individual gene level rather than in genome-wide aggregate.

scholarly journals The Gossypium stocksii genome as a novel resource for cotton improvement

2021 ◽  
Author(s):  
Corrinne E Grover ◽  
Daojun Yuan ◽  
Mark A Arick ◽  
Emma R Miller ◽  
Guanjing Hu ◽  
...  
Keyword(s):  
Genome Sequence ◽  
De Novo ◽  
Pest Resistance ◽  
Cotton Leaf ◽  
High Quality ◽  
Cotton Leaf Curl Virus ◽  
Cotton Species ◽  
Wild Cotton ◽  
Leaf Curl Virus ◽  
Insight Into

Abstract Cotton is an important textile crop whose gains in production over the last century have been challenged by various diseases. Because many modern cultivars are susceptible to several pests and pathogens, breeding efforts have included attempts to introgress wild, naturally resistant germplasm into elite lines. Gossypium stocksii is a wild cotton species native to Africa, which is part of a clade of vastly understudied species. Most of what is known about this species comes from pest resistance surveys and/or breeding efforts, which suggests that G. stocksii could be a valuable reservoir of natural pest resistance. Here we present a high-quality de novo genome sequence for G. stocksii. We compare the G. stocksii genome with resequencing data from a closely related, understudied species (G. somalense) to generate insight into the relatedness of these cotton species. Finally, we discuss the utility of the G. stocksii genome for understanding pest resistance in cotton, particularly resistance to cotton leaf curl virus.

Sign in / Sign up

Export Citation Format

Share Document