Invading time of Colletotrichum gloeosporioides affects fruit drop and infection rate in ‘Irwin’ mango (Mangifera indica L.)

2012 ◽  
Vol 53 (6) ◽  
pp. 452-459
Author(s):  
Chin-Hsing Chang ◽  
Tzong-Shyan Lin ◽  
Wen-Ju Yang
Author(s):  
Ben Hadj-Daoud H ◽  
◽  
Ben Salem I ◽  
Boughalleb-M’Hamdi N ◽  
◽  
...  

Background: Colletotrichum gloeosporioides is important plant pathogens on a wide range of plant hosts such as citrus causing pre- or post-harvest infections as anthracnose, post-bloom fruit drop, tearstain and stem-end rot on fruit, or wither-tip of twigs. Method: The optimization of growth conditions of this pathogen was performed (solid media, temperature, pH and water potential under laboratory experiments). Results: Our results revealed that the maximum radial growth of C. gloeosporioides was recorded on SDA medium. All isolates were able to grow on PDA at temperatures of 15 and 30°C (over 0.7cm/day). Optimal growth radial was recorded at pH 5, 6, 7 and 8. Similar responses were obtained with both salt types, but, in general, C. gloeosporioides was more tolerant to KCl than NaCl. Conclusion: Studies of cultural, morphological traits of the pathogen are prominent to understand the response of the pathogen in different environmental and nutritional conditions.


2012 ◽  
Vol 11 (1) ◽  
pp. 18-24 ◽  
Author(s):  
A. Pandey ◽  
B.K. Pandey ◽  
M. Muthukumar ◽  
L.P. Yadava ◽  
U.K. Chauhan

2011 ◽  
Vol 159 (10) ◽  
pp. 657-664 ◽  
Author(s):  
L. Chathurika Karunanayake ◽  
Nimal Adikaram ◽  
B. M. Mallika Kumarihamy ◽  
B. M. Ratnayake Bandara ◽  
Charmalie Abayasekara

1983 ◽  
Vol 10 (1) ◽  
pp. 65 ◽  
Author(s):  
S Ram ◽  
SC Sirohi ◽  
VS Rathore

The fruit of mango (Mangifera indica L.) contained cytokinins in both pericarp and seed. During the single period of rapid growth in fruit and seed (7-42 days after pollination), cytokinin concentration increased rapidly at two times. The first preceded the period of rapid cell division and cell enlargement and the second coincided with the period of rapid cell enlargement only. Deficiency of cytokinin in the fruit appears to favour fruit drop and cessation of fruit growth. Eleven cytokinin fractions were isolated by ion-exchange column and paper chromatography from immature mango fruits. These fractions were termed Mf1 to Mf11, on the basis of their RF values and spectral properties. Two of these, Mf9 and Mf10, could be tentatively identified as zeatin riboside and zeatin, respectively.


2019 ◽  
Vol 14 (1) ◽  
pp. 33-42
Author(s):  
K S Shivashankara ◽  
G A Geetha ◽  
T K Roy

Mango productivity is affected mainly by irregular flowering, proportion of bisexual flowers, poor pollination and fertilization and fruit drop. Poor fruit set in some of the varieties may be associated with the lower pollen viability. The present experiment was initiated to assess the viability of pollen grains and their metabolites in three mango cultivars Amrapali, Alphonso and Totapuri which are differing in their fruit set intensity. The profiling of sugars, amino acids and some of the phytohormones were analysed using Liquid Chromatography-Mass Spectrometry (LC-MS/MS). Assessment of pollen grains in three mango cultivars indicated that free sugars such as fructose and glucose, and available amino acids including serine, proline, lysine, phenylalanine, alanine and glutamic acid were predominantly higher in all the cultivars. Phytohormones like IAA, IBA, ABA, GA,zeatin, jasmonic acid and salicylic acid were significantly different in low fruit setting cultivars Alphonso and Totapuri compared to high fruit setting cultivar Amrapali. In cv. Alphonso all the metabolites were higher at anthesis but later decreased drastically compared to cvs. Totapuri and Amrapali. Pollen viability percentage was significantly higher in cv. Amrapali than in cvs. Totapuri, Alphonso. Among all the cultivars, Amrapali maintained better chemical composition at anthesis and also at two hours after anthesis compared to cvs. Totapuri and Alphonso.


2021 ◽  
Vol 17 (29) ◽  
pp. 128
Author(s):  
Christelle Flavie Mbieji Kemayou ◽  
Grâce Annih Mbong ◽  
Marie Caroline Momo Solefack ◽  
Jean Kuate

La présente étude s’inscrit dans le cadre de la valorisation des mangues locales et de la perception endogène des pratiques culturales associées. Cette étude a été menée entre mars et juin 2020, dans les Départements du Noun et de la Lékié, dans onze (11) villages à fort potentiel de manguiers. L’enquête s’est faite par administration des questionnaires et par des observations directes auprès de 300 producteurs de mangues locales. Il en ressort que les producteurs sont en majorité des hommes (82,66%) mariés, de plus de 50 ans (59,3%), de niveau primaire (60%) pour le Noun et secondaire (59,3%) pour la Lékié. Les surfaces exploitées sont de moins de 1000 m2, localisées au bord de leurs concessions. Dans les deux Départements, l’itinéraire technique telle que recommandée par les experts n’est pas respecté et les techniques de récolte pratiquées sont inappropriées. Elles se font soit par la grimpe, la secousse de l’arbre ou l’utilisation des crochets. Les fruits récoltés sont mal conditionnés et vendus dans les différents contenants. L’anthracnose (Colletotrichum gloeosporiodes) et la chute de fruits immatures sévissent dans les vergers. Huit variétés locales ont été identifiées. Pour une bonne production des mangues locales dans le Noun et la Lékié il est important pour les producteurs d’améliorer leur capacité, d’utiliser les variétés locales greffées et de se former en techniques de conservation des mangues.  This study is part of the valorisation of local mangoes and the endogenous perception of associated cultivation practices. This study was carried out between March and June 2020, in the Noun and Lékié Divisions, in eleven (11) villages with high potential for mango trees. The survey was carried out by administering questionnaires and by direct observations with 300 local mango producers. It appears that the majority of producers are married men (82.66%), over 50 (59.3%), primary (60%) for the Noun and secondary (59.3%) for the Lékié. The areas exploited are less than 1000 m2, located at the edge of their concessions. In both Divisions, the technical itinerary as recommended by the experts is not followed and the harvesting techniques practiced are inappropriate. They are done either by climbing, shaking the tree or using the hooks. The harvested fruits are poorly packaged and sold in the various containers. Anthracnose (Colletotrichum gloeosporiodes) and immature fruit drop are rampant in orchards. Eight local varieties have been identified. For a good production of local mangoes in Noun and Lékié it is important for producers to improve their capacity, to use grafted local varieties and to be trained in mango conservation techniques.


Author(s):  
Marcia Barquero Quirós ◽  
Natalia A. Peres ◽  
Luis Felipe Arauz

La antracnosis es una enfermedad causada por varias especies del género Colletotrichum en diferentes hospederos. C. acutatum y C. gloeosporioides son especies morfológicamente similares, que pueden causar síntomas similares en el mismo hospedero. Se colectaron 220 aislamientos de Colletotrichum de muestras con síntomas típicos de antracnosis en helecho hoja de cuero (Rumohra adiantiformis), limón criollo (Citrus aurantifolia), carambola (Averrhoa carambola), papaya (Carica papaya) y mango (Mangifera indica) en Costa Rica y Florida, Estados Unidos. Los aislamientos se caracterizaron por morfología de colonia, sensibilidad al benomil, y PCR con los iniciadores específicos para C. acutatum y C. gloeosporioides CaInt2 y Cg/fInt1, respectivamente; también se analizó la morfología de las colonias de ambas especies. De los 85 aislamientos obtenidos de mango, todos los aislamientos de Florida fueron identificados como C. acutatum, mientras que todos los aislamientos de Costa Rica fueron C. gloeosporioides. De los 60 aislamientos de carambola, 3 provenientes de Costa Rica fueron C. acutatum (primer informe) y el resto fueron C. gloeosporioides. Todos los aislamientos de helecho hoja de cuero (25 aislamientos) y de limón criollo (25 aislamientos) se identificaron como C. acutatum. Los demás aislamientos de carambola y mango así como todos los aislamientos de papaya, se identificaron como C. gloeosporioides. No se encontró diferenciación de síntomas entre ambas especies sobre los hospederos donde se encontraron.


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