Occurrence of Malformin‐like Substances in Seedlings of Mango (<i>Mangifera indica</i> L.)*

Singh, Zora; Dhillon, Balwinder Singh

doi:10.1111/j.1439-0434.1987.tb04438.x

Journal of Phytopathology

1987

DOI: 10.1111/j.1439-0434.1987.tb04438.x

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Occurrence of Malformin‐like Substances in Seedlings of Mango (Mangifera indica L.)*

Zora Singh

Balwinder Singh Dhillon

Abstract: The ether soluble extracts from stem and root tissues of malformed seedlings of mango showed four malformin‐like substances on chromatograms in the corn root curvature test at Rf 0–0.1 (M1), 0.1–0.2 (M2), 0.8–0.9 (M9) and 0.9–1.0 (M10). M10 was identified as a malformin A‐like substance(s). Stems and roots of malformed seedlings contained high levels of malformin A‐like substance(s) (42.0 μg/g and 41.0 μg/g) respectively, which were absent in stems and roots of healthy seedlings.

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Cited by 7 publications

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“…The disease affects vegetative shoots and floral panicles resulting in phyllody and hypertrophy (Singh and Dhillon 1990a;Ploetz 1994). Various aetiologies, including viral (Das et al 1989), nutritional (Prashad et al 1965;Singh et al 1991) and hormonal (Singh and Dhillon 1987, 1988, 1990b, have previously been claimed in the literature. A novel experiment by Freeman et al (1999) unequivocally proved the causal relationship between Fusarium subglutinans (Wollenweb.…”

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Cytology of infection of Fusarium mangiferae Britz in different malformed reproductive parts of mango

et al. 2010

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Aetiology of mango malformation (MM) has intrigued the scientists since its inception. The objective of the study was to glean an insight into association of the fungus, Fusarium mangiferae, with different malformed regions, viz. panicle-shoot juncture, apical buds, primary and secondary peduncles, in five exotic mango cultivars. Tissue assays revealed an infection of 88.5, 84.75 and 82.5% in cvs Zill, Sensation and Tommy Atkins, respectively. Least infection of 69.75% was found in cv. Keitt. No exotic cultivar was found to be free of fungal infection. Apical buds proved to be the potential infection site of the fungus amongst the four malformed regions, hosting maximum withintissue infection of 86.2%. Determination of F. mangiferae at proximal and distant sites of the malformed panicles exhibited maximum recovery of 82.0% at 0 cm and only 3% at >30 cm distance beneath the panicle. In the case of non-malformed panicles, an infection of 14.0% was recorded at 0 cm distance while no detection could be made from non-malformed branches. Moreover, examination of ultra-thin bud sections under Transmission Electron Microscopy (TEM) revealed inter-and intra-cellular ramification of fungal hyphae, indicating fungal ingress in malformed bud tissues of local cv. Malda. The present studies explored the sites hosting the causal fungus in mango and provide convincing evidence that F. mangiferae is responsible for turning healthy tissues into the malformed condition. These findings suggest that inoculum specific management strategies are needed in future to curb malformation disease in mango orchards.

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confidence: 96%

Cytology of infection of Fusarium mangiferae Britz in different malformed reproductive parts of mango

et al. 2010

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Nutrient levels in malformed and healthy tissues of mango (Mangifera indica L.)

1991

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Samples of malformed and healthy panicles of mango (Mangifera indica L.) as well as leaves and shoots bearing them were collected at different stages of development (fully swollen buds, bud inception, fully grown panicles prior to full bloom and at full bloom) over two consecutive years and were analysed for their macro-and micronutrient status. In addition, malformed and healthy seedlings were collected and analysed. Malformed panicles were found to be significantly higher in N at all the developmental stages except at bud inception. Phosphorus and K also tended to accumulate in malformed panicles at later stages of their development. In general, malformed panicles exhibited lower levels of P, K and Ca than healthy panicles. The differences in levels of Mg and S in malformed and healthy panicles were not significant. All micronutrients were in much lower concentrations in malformed panicles except for Mn which appears to accumulate in malformed panicles particularly at the early stages of development. The leaves on the shoots bearing malformed panicles also showed a tendency to accumulate N, while P, Mg and S were always higher in leaves on shoots bearing healthy panicles. The leaves on shoots bearing healthy panicles had lower levels of Fe, Cu and Mn, whereas levels of Zn and B tended to be higher in leaves on shoots bearing malformed panicles. The nutrient concentration differences between the two kinds of shoots were generally nonsignificant (P = 0.05), except for K and S which were significantly lower in shoots bearing malformed panicles. The shoots bearing malformed panicles showed significantly (P = 0.05) higher levels of almost all nutrients compared with shoots bearing healthy panicles. Vegetative malformation was found to be associated significantly (p = 0.05) with higher amounts of all nutrients except Ca which was significantly higher in healthy seedlings. The present study, therefore, seems to point to lower Ca as one of the pre-disposing factors causing malformation in mango.

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Floral malformation, yield and fruit quality ofMangifera indicaL. in relation to ethylene

Singh

Dhillon

1990

Journal of Horticultural Science

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Occurrence of Malformin‐like Substances in Seedlings of Mango (Mangifera indica L.)*

Cited by 7 publications

References 9 publications

Cytology of infection of Fusarium mangiferae Britz in different malformed reproductive parts of mango

Cytology of infection of Fusarium mangiferae Britz in different malformed reproductive parts of mango

Nutrient levels in malformed and healthy tissues of mango (Mangifera indica L.)

Floral malformation, yield and fruit quality ofMangifera indicaL. in relation to ethylene

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