Pathogenicity of novel <i>Monosporascus</i> species in accessions of melon varietal groups

Costa, Francisco Cleilson Lopes; Negreiros, Andréia Mitsa Paiva; Sales Júnior, Rui; Nunes, Glauber Henrique de Sousa

doi:10.1590/S1678-3921.pab2024.v59.03383

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Phytopathology/ Original Article • Pesq. agropec. bras. 59 • 2024 • https://doi.org/10.1590/S1678-3921.pab2024.v59.03383 linkcopy

Pathogenicity of novel Monosporascus species in accessions of melon varietal groups

Patogenicidade de novas espécies de Monosporascus em acessos de grupos varietais de melão

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

The objective of this work was to evaluate the pathogenicity of the following Monosporascus species: Monosporascus brasiliensis, Monosporascus caatinguensis, Monosporascus mossoroensis, Monosporascus nordestinus, and Monosporascus semiaridus in comparison with Monosporascus cannonballus, as well as the reaction to these pathogens of the A-16, C-32, 'Goldex', and 'Hales Best Jumbo' melon accessions, which belong to the acidulus, cantalupensis, conomon, and inodorus varietal groups, respectively. Vine decline severity was evaluated based on root damage and on the root dry matter reduction index. All studied Monosporascus species caused damage to the melon accessions, but only M. brasiliensis, M. nordestinus, and especialy M. caatinguensis were considered virulent. The A-16 accession shows higher resistance to M. nordestinus, M. caatinguensis, and M. cannonballus, whereas 'Goldex' presents susceptibility to M. caatinguensis, M. nordestinus, and M. semiaridus. The M. brasiliensis, M. caatinguensis, M. mossoroensis, M. nordestinus, and M. semiaridus species present varying levels of pathogenicity and diferent levels of infection severity, with M. semiaridus having the highest severity, and M. cannonballus, the lowest.

Index terms: Cucumis melo ; germplasm; vine decline; virulence

Species	Accession⁽²⁾				Average
	A-16	C-32	'Goldex'	'HBJ'
Monosporascus brasiliensis	80.5Aa	38.3Ba	53.8Ba	84.8Aa	64.4
Monosporascus cannonballus	29.5Ab	55.9Aa	65.0Aa	47.1Ab	49.4
Monosporascus caatinguensis	14.5Bb	78.1Aa	78.1Aa	59.8Ab	57.7
Monosporascus mossoroensis	50.9Aa	71.4Aa	64.7Aa	48.8Ab	61.2
Monosporascus nordestinus	14.5Bb	62.6Aa	80.2Aa	96.0Aa	63.3
Monosporascus semiaridus	71.4Aa	55.9Aa	78.1Aa	70.0Ab	68.9
Average	45.1	60.4	69.9	67.9
Effect⁽³⁾	df₁	df₂	Test (Type III - Wald)
			F		χ² (2) 'HBJ', 'Hales Best Jumbo'.
Accessions (A)	3	96	4.84^ Significant at 5 and 1% probability by the F-test and Chi-square (χ2) test, respectively;		14.53^ Significant at 5 and 1% probability by the F-test and Chi-square (χ2) test, respectively;
Species (S)	5	96	1.08^ns ns Nonsignificant.		5.42^ns ns Nonsignificant.
A × S	15	96	3.01^ Significant at 5 and 1% probability by the F-test and Chi-square (χ2) test, respectively;		45.07^ Significant at 5 and 1% probability by the F-test and Chi-square (χ2) test, respectively;

Species	Accession⁽¹⁾
	A-16	C-32	'Goldex'	'HBJ'
Monosporascus brasiliensis	SU	MR	MR	SU
Monosporascus cannonballus	HR	MR	MR	MR
Monosporascus caatinguensis	HR	SU	SU	MR
Monosporascus mossoroensis	MR	MR	MR	MR
Monosporascus nordestinus	HR	MR	SU	SU
Monosporascus semiaridus	MR	MR	SU	MR

Species		Accession⁽²⁾
		A-16		C-32		'Goldex'	'HBJ'
		Root reduction index
Monosporascus brasiliensis		0.53Aa		0.38Ba		0.45Ba	0.26Bb
Monosporascus cannonballus		0.30Bb		0.24Ba		0.58Aa	0.10Bb
Monosporascus caatinguensis		0.17Ab		0.17Ba		0.32Ab	0.27Ab
Monosporascus mossoroensis		0.24Bb		0.46Aa		0.40Aa	0.36Ab
Monosporascus nordestinus		0.26Bb		0.21Ba		0.46Aa	0.59Aa
Monosporascus semiaridus		0.39Ab		0.29Aa		0.25Ab	0.23Ab
Effect	df₁		df₂		Test (F of Snedecor)
Acession (A)	3		96		2.01^ns ns Nonsignificant.
Species (S)	5		96		2.25^ns ns Nonsignificant.
A x S	15		96		1.91^* * and

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Embrapa Secretaria de Pesquisa e Desenvolvimento; Pesquisa Agropecuária Brasileira Caixa Postal 040315, 70770-901 Brasília DF Brazil, Tel. +55 61 3448-1813, Fax +55 61 3340-5483 - Brasília - DF - Brazil
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[TFN1] ⁽¹⁾
Means followed by equal letters, uppercase in the rows and lowercase in the columns, do not differ from each other by Scott-Knott’s test, at 5% probability.

[TFN2] ⁽²⁾
'HBJ', 'Hales Best Jumbo'.

[TFN3] ⁽³⁾
df1, degrees of freedom of the numerator; and df2, degrees of freedom of the denominator.

[TFN4] ^*
and

[TFN5] ^**
Significant at 5 and 1% probability by the F-test and Chi-square (χ² (2) 'HBJ', 'Hales Best Jumbo'. ) test, respectively;

[TFN6] ^ns
Nonsignificant.