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Reaction of common bean progenies to white mold derived from recurrent selection/Reacao de progenies de feijao ao mofo branco derivadas de selecao recorrente.


In general, the occurrence of diseases contributes to low yield, instability in the production and a high risk of implantation of bean crop. Among the diseases that have limited the obtaining of high yield in common bean crop, white mold (Sclerotinia sclerotiorum) and angular leaf spot (Pseudocercospora griseola) stand out.

For angular leaf spot, the resistance has been attributed to one, two, three or more independent genes, in some cases dominant, in others recessive, some of them with allelic forms, and can be found in several cultivars. However, almost all cultivars used in the country are, to a greater or lesser degree, susceptible to angular leaf spot (CAIXETA et al., 2005), also suggesting the existence of horizontal resistance. In such situations, one of the alternatives to accumulate the several resistance alleles is the recurrent selection, a cyclical and dynamic system, which aims to increase gradually the frequency of favorable alleles for a quantitative characteristic, through repeated cycles of selection, evaluation and recombination (RAMALHO et al., 2005). In the case of self-pollinated plants, there are plenty of results that prove their efficiency (WIERSMA et al., 2001; RAMALHO et al., 2005; AMARO et al., 2007; ARANTES et al., 2010).

In relation to the white mold, it is known that there is more damage, especially in winter and in cultivations under irrigation. The white mold affects severely the plant, and the cultivars in use in Brazil do not have adequate resistance level (GONCALVES & SANTOS, 2010). A procedure used for identifying resistance sources to this disease is an indirect method, through the reaction to oxalic acid. Tests conducted in greenhouses and in the field showed the most tolerant genotypes to oxalic acid are also the most resistant ones to white mold. The reason for this fact is due to the oxalic acid is the primary factor of pathogenicity of the fungus (KOLKMAN & KELLY, 2000).

Aggregating in an only plant, resistance to angular leaf spot and to white mold, would be a fact of extreme importance for obtaining a new cultivar, and also for increasing the grain yield. Thus, if resistant progenies to both diseases were found, they would be more promising as new cultivars.

Thus, the aim of this research was to verify the resistance of common bean progenies to white mold, evaluated through the reaction to oxalic acid.


The plant material used was the parents and selected progenies through a program of recurrent selection for resistance to angular leaf spot and carioca grain type. The base population was obtained intercrossing in the partial diallel scheme, seven lines with carioca grain type (Carioca MG, CI-140, CI-128, ANPAT 8.12, IAPAR 81, ESAL 693 and Perola) and ten resistance sources to angular leaf spot (P griseola) (AN 512561, AND 277, Ouro Negro, Compuesto Negro Chimaltenango, CAL 143, MAR 2, MAR 1, G 5686, MA 4.137 and Jalo), including various grains types. All the procedure used for obtaining the 35 progenies (five progenies selected in seven cycles of recurrent selection) is described in ARANTES et al. (2010).

Besides the parents and progenies, a susceptible check (IPR-Corujinha) and a resistant check ('G-122') to white mold were used. The cultivar 'Corujinha' belongs to the commercial carioca group and it was named this way due to the peculiar appearance of its grains: a lite brown mottle on a lite cream background. It has upright plant, favoring the mechanical harvesting. This cultivar is highly susceptibility to white mold. The cultivar 'G-122' has determined growth habit (type I), Andean origin, big seeds, red mottle on a cream background. This cultivar has showed field resistance to white mold (SINGH, 1982; STEADMAN et al., 1998), which probably, results from physiological resistance (MIKLAS et al., 2001).

Sixty seeds of each one of the 54 genotypes were sown (35 progenies from the recurrent selection, 17 parents, and susceptible and resistant checks), in polystyrene trays containing commercial substrate Plantmax[R]. It was sown a seed per cell of the tray. After the emergence of the second trifoliate leaf, around 20 days after the sowing, the 30 most uniform plants were selected.

Due to the limitation of space in the laboratory, five experiments were carried out, using susceptible cultivar 'Corujinha' as common check in each experiment. In four of these experiments, 12 genotypes were evaluated each time, and in the fifth one, the other 10 genotypes were evaluated (which totalize 58 treatments referring to 54 genotypes plus the common check 'Corujinha' in the other four experiments). Each experiment was set up using the completed randomized design with three repetitions, being each plot represented by 10 plants.

Plants of 20 to 21 days old with trifoliate leaves emitted were used. They were cut on stem base in the afternoon, and the inferior part of the stem (2cm) was immersed in solution of oxalic acid 20mM, kept in a plastic container from 15 to 20 hours during the night in protected environment. The solution had pH adjusted to 4 with sodium hydroxide (NaOH). The control (treatment without oxalic acid) consisted in container with distilled water (pH 4), in which the check was placed immersed.

The reaction of each plant was determined through the scores proposed by KOLKMAN & KELLY (2000): 1. Absence of wilt leaves; 2. A trifoliate leaf or both wilt unifoliate; 3. Two wilt leaves; 4. More than two wilt leaves; 5. Wilt leaves and petioles and 6. Plant completely wilt. A score was given by plant. The wilt symptoms cover from the roll of the tip of the leaf until the total turgidity loss of the whole leaf.

Initially, the mean was obtained by plot. The data of mean score per plot were submitted to the variance analysis. The group analysis of the five experiments was carried out through PROC GLM procedure of SAS software (STATISTICAL ANALYSIS SYSTEM INSTITUTE--SAS INSTITUTE, 2000). Afterwards, the adjusted means of the different genotypes were grouped by the test of SCOTT & KNOTT (1974), at 5% of probability. The heritabilities and the confidence intervals were estimated according to the expression of KNAPP et al. (1985). The studies of heritability have been used in populations whose individuals constitute a random sample. When applied to a set of pre-selected genetic materials, it is common to use the expression genotypic determination coefficient, which is similar to heritability, and expresses the amount of phenotypic variation observed, which is due to genetic causes, such as in the particular progenies group evaluated. This estimate will be referred to as heritability ([h.sup.2]). Moreover, for each experiment, statistics experimental coefficient of variation (CVe) and selective accuracy ([]) were estimated (RESENDE & DUARTE, 2007).


Significant genotypic differences (P < 0,01) were found among the genotypes evaluated, as were observed by some authors that used the same methodology for common bean (GONCALVES & SANTOS, 2010) (Table 1). The difference among the progenies shows the existence of genetic variability, which is promising for identifying those with resistance to both diseases. It was not observed wilt symptoms in control plants like in KOLKMAN & KELLY (2000). This fact indicates that the wilt of the plants was due to the oxalic acid. The experiment was carried out with high experimental accuracy, as it can be seen by CV (12,43%) and [] (95,38%).

The main function of heritability is its predictive role, which expresses the reliability of the phenotypic value as estimator of the genotypic value, in such a way that the higher the heritability, the more genetic gain per selection (RAMALHO et al., 1993). Thus, the progenies and parents evaluated in this experiment show a wide variability of reaction to oxalic acid ([h.sup.2] =90,98%), being an indicator of having a big chance of success if the selection is realized.

Among the parents used (Table 2), six of them were grouped in the first group with mean inferior to 1,53 (Group A). Of these, AND 277 presented the lowest mean (0,83). This is an Andean cultivar having resistance alleles to anthracnose and to the angular leaf spot (ALZATE-MARIN et al., 2003; CAIXETA et al., 2005).This cultivar still has great chances of also having resistance alleles to white mold according to the mean score obtained, of light wilt symptom that characterizes disease resistance.

The significant difference (P < 0,01) among the parents shows that some of them have resistance alleles to white mold (Table 1). Thus, there is a possibility of associating these alleles with the higher levels of resistance of angular leaf spot, grain yield, and the carioca grain type of the selected progenies derived from the recurrent selection.

The progenies were separated in seven different groups according to the data of table 3. The progenies that showed higher resistance to wilt, being characterized as the most resistant ones were: MAV1.7 and MAV-3.36, which belong to the fifth cycle of selection and the progenies MAVI-21 and MAVI-60, to the sixth cycle. It must be mentioned that even in initial cycles, some progenies showed average score of reaction to white mold similar to that of cultivar G-122', which was used as check, and that has a good level of resistance to S. sderotiorum. ARANTES et al. (2010) did the same observation in relation to the scores of severity to angular leaf spot for the same progenies used in this work. This leads to inferring that the original population already had some level of physiological resistance to the mechanism of reaction for absorption to oxalic acid, once the average score (1,98) of reaction to oxalic acid of parents used in the beginning of the program of recurrent selection for resistance to angular leaf spot was low. The behavior of cultivar 'G-122' reported in this work is compatible with those of other studies (KOLKMAN & KELLY, 2000; ANTONIO et al., 2008; GONCALVES & SANTOS, 2010;).

In general, the variation and the levels of resistance of the progenies were similar to those of the parents (Tables 2 and 3). The gain with the selection for resistance to angular leaf spot probably resulted in gain for resistance to white mold, so the reaction to oxalic acid is due to mechanisms that are common for resistance to both diseases (CESSNA et al., 2000). Another favorable aspect is the lack of association of resistance with the type of grain, which make it possible to get resistant cultivars with the desired grain type.

It is important to point out the identification of progenies, which besides the superiority for angular leaf spot, architecture and grain type, they also stand out for resistance to white mold (MAV-1.7, MAV-3.36, MAVI-21 and MAVI-60).


Four selected progenies for resistance to angular leaf spot also show partial resistance to white mold.


To CNPq (National Research Council) for the financial support to the first author with a master's fellowship.


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Danuza Araujo de Souza (I), Fernanda Aparecida Castro Pereira (II) Juliana Andrade Dias (I), Monik Evelin LeiteI Joao Bosco dos Santos (I)

(I) Departamento de Biologia, Universidade Federal de Lavras (UFLA), Campus Universitario, 37200-000, Lavras, MG, Brasil. E-mail: * Autor para correspondencia.

(II) Departamento de Genetica, Escola Superior de Agricultura "Luiz de Queiroz", Universidade de Sao Paulo (USP), Piracicaba, SP, Brasil.

Received 10.20.12

Approved 10.24.13

Returned by the author 02.03.14
Table 1--Summary of the grouped analysis of variance for
reaction of common bean genotypes to white mold
through the method of oxalic acid.

FV                                      GL    QM

Experiments                             4     0,79 **
Genotypes                               53    1,33 **
Among progenies                         34    1,30 **
Among parents                           17    1,79 **
Progenies vs parents                    1     2,05 **
Regular treatment vs common treatment   1     4,83 **
Error                                   116   0,12
Total                                   173
CV(%) (1)                                     12,43
Mean                                          2,56
[h.sup.2] (%) (2)                             90,98
[h.sup.2] UL                                  85,36
[h.sup.2] LL                                  94,21
[] (3)                                95,38

** significant, at 1% of probability, by F test; (1) Coefficient of
variation; (2) Heritability estimates with upper ([h.sup.2.sub.UL])
and lower ([h.sup.2.sub.LL]) limits and superior; (3) selective

Table 2--Mean of the score reaction to white mold through the
reaction to oxalic acid of the 17 parents used in the
beginning of the program of recurrent selection for
resistance to angular leaf spot and the checks.

Parents        Mean *

And 277        0,83a
G122 **        1,10a
Carioca-mg     1,10a
Cal 143        1,20a
Ma 4.137       1,27a
Ci 128         1,37a
Comp.negro     1,53a
Anpat 8.12     1,67b
Mar/01         1,87b
Jalo           1,87b
Mar/02         2,27b
Perola         2,50c
Iapar 81       2,60c
G5686          2,67c
Ouro negro     2,90d
CI 140         3,03d
Corujinha **   3,10d
Esal 693       3,67e

* The means followed by the same letter belong to the same group
according to the test of Scott-Knott, at 5% of probability.

** Resistant check: G-122, susceptible check: Corujinha

Table 3--Mean of the scores of reaction to white mold through the
reaction to oxalic acid, of 35 progenies of common bean from seven
cycles of recurrent selection.

Cycle   Progenies       Mean

I       MA I--18.13     2,00b
        MA I -8.9       2,30b
        MA I--6.10      3,07d
        MA I--2.10      3,23d
        MA I--2.5       3,33d
        Mean of C-I     2,79

II      MA II--22       1,87b
        MAII--10        2,20b
        MAII--16        2,67c
        MAII--2         2,97d
        MAII--8         3,23d
        Mean of C-II    2,59

III     MAIII--17.179   2,20b
        MAIII--17.185   3,00d
        MAIII--9.91     3,40d
        MAIII--16.159   3,77e
        MAIII--16.155   4,37f
        Mean of C-III   3,35

IV      MAIV--15.203    2,57c
        MAIV--8.102     3,00d
        MAIV--18.524    3,20d
        MAIV--15.204    3,37d
        MAIV--18.259    4,3f
        Mean of C-IV    3,29

V       MAV--1.7        0,82a
        MAV--3.36       1,20a
        MAV--14.206     2,53c
        MAV--5.60       2,90d
        MAV--7.85       3,00d
        Mean of C-V     2,09

VI      MAVI--21        0,97a
        MAVI--24        1,87b
        MAVI--39        1,60b
        MAVI--60        1,00a
        MAVI--20        3,03d
        Mean of C-VI    1,69

VII     MAVII--34       3,07d
        MAVII--92       3,17d
        MAVII--129      3,87e
        MAVII--127      4,10f
        MAVII--244      4,10f
        Mean of C-VII   3,66

* The means followed by the same letter belong to the same group
according to the test of Scott-Knott, at 5% of probability.

** Resistant check: G-122, susceptible check: Corujinha
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Author:de Souza, Danuza Araujo; Pereira, Fernanda Aparecida Castro; Dias, Juliana Andrade; Leite, Monik Eve
Publication:Ciencia Rural
Article Type:Report
Date:Apr 1, 2014
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