Chromosome number and nuclear DNA amount in Psidium spp. resistant and susceptible to Meloidogyne enterolobii and its relation with compatibility between rootstocks and commercial varieties of guava tree

Souza, Aline das Graças; Resende, Luciane Vilela; Lima, Isabela Pereira de; Martins, Luíza Suely Semen; Techio, Vânia Helena

doi:10.1007/s00606-014-1068-y

Cited by 21 publications

(10 citation statements)

References 8 publications

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“…Psidium guineense and P. guajava display many morphological similarities (Costa and Forni-Martins, 2007), and in the present study, both behaved comparably with the two employed markers. In addition, P. guineense is a tetraploid species and P. guajava is a diploid species (Coser et al, 2012;Souza et al, 2015). Together with the results presented here, those data suggest evolutionary proximity.…”

Section: Discussionsupporting

confidence: 81%

“…Commercial seedlings were obtained from the plant nursery FRUCAFÉ, located in Linhares (ES -Brazil). Since it has been recently shown that the incompatibility of genome size and chromosome number may be related to a lack of success using wild species as rootstocks (Souza et al, 2015), information was also sought regarding the ploidy of the species, aiming to aggregate knowledge that may direct studies on their utilization (Table 1). Silva, 2013;4 Genotype with resistant phenotype provided by EMBRAPA/ CENARGEM; 5 Freitas et al, 2014;6 Genotypes with resistant phenotype identified by the research group; 7 Marques et al, 2012;8 Costa et al, 2012;9 (Ellshoff et al, 1995;Costa and Forni-Martins, 2007;Coser et al, 2012;Souza et al, 2015…”

Section: Plant Materialsmentioning

confidence: 99%

“…Meloidogyne enterolobii is a harmful nematode of the guava crop (Psidium guajava L.) (Pereira et al, 2009). Although genetic resistance to this nematode has not been reported in commercial guava genotypes, different studies have identified resistant species in the genus Psidium, such as P. cattleianum and P. friedrichsthalianum (Biazatti, 2013;Freitas et al, 2014;Souza et al, 2015). However, the genus Psidium comprises approximately 100 species (Landrum and Kawasaki, 1997), of which the majority are little known, as respective studies are still lacking.…”

Section: Introductionmentioning

confidence: 99%

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Relationship between Psidium species (Myrtaceae) by resistance gene analog markers: focus on nematode resistance

et al. 2017

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Guava (Psidium guajava L.) crop is severely affected by the nematode Meloidogyne enterolobii. Native Psidium species have been reported as sources of resistance against this nematode. Knowledge on the molecular relationship between Psidium species based on plant resistance gene analogs (RGA) can be useful in the genetic breeding of guava for resistance to M. enterolobii. In this study, RGA markers from conserved domains, and structural features of plant R genes, were employed to characterize Psidium species and establish genetic proximity, with a focus on nematode resistance. SSR markers were also applied owing to their neutral nature, thus differing from RGA markers. For this, species reported as sources of resistance to M. enterolobii, such as P. cattleianum and P. friedrichsthalianum, as well as species occurring in the Atlantic Rainforest and susceptible genotypes, were investigated. In 10 evaluated Psidium species, high interspecific genetic variability was verified through RGA and SSR markers, with intraspecific variation in P. guajava higher with SSR, as was expected. Resistant species were clustered by RGA markers, and differential amplicons among genotypes resistant and susceptible to M. enterolobii were identified. Knowledge on the molecular relationships between Psidium species constitutes useful information for breeding of the guava tree, providing direction for hybridization and material for rootstocks. Additionally, the genetic relationship between native species, which have been little studied, and P. guajava were estimated by RGAs, which were confirmed as important markers for genetic diversity related to pathogen resistance.

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Section: Discussionsupporting

confidence: 81%

Section: Plant Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Relationship between Psidium species (Myrtaceae) by resistance gene analog markers: focus on nematode resistance

et al. 2017

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“…The main symptoms caused by the attack of this phytonematodes are the small, deformed and yellowing leaves; delay and reduction in the seedlings development, and in cases of high infestations, poor plant development and declining production may occur [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…A survey carried out in several irrigated perimeters in the São Francisco Valley Region, in northwestern Brazil, revealed a high percentage of infected M. emarginata trees, raising the concern that this phytonematode may turn the cultivation unfeasible, as it has happened to guava orchards in that same region [7][8][9]. Genotypes with resistance or tolerance to phytonematodes may be used as rootstocks, as a low cost and sustainable alternative to chemical control methods and, can easily be adopted by growers without environmental and sanitary risks [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Resistance of Malpighia emarginata DC. Genotypes to Meloidogyne enterolobii Parasitism

Silva

Musser

Martins

et al. 2019

JEAI

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Aims: Considering the inexistence of M. emarginata cultivars resistant to M. enterolobii available for cultivation, and the scarcity of information about the severity of its parasitism in M. emarginata, the present study investigated the response of genotypes from the active germplasm bank of Universidade Federal Rural de Pernambuco to M. enterolobii parasitism, aiming the selection of resistant genotypes for use as rootstocks for commercial varieties. Study Design: The experimental design was completely randomized, with 21 genotypes and one independent matrix (control), with six replicates each. The experimental unit was represented by one plant per plot. Place and Duration of Study: Department of Agronomy, Universidade Federal Rural de Pernambuco – UFRPE - Brazil between June 2013 and July 2014. Methods: In the experiment, completely randomized design was adopted, with 21 genotypes from the AGB and one as a control for susceptibility. The M. emarginata cuttings were inoculated with 10,000 nematode eggs, and after 150 days, they were evaluated for the following parameters: Egg mass index, gall index, reproduction factor, number of eggs per gram of root, number of eggs per root system. Results: Twenty out of the twenty-two genotypes analyzed were susceptible. The genotypes 021-CMF and 037-CMF were considered resistant. To our knowledge, this is the first identification of M. emarginata genotypes resistant to M. enterolobii. Conclusions: These results are of great importance for the breeding and cultivation of the species since these two genotypes can be indicated for use as rootstocks and for breeding programs aimed at transferring resistance to other cultivars with desirable production characteristics that are susceptible to the phytonematode.

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Development of single nucleotide polymorphism markers and genetic diversity in guava (Psidium guajava L.)

Diaz‐Garcia

Padilla-Ramírez

2022

Plants People Planet

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Societal impact statement There are many understudied fruits of great economic and productive importance for regional agricultural hubs. Guava is an American fruit species with attractive nutritional and adaptability characteristics. However, in many countries like Mexico, its cultivation is still limited to small‐to‐medium size plantings and home gardens and depends on poorly controlled germplasm that diminishes productivity and expansion. Our study provides valuable insight to better understand guava diversity and generate high‐yielding, high‐quality, and better adapted materials. Supporting the study and development of understudied crops will provide us with more resources for facing climate change adversities and for diversifying cropping systems. Summary Guava (Psidium guajava L.) is a fruit crop species native to tropical and subtropical regions of America with great productive and economic potential due to its extensive environmental adaptability, nutritional value, and medicinal properties. However, the lack of molecular resources for accelerated breeding, limited knowledge about its evolutionary and domestication history, and unfavorable policies have limited its genetic improvement and broader adoption as a commercial fruit crop. Here, we present the first diversity study in guava employing genome‐wide single nucleotide polymorphisms (SNPs). Forty‐eight accessions collected from Mexico and other continents were examined with more than 6000 high‐quality SNP markers, which represents a marker density increase of ~30x compared with previous studies. Relationships between genetic groupings and geographic origins were not apparent in this diverse guava collection using principal component and structure analyses. Extensive germplasm exchange among guava‐producing regions and limited varietal control at commercial plantations might have contributed to ambiguities when defining the true origin and identities of existing germplasm materials. However, an analysis of domestication syndrome traits (fruit size and sugar) by wild or improved germplasm revealed several putative genomic regions under selection. Knowledge about germplasm origins and genetic relatedness, in conjunction with reliable molecular resources and better agronomic practices, is necessary to support breeding efforts and facilitate broader adoption of orphan crops such as guava, which have increasingly important roles in light of climate change adversities and in diversifying diets and food systems.

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Chromosome number and nuclear DNA amount in Psidium spp. resistant and susceptible to Meloidogyne enterolobii and its relation with compatibility between rootstocks and commercial varieties of guava tree

Cited by 21 publications

References 8 publications

Relationship between Psidium species (Myrtaceae) by resistance gene analog markers: focus on nematode resistance

Relationship between Psidium species (Myrtaceae) by resistance gene analog markers: focus on nematode resistance

Resistance of Malpighia emarginata DC. Genotypes to Meloidogyne enterolobii Parasitism

Development of single nucleotide polymorphism markers and genetic diversity in guava (Psidium guajava L.)

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