Inheritance of resistance to Meloidogyne enterolobii in Psidium guajava x P. guineense hybrid

Abstract

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Genetic associations with resistance to Meloidogyne enterolobii in guava (Psidium sp.) using cross-genera SNPs and comparative genomics to Eucalyptus highlight evolutionary conservation across the Myrtaceae

“…Although we are aware that the preliminary analysis described above lacks direct supportive experimental data to ascertain the impact of miRNAs on Psidium response to RKN infection, these conjectures fit both the epistatic interaction model described previously [43] and the emerging view that specific developmental or stress events can be frequently subject to modulation by diverse miRNA families [70]. Therefore, it could be postulated that this region on chromosome 10 might constitute a distinct locus epistatic to the genetic locus on chromosome 3 harboring SNPs EuBR03s29615246 and EuBR03s30383415 potentially contributing to the M. enterolobii resistance response.…”

“…The untransformed Reproduction Factor (RF) phenotype varied from zero to 2.53 and when considered in a simple binary fashion only six of the 175 plants were scored with a reproduction factor RF> 1.0, thus classified as susceptible, while all others, with RF <1.0, were rated as resistant (S1 File). Although these binary counts fitted the same epistatic models proposed earlier in an inbred F 2 population [43] only one out of the 4,143 SNP data segregated in a 1:2:1 ratio indicating that the population did not behave as a regular inbred F 2 from a single F 1 plant but rather, as expected, as a mixture of outbred crossed offspring.…”

“…Studies in guava [64], coffee [65], peach and almond [66] have shown that disease status of RKN infected trees is related to symptoms triggered by nutritional imbalances in the concentration of nitrogen, calcium, manganese and magnesium in several tissues in adult plants. Furthermore, because our binary phenotypic data fitted the same epistatic models proposed earlier [43], we further considered the hypothetical involvement of a second genetic locus interacting with the underlying genes on the chromosome 3. Particularly, the associated SNP EuBR10s18721868 (Table 2; Fig 3) residing on the 700 kb long sequence JAGHRR010000188.1 of the P. guajava assembly looked promising enough in demanding further investigation.…”

Genetic associations with resistance to Meloidogyne enterolobii in guava (Psidium sp.) using cross-genera SNPs and comparative genomics to Eucalyptus highlight evolutionary conservation across the Myrtaceae

“…Studies in guava [ 68 ], coffee [ 69 ], peach and almond [ 70 ] have shown that disease status of RKN infected trees is related to symptoms triggered by nutritional imbalances in the concentration of nitrogen, calcium, manganese and magnesium in several tissues in adult plants. Furthermore, because our binary phenotypic data fitted the same epistatic models proposed earlier [ 47 ], we further considered the hypothetical involvement of a second genetic locus interacting with the underlying genes on chromosome 3. Particularly, the associated SNP EuBR10s18721868 ( Table 2 ; Fig 3 ) residing on the 700 kb long sequence JAGHRR010000188.1 of the P .…”

Analysis of the reproduction mode in Psidium spp. using the pollen:ovule ratio

“…The use of resistant cultivars is the best alternative for disease control. However, P. guajava genotypes resistant to guava decline are not available to date, although disease resistance has been reported in accessions of P. cattleyanum and P. guineense (Miranda, Souza, & Viana, 2011;Costa, Santos, & Castro, 2016). Moreover, the use of rootstocks for guava is unfeasible (Robaina, Campos, Marinho, Souza, & Bremenkanp, 2015).…”