Selection of interspecific &lt;i&gt;Psidium&lt;/i&gt; spp. hybrids resistant to &lt;i&gt;Meloidogyne enterolobii

Rodrigo Moreira Ribeiro,Vicente Martins Gomes,Paulo Ricardo Dos Santos,Ricardo Moreira Souza,Alexandre Pio Viana

doi:10.4025/actasciagron.v41i1.42702

Selection of interspecific <i>Psidium</i> spp. hybrids resistant to <i>Meloidogyne enterolobii

Rodrigo Moreira Ribeiro, Vicente Martins Gomes + Show 3 more

Open Access

https://doi.org/10.4025/actasciagron.v41i1.42702

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Abstract

Since 2001, the disease known as 'guava decline', resulting from the interaction between the phytonematode Meloidogyne enterolobii and the fungus Fusarium solanie, has caused direct and indirect economic losses to the entire guava production chain. Given the lack of sources of resistance in guava genotypes, interspecific hybrids of Psidium spp. were obtained for resistance to the nematode M. enterolobii. To classify the level of resistance of the interspecific hybrids, we evaluated the plant classification methodologies proposed by Oostenbrink (1966) and Moura and Régis (1987). Estimates of genetic parameters were obtained using the REML/BLUP approach. Interspecific hybrids resistant to M. enterolobii were selected that can be used as rootstocks or in new crosses for the development of the guava breeding program.

Highlights

Brazil stands out in the world scenario for guava (Psidium guajava L.) production, where it is grown in commercial orchards across the entire national territory
The parasitism of the phytonematode Meloidogyne enterolobii predisposes guava plants immune to Fusarium solani to extensive degradation of the roots caused by this fungus, which leads to nutritional deficiencies, chlorosis, burn of the leafedges, leaf fall, drastic decline in yield, and plant death, in an irreversible process that takes only a few months (Gomes, Souza, Silva, & Dolinski, 2008; Gomes et al, 2014; Gomes et al, 2017)
The phenotypic variance values were higher than the respective genotypic variance values for all traits

Summary

Introduction

Brazil stands out in the world scenario for guava (Psidium guajava L.) production, where it is grown in commercial orchards across the entire national territory. The parasitism of the phytonematode Meloidogyne enterolobii predisposes guava plants immune to Fusarium solani to extensive degradation of the roots caused by this fungus, which leads to nutritional deficiencies, chlorosis, burn of the leafedges, leaf fall, drastic decline in yield, and plant death, in an irreversible process that takes only a few months (Gomes, Souza, Silva, & Dolinski, 2008; Gomes et al, 2014; Gomes et al, 2017) This leads to considerable economic losses to farmers; in 2009, losses were estimated at over US$ 70,000 (Pereira, Souza, Souza, Dolinski, & Santos, 2009). The use of resistant cultivars is the most viable strategy, given that several strategies for the control or management of this disease have been evaluated but no prospects for a short-term solution have been made (Freitas, Correa, Motta, Gomes, & Carneiro, 2014; Gomes et al, 2017; Freitas et al, 2017)

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