, Volume 9, Issue 2, pp 321-329
Date: 08 Nov 2012

Heritability for resistance to Puccinia psidii Winter rust in Eucalyptus grandis Hill ex Maiden in Southwestern Brazil

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The climates of the central and southern regions of São Paulo state in Brazil favor pathogens such as Puccinia psidii Winter, which causes a common and severe disease in Eucalyptus plantations under 2 years old. We studied genetic parameters including genotype by environment interaction (G × E) of resistance to P. psidii rust in Eucalyptus grandis at nine sites in São Paulo State. Open-pollinated progeny from ten ‘provenances’ were established in a randomized complete block design; at individual sites there were from 134 to 160 progenies, from four to eight blocks, and five to six trees per plot. Significant provenance and progeny(provenance) differences were detected, as was G × E involving progeny(provenance). However, the G × E involved little if any rank changes, indicating that selection can be done efficiently at a single site, if the disease level is sufficient. The estimated coefficient of genetic variation among the progeny within provenances \( \left( {{{{\widehat{\mathrm{CV}}}}_{\mathrm{g}}}} \right) \) was high and variable among the sites (ranging from 11 % to 36.7 %), demonstrating different expression of genetic variability among the sites. The estimated heritability at the individual-tree level \( \left( {{{\widehat{h}}^2}} \right) \) and within a plot \( \left( {\widehat{h}_{\mathrm{w}}^2} \right) \) ranged from low to intermediate (ranging from 0.04 to 0.46) and was high at the progeny-mean level \( \left( {\widehat{h}_{\mathrm{f}}^2} \right) \) (ranging from 0.30 to 0.86). Our study shows good prospects of controlling this disease by selection among and within progenies in a single site.

Communicated by R. Burdon