Section 5
Chapter 4,160

Families of loblolly pine that are the most stable for resistance to fusiform rust are the least predictable

McKeand, S.E.; Amerson, H.V.; Li, B.; Mullin, T.J.

Canadian Journal of Forest Research 33(7): 1335-1339


ISSN/ISBN: 0045-5067
DOI: 10.1139/x03-050
Accession: 004159712

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In an extensive series of trials with open-pollinated families of loblolly pine (Pinus taeda L.), resistance to fusiform rust disease (caused by Cronartium quercuum (Berk.) Miyabe ex Shirai f. sp. fusiforme) at individual test sites was relatively unpredictable for the families deemed most resistant. The most resistant families were also the most stable for performance across test sites, with stability defined as the slope of the regression of family means for rust infection versus site means for rust infection. A family's R-50 value (its predicted rust infection level when the site mean infection is 50%) was correlated to its stability parameter or slope (r=0.78).