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Nanette Hope Sumaya, Sitaram Aryal, Bart Vandenbossche, Mike Barg, Verena Doerfler, Olaf Strauch, Carlos Molina and Ralf-Udo Ehlers

’s HSD test at P ⩽ 0 . 05 . The relationships between oxidative stress, longevity, the influence of storage temperature and persistence were assessed using the Pearson correlation test at P ⩽ 0 . 05 . Heritability is defined as the proportion of phenotypic variance due to additive effects of genes

Andressa C.Z. Machado and Jerônimo V. de Araújo Filho

-resistant cultivars, the identification of superior genotypes and knowledge about the variance and heritability for resistance is the basis upon which a well-designed breeding programme should be based (Tancred et al. , 1995 ). To our knowledge, there is no available information about these genetic traits

Olaf Strauch, John Mukuka and Ralf-Udo Ehlers

investigations indicate that the heritability of the desiccation tolerance is high, justifying a genetic selection for enhanced tolerance. This investigation screened the desiccation tolerance of 43 strains of Heterorhabditis spp. and 18 hybrid/inbred strains of H. bacteriophora . Dehydrating conditions measured

Fabio Biela, Claudia Regina Dias-Arieira, Andressa Cristina Zamboni Machado, Simone de Melo Santana-Gomes, Michelly Ragazzi Cardoso, Isabela Hernandes and Danielle Mattei

(Starr et al. , 2002 ). In order to develop resistant genotypes to P. brachyurus , the characterisation of genotypes and knowledge about the variance and heritability for resistance is the basis upon which a well-designed breeding programme should be based (Tancred et al. , 1995 ). To our knowledge

Judith Galeng Lawilao, B.P. Mallikarjuna Swamy, Arvind Kumar, Ma. Teodora Nadong Cabasan and Dirk De Waele

identify QTLs for resistance and tolerance to M. graminicola infection on the rice genome. Evaluation of the host response could lead to new information on the heritability of M. graminicola resistance and tolerance genes in rice germplasm. Moreover, this evaluation can also identify rice genotypes

Steven McMaster, Susan McKinney, Aaron Maule, Michael Kimber, Colin Fleming, Philip Donnelly and Michael Johnston

transgenic parasitic nematodes (ex- cluding the recent demonstration of heritable transgene- Vol. 9(3), 2007 303 Forum article Tab le 1. In vitro RNA interference data for plant-parasitic nematodes. Species (stage) Targe t g e n e d s R NA , m g m l − 1 ( b p ) dsRNA delivery method Detection P henotype (if

Katsumi Togashi, Hiroko Maezono, Koji Matsunaga and Satoshi Tamaki

). The project showed that 108 trees selected from 26 066 candidate trees that survived the pine wilt epidemic had a heritable trait of resistance to the disease, which was demonstrated by inoculating the grafted ramets and seedlings with B. xylophilus (Toda & Kurinobu, 2002). One hundred and eight trees

Ian Brown, Nancy Cohen and Randy Gaugler

strategy would be further exacerbated. In natural populations, such trade-offs might be addressed in terms of heritable variation in the control of behavioural rates. Several Clock genes perform this function in C. elegans (Wong et al. , 1995; Lakowski & Hekimi, 1996) hypothetically,by interaction between

Tina Kyndt, Hongli Ji, Bartel Vanholme and Godelieve Gheysen

(Wassenegger, 2005 ; Matzke et al. , 2007 ). This process presumably affects the binding of transcription factors and causes a permanent and heritable loss of gene expression. If hairpin constructs are subject to TGS, their effectiveness in downregulating the target genes is precluded (Kerschen et al

Vanessa S. Mattos, Cleber Furlanetto, Joelma G.P. Silva, Danilo F. Dos Santos, Maria Ritta A. Almeida, Valdir R. Correa, Antônio W. Moita, Philippe Castagnone-Sereno and Regina M.D.G. Carneiro

used (Reproduction Factor). Soybean resistance to M. incognita and M. javanica has high heritability and is based on a few genes (Luzzi et al. , 1995 ; Silva et al. , 2001 ). The susceptibility of soybean cultivars tested in our study against populations of Meloidogyne spp. from Cerrado