Eleven candidate genes were selected based on previous studies in Arabidopsis[33] (link) and grapevine [2] (link), [26] (link), [28] (link), [29] (link), [33] (link), [34] (link). Nine of these genes were formerly described as reference genes for grapevine downy mildew pathosystem in later inoculation time-points (1–7 days post-inoculation): V-type proton ATPase 16 kDa proteolipid subunit (VATP16), 60 S ribosomal protein L18 (60S), Ubiquinol-cytochrome c reductase complex chaperone (UQCC), Small nuclear ribonucleoprotein SMD3 (SMD3) from Gamm et al. [28] (link); Elongation factor 1α (EF1α) from Trouvelot et al. [34] (link), Ubiquitin-conjugating enzyme (UBQ) and SAND family protein (SAND) from Reid et al. [26] (link), glyceraldehyde-3-phosphate dehydrogenase (GAPDH) from Selim et al. [29] (link) and Actin (ACT) from Figueiredo et al. [2] (link). The other two gene homologous to Arabidopis polypyrimidine tract-binding protein 1 (AT3g01150) and D1 subunit of photosystem I and II reaction centers (ATCg00340) [33] (link), were retrieved from the grapevine TIGR database v. 8 as PTB2 protein (TC109121) and PsaB (TC134081), respectively. Grapevine specific primers were designed with Primer Express software version 3.0 (Applied Biosystems, Sourceforge, USA) using the following parameters: amplicon length between 75 and 250 bp; size: 20±2 bp; melting temperature (Tm): 60±2 °C; GC content: ±50%.
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