Methods Plant material Fruits Navitoclax Bcl-2 of the four genotypes were collected at four devel opmental stages, 10, 20, 30 Days After Anthesis and at the mature stage. The mature stage was deter mined based on the formation of the abscission zone in the two climacteric genotypes Dulce and Vedrantais and based on highest Total Soluble Solids for the two non climacteric fruits PI161375 and Piel de sapo. Hermaphrodite flowers were collected on secondary axes at three developmental stages, C1, C3, and C5, which correspond to initial, medium and late developmental stages of flowers before anthesis, respectively. Specifically, C1 is the most initial stage where the flowers are around 1 mm in the longitu dinal axis, C3 is the stage where the future fruit shape is already defined and first stamens are visible, and C5 is the stage just before anthesis.

MNSV Ma5 infected cotyledons, leaves and roots were produced from melon cultivar Piel de Sapo T111 grown in growth cham ber with a 16 hour, 25 C light and 8 hour, 18 C dark regime. Specifically, nine day old cotyledons were inocu lated mechanically with fresh inoculums of MNSV Ma5 and harvested after 4 days when necrotic lesions started to appear with high incidence. Leaves and roots were harvest 10 and 8 10 days after inoculation with MNSV Ma5, respectively. Undifferentiated callus growth was induced from cotyledon sections of the four cultivars. Fifty seeds from each genotype were surfaced sterilized in 70% ethanol for 2 min, followed by 1% NaOCl with 0. 1% Tween 20 for 20 min, and rinsed three times with sterile distilled water.

Under a dissecting microscope, seed coats were removed, a small incision was done on the integuments, and embryos were hydrated overnight in sterile distilled water. Embryo axis was removed from the de coated seeds. Depending on the genotype, four to six transversal cotyledon sections were dissected from each seed and cultured in Petri dishes containing callus induction medium. Cultures were incubated in the dark, at 28 C, and subcultured every three weeks to fresh medium. Callus induction medium was the MS, supplemen ted with 30gL 1 sucrose, 8gL 1 Bacto agar, 5uM 2,4 dichlorophenoxyacetic acid, and 1uM Kinetin. Five months after initiation, 100 Petri dishes, 10 cm wide, with six to eight calli were produced from each genotype. Total RNA preparation, cDNA library construction and cDNA clone sequencing Total RNAs from callus and MNSV infected tissues were extracted following the TRI reagent protocol, including two additional chloroform purifica tion steps. Fruit total RNAs were prepared from slices of the fruit Cilengitide that included both flesh and rind using the protocol described by Portnoy et al.