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- Author or Editor: M. E. Herrington x
Abstract
Bacterial wilt (Pseudomonas solanacearum E.F. Smith biovar III) causes substantial losses in susceptible tomato (Lycopersicon esculentum Mill.) cultivars in coastal Queensland from late spring to autumn (3). Verticillium wilt (Verticillium dahliae Kleb. race 1) can be a major disease from autumn to early spring. A previously released cultivar, Scorpio (3), is resistant to bacterial wilt and Fusarium wilt (Fusarium oxysporum Schlecht, ex Fr.f.sp. lycopersici (Sacc.) Snyd. and Hans, race 1), but lacks resistance to Verticillium wilt. Fruit of this cultivar are relatively soft. ‘Redlands Summertaste’ a hybrid, was developed to provide a locally adapted tomato cultivar in which resistances to bacterial, Verticillium and Fusarium wilts are combined with good fruit quality.
Abstract
‘Redlands Long White’ cucumber (Cucumis sativus L.) was developed by Redlands Horticultural Station to provide the Queensland cucumber industry, seedsmen, and breeders with a high quality white-skinned long cucumber. In addition to high consumer acceptability, ‘Redlands Long White’ is productive and has resistance to downy mildew [Pseudoperonospora cubensis (Berk, et Curt) Rost.] and should carry resistance to some isolates of powdery mildew [Sphaerotheca fuliginea (Schlecht ex Fr.) Poll.].
Abstract
The sweet, juicy, red flesh of watermelon [Citrullus lanatus (Thunb.) Matsum. and Nakai] is a popular dessert in Australia, while the bland, white, firm-textured flesh of pie-melons, also Citrullus lanatus (Thunb.) Matsum. and Nakai, is used in jam making. Red flesh color of watermelon is a monogenic trait and recessive to white (7). Both bitter and sweet forms of C. lanatus occur and are naturalized in inland areas of tropical and subtropical Australia (3, 9). Bitter fruit of commercial watermelon occasionally have appeared in markets in Australia. A mutation within a commercial cultivar has been considered as the source of plants producing bitter fruit (1,3,6). The nonbitter characteristic of fruit in commerce is conferred by a single recessive gene (1, 7). However, in bitter fruit of C. lanatus, the concentration of Cucurbitacin E glycoside, the principal compound sensed as bitterness (2, 5), is influenced by a modifier gene or genes (1, 7). The concentration of the glycoside in bitter fruit of Accession 242 (a wild type), and of the bitter mutant of the commercial cultivar Hawkes-bury, are 240-590 mg°kg−1 and 1500-2100 mg°kg−1, respectively, and 910-1240 mg °kg−1 in the F1 (1, 2). The concentration of Cucurbitacin E glycoside in nonbitter fruit of C. lanatus is reported to be 0 mg°kg−1 (1) and 60-90 mg°kg−1 (8).
Abstract
Susceptible tomato (Lycopersicon esculentum Mill.) cultivars in coastal Queensland may suffer substantial losses from bacterial wilt [Pseudomonas solanacearum (Smith 1896) Smith 1914 biovar III] from late spring to autumn (3). Verticillium wilt (Verticillium dahliae Kleb. race 1) can be a major disease from autumn to early spring. A hybrid cultivar, Redlands Summertaste (1), recently was released and is resistant to bacterial wilt, verticillium wilt, and fusarium wilt [Fusarium oxysporum Schlecht, f.sp. lycopersici (Sacc.) Snyder & Hansen race 1 and 2]. However, although this cultivar has high yields (75 to 92 t·ha–1), the jointed fruit attachment and indeterminate growth habit limit returns to growers who have high labor costs. ‘Redlander’ was developed as an inbred cultivar to provide a locally adapted tomato in which resistances to bacterial, verticillium, and fusarium wilts are combined with good fruit quality, jointless pedicel, and determinate growth habit.