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- Author or Editor: M. Rafique Uddin x
Abstract
Selected F3 and F4 lines of different origin were evaluated at high temperature (26° night and 35°C day) in the greenhouse along with several known heat-sensitive and heat-tolerant tomato (Lycopersicon esculentum Mill.) cultivars. A number of the selected lines had fruit set comparable to the tolerant cultivars Saladette, Ohio 7663, BL 6807, and Chico III. The expected greater fruit set of the tolerant cultivars vs. that of the sensitive cultivars was observed. High fruit set in this study was not associated with high seed number in the majority of tolerant cultivars evaluated.
Abstract
Efficiency of somaclone production was examined using 10 processing tomato cultivars and 18 growth regulator treatments. Although zeatin has been reported to induce shoot development most readily, a combination of IAA (5.7 µmol·liter–1) and kinetin (4.7 µmol·liter–1) was found to be equal to zeatin in shoot regeneration efficiency and reduced the time required for shoot production. Rooting was achieved by transplanting the in vitro-produced shoots to Pro-Mix under intermittent mist in a greenhouse. Chemical names used: (E)-2-methyl-4-(1H-purin-6-ylamino)-2-buten-1-ol (zeatin); 1H-indole-3-acetic acid (IAA); N-1-furanyImethyl)-1-H-purin-6-amine (kinetin).
Abstract
Stability and variation of fruit yield, soluble solids, and citric acid content of eight tomato (Lycopersicon esculentum Mill.) cultivars over 6 years were investigated. The cultivar Ohio 7814 exhibited above-average yield and yield stability. The cultivars showed a wide range of variation for percent soluble solids and citric acid. The cultivar Ohio 7870 was least variable in soluble solids, and ‘Heinz 2653’ most variable. Regarding citric acid, ‘Heinz 722’ had the largest seasonal variation, whereas ‘Ohio 7814’ had the least. A linear relationship between fruit yield and percent soluble solids was not detected on the basis of 6 years of data.