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Van Nguyen T.,Hue University | Chu T.D.,Fruit and Vegetable Research Institute | Le H.V.,The University of Da nang | Le T.V.,University of Industry | And 3 more authors.
Acta Horticulturae | Year: 2010

To investigate the effects of newly commercialized chemical, namely ReTain (AminoethoxyVinylGlycine) or AVG, on Cavendish banana fruits grown in the central Vietnam, a set of experiments has been conducted. For this purpose, ReTain was applied by spraying directly on the fruits two weeks before their harvest. The concentrations of ReTain varied from 600 to 900 ppm with 100 ppm interval (i.e. 600, 700, 800, and 900 ppm). Non-sprayed fruits were served as control. After twoweek period, the fruits were harvested, packed in standard banana cardboard boxes and stored at ambient conditions (20-25°C, 75-85% RH). To determine responses of banana fruits to ReTain treatment, the measurements of specific physicochemical and physiological characteristics, which represent banana postharvest behaviors, have been conducted and recorded accordingly. Experiment results indicated that fruits treated with ReTain of concentration of 0.8% (or 0.8 g/L) have been considered the most prominent. The fruits, treated with 800 ppm ReTain, were firmer, respiration rate and repining rates were lower, the postharvest losses were much less over other fruits, fruit shelf-life has been extended to 16 days against 8 days for the controlled fruits. Source

The transformation of tomato (Solanum lycopersicum) through Agrobacterium tumefaciens is still far from being routine, particularly when it comes to commercial varieties. In the present paper, we present an efficient and simple protocol for leaf disc transformation of three Vietnamese tomato cultivars (DM8, MTS, FM372C) by comparing shoot regeneration media for expanding leaves and examining different parameters of inoculation, co-culture and selection conditions. The present transformation method requires neither feeder layers of cell suspension cultures nor pre-culture. The data clearly show that appropriate cytokinin- and auxin combinations and concentrations provide competent tissues for transformation. Supplementing of 8 μM trans-zeatin and 5 μM indoleacetic acid (IAA) into pre-treatment, inoculation and co-culture media resulted in higher frequency of transformation and stronger GUS-expression than that of media supplemented with 4 μM trans-zeatin and 2 μM IAA. The experiments also exhibited that tomato leaf tissues were more sensitive to glufosinate after inoculation with Agrobacteria compared to the untreated controls, so a more sophisticated scheme for the glufosinate selection had to be established. Source

Hung N.Q.,Fruit and Vegetable Research Institute | Thoa D.K.,Fruit and Vegetable Research Institute | Huong N.T.T.,Fruit and Vegetable Research Institute
Acta Horticulturae | Year: 2011

A study on the effect of planting density on growth, development and yield of a Chinese clone of 'Smooth Cayenne' pineapple in irrigated cultivation was carried out at the Nghe An Fruit Company in Nghe An province from July 2007 to October 2009. Planting densities in the experiments were from 57,000 to 78,000 crowns/ha; fertigation was done through a drip irrigation system (TORO Australia Pty. Ltd.). Increasing planting density increased plant height and decreased width of the 'D' leaf. Plants were forced with calcium carbide during the off season and flowering percentage gradually declined as planting density increased. When the planting density exceeded 71,000 crowns/ha, average fruit weight was 1.25-1.32 kg, which was 20.0-21.8% lower than the average fruit weight at 66,000 crowns/ha, which density produced the highest yield. At 66,000 crowns/ha the theoretical yield was 85.70-86.32 tons/ha and the lowest yield, which was obtained at 78,000 crowns/ha was 68.91-73.27 tons/ha. Different planting densities did not significantly affect quality criteria of 'Smooth Cayenne' pineapple fruit. Source

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