The study was undertaken with a view to establish a protocol for in vitro plant regeneration from shoot tip explants of banana. Different concentrations of BAP
An experiment was conducted at Rooftop Garden under 2abotech lab, Department of Horticulture, Sher-e-Bangla Agricultural University, Bangladesh during November 2012 to July 2013 to find out growth and yield performance of potted Gerbera against foliar application of different concentration of Gibberelic acid (GA 3). Three varieties viz. V 1 (red), V 2 (brick red), V 3 (pink) and four GA 3 concentrations viz. G 0 : 0 ppm, G 1 : 100 ppm, G 2 : 150ppm, G 3 : 200 ppm were evaluated in the experiment. Maximum number of flower (22.1), flower bud diameter (3.6 cm), peduncle length (29.3 cm), peduncle diameter (1.9 mm) and flower head diameter (8.6 cm) were found from V 2 while G 2 provided maximum number of flower (24.0), longest peduncle (28.3), maximum peduncle diameter (1.7) but G 2 and G 3 both provided maximum flower bud diameter (3.1 cm) and flower head diameter (8.1 cm). V 2 G 2 was found as the best treatment combination.
An experiment was conducted to evaluate the growth and flowering performance of chrysanthemum cultivars. Thirty two chrysanthemum cultivars coded from V1 to V32 were used in the experiment. Plant height, number of branch per plant, leaf area, number of leaf per branch, chlorophyll content, days to flower bud initiation, days to first petal spread, days to final bloom, number of flower bud per plant, number of flower per branch, number of flower per plant, bud diameter at initiation stage, bud diameter at mature stage, flower head diameter, stalk length and flower durability in plant (days to 50% flower senescence) for different cultivars varied significantly. Number of flowers per plant ranged from 4.3 to 194.6, flower head diameters varied from 2.8 to 17.6 cm and stalk lengths were from 4.4 to 20.1 cm. Amongst the chrysanthemum cultivars V15 (BARI chrysanthenum1) was the maximum flower producing cultivar, while V1 produced the largest flowers and flowers from the V21 had the longest shelf-life. These variations might help in classifying chrysanthemum, for pot cultivation and cut flower, based on their flowering quality which will be beneficial for growers.
An experiment was conducted to evaluate the postharvest life of cut gerbera cultivars under the different preservative solutions. Three (yellow, magenta and orange) cut gerbera cultivars were placed on nine different preservative solution viz. ) following completely randomized design. Yellow gerbera provided the maximum petals water content (52.4%) when placed in T9 and also provided 8.0 days more vase life compared to the control. For magenta and orange gerbera, maximum petals water content (magenta: 56.3% and orange: 63.0%) in T8 and also 6.9 days more vase life than control.
Silvar Thiosulphate (50-ppm) were used as vase solution to increase post-harvest life of gerbera. Minimum score for petal discoloration (1.6) and flower freshness (3.8) was found from T9. Stem bending (13.7 days), petal discoloration (10.5 days) and petal shriveling (13.3 days) were also found to be delay in T9 treatment. Maximum stem diameter (7.2 mm), solution uptake (72.7 ml), petal water content (72.7%) and vase life (13.3 days) was found from T9 followed by T6. Sugar + Silvar Thiosulphate and Sugar + Citric Acid can lead to extend longevity of cut gerbera by reducing the fungal infection also by increasing solution uptake and supplementing carbohydrate.
An experiment was conducted to evaluate the performance of rose cultivars and their categorization based on color, fragrance and use. Field experiment included forty four rose cultivars coded from V1 to V44. It was found that all rose cultivars varied significantly for the studied characters like number of shoots/plant, leaf area, chlorophyll content, number of flower/plant and petals per flower. Rose cultivars were categorized in nine groups in accordance to color, three groups in accordance to the fragrance and two groups in accordance usage excluding the wild type. V3 (Tajmahal), V4 (Yellow star), V14 (Lavender gold), V16 (Compassion), V21 (SAU hero), V23 (Yellow gold), V25 (Sleepy moon), V26 (Sweet doll), V30 (Chrysanthemum rose) and V35 (Sweet sakata) cultivars were found as the cut flowers and rest were pot/bedding flower. Among the 44 cultivars desired one could be isolated easily for the specific purpose. Roses are vegetatively propagated and they are selected for defined traits such as stem length, flower bud, flower number, flower size and flower qualities (shape, color, fragrance). Breeding to modify a single characteristic generally results in changes to other characters as well.
An experiment was conducted to reduce the entrance of arsenic on rice plant. Experiment consisted three different density of the trap plants viz. P1: No P. vittata (control); P2: four P. vittata plant per m 2 and P3: eight P. vittata plant per m 2. Inter planting of four P. vittata per m 2 reduced 96.24 % and eight P. vittata per m 2 reduced 97.01% arsenic accumulation into rice. Maximum yield was found from P2 (34.2 g per plant) which was statistically similar with P3 (32.9 g per plant) while minimum was found from P1 (30.0 g per plant). Highest amount of arsenic accumulation was found from P1 in rice grain (1.55 ppm), husk (5.57 ppm) and straw (39.78 ppm). Arsenic accumulation was found in rice grain (0.02 ppm in both P2 and P3), husk (0.60 and 0.58 ppm in P2 and P3 respectively) and straw (1.05 and 1.00 ppm in both P2 and P3 respectively). Concerning both yield of rice and arsenic concentrations in rice plant, it can be recommended to interplant four P. vittata plant per m 2 area as a trap plant to reduce arsenic entrance into rice plant from soil which can keep away of arsenic pollution in food chain.
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