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Morphological, Growth and Biochemical Features of Dipogon Lignosus (l.) Verdc. Bean

Dr. Md. Solaiman Ali Fakir
Professor
Department of Crop Botany, Bangladesh Agricultural University Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

Lignosus bean is a perennial vine of Fabaceae. Green seeds, tender leaves and twigs are used as vegetable and dry split cotyledons as pulse soup. Canopy characters, growth and biochemical features of the two genotypes, ‘G₁’ and ‘G₂’, of Lignosus bean were studied. Numbers of leaf meter^-1 vine, % fertile inflorescence plant^-1, green pod yield plant^-1 and dry mass plant^-1were greater in G1 genotype (10.11, 73.17%, 3.21 kg and 2.68 kg, respectively) than G₂ genotype (9.55, 66.52%, 2.80 kg and 1.97 kg, respectively). On the other hand, leaflet area, inflorescence length, number of node and pod inflorescence^-1_, fresh pod length and width, hundred fresh seed weight and shell ratio were higher in G2 genotype (33.26 cm²_,9.47 cm, 24.33, 3.51, 6.99 cm, 1.55 cm, 125.08 g, 83.61%, respectively) than that in the G₁ one (29.04 cm²_,0.61 cm, 8.32 cm, 16.0, 2.52, 6.56 cm, 1.35 cm, 80.57 g, 72.69%, respectively). Total soluble solids of seed; and total chlorophyll of leaf and seed were also higher in G₂ (31.43%, 59.19 mg/l and 0.83 mg/l, respectively) but Vitamin C of green seed was higher in G₁ genotype (43.84 mg%). It may be concluded that the two genotypes can be distinguished on the characters of leaf, flower and seed.

Keywords: Canopy character, Genotypes distinction, Dipogon lignosus

Location: Mymensingh

Start Date: 00-05-2008

End Date: 00-02-2009

Program Area: Variety and Species

Commodity: Faba bean

Objectives:

The current research work was carried out to compare the morphological, growth and biochemical characters between G₁ and G₂ genotypes of Lignosus bean.

Methodology:

The experiment was conducted at the Field Laboratory, Department of Crop Botany, Bangladesh Agricultural University, Mymensingh (24º75´ N and 90 º 50´ E), at the elevation of 18m above the sea level between May 2008 to February 2009. Plant materials: Two genotypes of Lignosus bean (2n=22) viz., one is exotic (‘Trinidad’, G₁’) and another is indigenous (‘chittagong’, G₂’) were considered. The field experiment was laid out in randomized complete block design with three replications. The seedlings were raised in poly bag with three seeds in each. The seedlings were transplanted at 15^th days after sowing (DAS) in the plot of the main field and thinned to one healthy plant/pit between 25 and 30 DAS. The unit plot size was 6.0 m² (3m×2m) to accommodate one pit (50cm×50cm×50cm) per plot and one plant per pit. Well decomposed cowdung (3.20 kg/pit) and triple super phosphate (0.06 kg/pit) were applied as basal dose. Moreover, urea (0.02 kg/pit) and muriate of potash (0.06 kg/pit) were also used in three splits as top dress at 20, 30 and 40 DAS as the source of nitrogen and potassium, respectively. The blocks and plots were separated by 1.0m and 0.5m distance respectively. The individual plant was supported by bamboo trellis (3m×2m). The recommended cultural and management practices were followed (Rashid, 1983). Sample and data recording: At physiological maturity (PM) of the most pods(changing deep green to light or yellowish green colour), three vines from each replication with one meter (m) length were randomly sampled. Number of nodes and leaves was counted in one meter vine. Number, length and diameter of inflorescence in that vine were recorded. The number of fertile inflorescence per plant, which produced at least one pod was also recorded. Total number of pods (TNP) per plant was estimated by following the method of Fakir et al (1998), as follows: TNP/plant = Number of inflorescence/plant ? Number of nodes/inflorescence ? Number of pods/node. Total number of potential pods or total number of reproductive units (TRU) was calculated as follows: TRU/plant = No. pods + No. flowers + No. buds + No. scars. Fresh pod yield per inflorescence was estimated by multiplying the number of pods per fertile inflorescence by average fresh pod weight. The summation of pod weight of all the fertile inflorescence in a plant gave pod yields per plant. Leaflet area was recorded from at least 20 leaves from each replication (Leaf area meter, Model LI-3000, Licor, USA). The plants were harvested at 60-70% physiological pod maturity and different plant parts were dried in the oven (at 80°C ± 2 for 48 hours) and weighed. Total soluble solids (TSS) i.e. both reducing and non-reducing sugar of seeds were recorded using Refractometer (Model No.N-1E, Series 2111-W10, Atago, Japan) at 20ºC temperature in % brix unit. Chlorophyll content (total chlorophyll i.e. chlorophyll-a plus chlorophyll-b) of leaf and seed was determined (Yoshida et al., 1976). Vitamin C (Bessey and King, 1933) and Iron (Fe) content (Golterman and Clymo, 1971) of green seed was also determined. The collected data with three replications on various characteristics under study were compiled and analyzed statistically to find out the means. Level of significance and t-value was measured by paired samples test.

Source of Information: J. Bangladesh Agril. Univ. 10(1): 43–48, 2012

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Results of morphological characters revealed that, G₂ genotype had bushier and heavier canopy as compared to G₁ genotype. But magnitude of reproductive parameters including number of inflorescence per plant, percentage of fertile inflorescence, number of flowers per inflorescence, number of observed pods per plant and green pod yield were higher in G₁. Two genotypes can be distinguished on the characters of leaf, flower and seed.

Knowledge Management: Journal