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Research Detail

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SC Chanda
Laboratory of Plant Systematics, Department of Crop Botany, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

AM Mridul
Laboratory of Plant Systematics, Department of Crop Botany, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

A Sagar
Laboratory of Plant Systematics, Department of Crop Botany, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

AKMG Sarwar*
Laboratory of Plant Systematics, Department of Crop Botany, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

An experiment was carried out at Plant Systematics Laboratory of the Department of Crop Botany, Bangladesh Agricultural University, Mymensingh to find out the effect of seed size on germination and seedling growth of three Sesbania species. Seed size was graded as small (3.1–3.5 mm), medium (3.6–4.0 mm) and large (4.1–4.5 mm); and three Sesbania species viz. S. bispinosa, S. cannabina and S. sesban, were used as experimental materials. The treatments were arranged in factorial experiment laid in completely randomized design having four replications. Though the effect of seed size on germination and seedling growth parameters followed similar trend, significant differences were observed among these three Sesbania species. Medium-sized seed produced the highest percentage of emergence and germination, and large-sized seed produced the highest seedling length, vigour index, and total biomass; although the numerical values did not differ statistically. The small-sized seeds were poor performer in all aspect of germination and seedling growth descriptors. The correlation matrix analyses showed that seed size, both length and/or width, highly correlated with root and seedling length, base diameter, vigour index and biomass yield of Sesbania spp. The medium to large-sized seed sown at relatively higher seed rate could be helpful for higher biomass yield of Sesbania spp. especially at the early growth stages.

  Sesbania, Seed size, Germination, Vigour, Seedling growth
  Department of Crop Botany, Bangladesh Agricultural University, Mymensingh
  00-05-2017
  00-06-2017
  Seed Technology
  Vegetables

To evaluate the effect of seed size on germination, vigour and seedling growth descriptors of three Sesbania species.

The experiment was conducted at Plant Systematics Laboratory of the Department of Crop Botany, Bangladesh Agricultural University, Mymensingh, during the month of May to June 2017, to evaluate the effect of different seed sizes on germination, vigour as well as seedling  growth in three  Sesbania species  viz.

S. bispinosa, S. cannabina and S. sesban. Seeds were collected from the previous year plants raised on Field Laboratory of the Department of Crop Botany, Bangladesh Agricultural University and harvested seeds were stored in a polythene bag. Seeds were graded, based on length, into three categories viz. small (3.1–3.5 mm; 16.4g 1000-seed–1), medium (3.6–4.0 mm; 16.8g 1000-seed–1) and large (4.1–4.5 mm; 17.2g 1000-seed–1) which were measured with digital slide callipers  from  each  species.  After  seed  size grading,

200 seeds in each size were weighed with digital electric balance. Healthy seeds were used as experimental materials. The treatments were arranged in a completely randomized design having four replications. In a Petri dish, 50 seeds from each group were sown in the mixture of sand: soil: compost in 1:1:1 ratio. Desired soil moisture was maintained using water up to ten days. The seedlings emergence was considered just after coming out of cotyledons above the soil surface (Mishra et al., 2014). For the judgment of growth and dry weight, 10 randomly selected seedlings from each replication were harvested from each Petri dish. Shoot length, root length, base diameter, length & width of cotyledons and length & width of leaf were measured using a ruler scale and digital slide callipers. Fresh & dry weights of seedling were measured by electric digital balance at ten days of age. Fresh samples were oven dried at 72±2 0C for 72 hrs. The cumulative germination (CG) percentage of seeds was counted daily up to 10 days. The CG percentage of seeds was calculated by the following formula (Bewley and Black, 1994).

% CG = (∑n / N) × 100

Where n is the number of seeds germinated at each day and N is the total number of seeds sown.

Vigour index (VI) was considered based on the mean shoot and root length; multiplied by the percentage of seed germination on 10th day/final day (Shreelalitha et al., 2015).

VI= (Mean shoot length + Mean root length) × Germination percentage

The collected data were analyzed by using Statistix 10 software, arithmetic mean, standard deviation, the coefficient of variation of seeds and seedlings attributes of three Sesbania species were compared with Duncan’s new Multiple Range Test (DMRT) at 5% probability. Matrix correlation and the relative contribution of seed and seedling parameters were done through Principal Component Analysis using the “R” software program.

  Progressive Agriculture 28 (4): 316-322, 2017
  
Funding Source:
1.   Budget:  
  

The medium-sized seed produced the highest germination percentage in all three species of Sesbania, and the large seed produced the highest seedling length, vigour index and total biomass yield; although the numerical values did not differ statistically. The large-sized seed produced highest shoot & root length, base diameter, cotyledon length & width, leaf length and leaf width followed by medium and small-sized seed. There were significant differences on germination and seedling growth parameters among the Sesbania species. The significant, both positive and/or negative, correlations were observed among the variables studied. It may be concluded that medium to large- sized seed sown at relatively higher seed rate could be helpful for higher biomass production of Sesbania spp. especially at the early growth stages.

  Journal
  


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