Abstract
The response of BARI Sunflower-2 (Helianthus annuus L.) to sodium chloride (NaCl) at germination and early seedling growth was investigated. The seeds and seedlings of sunflower were treated with a series of eight different concentrations of NaCl viz 25, 50, 75, 100, 125, 150, 175 and 200 mM and distilled water (control) and were allowed to grow under plate culture condition. The results showed that the highest salinity concentration (200 mM NaCl) remarkably decreased the germination percentage, germination index and speed of germination of BARI Sunflower-2. Fresh and dry masses of both shoot and root were significantly reduced at a 25-200 mM NaCl solution. Significant reductions of shoot and root length were also noted with the increase of NaCl concentration. The results also illustrate that up to 50 mM NaCl concentration, all of the germination indices and fresh and dry biomass were withstand more than 70%. Thus the present study concluded that the BARI Sunflower-2 could be cultivated in moderately saline soil.Jahangirnagar University J. Biol. Sci. 7(1): 35-44, 2018 (June)
Highlights
Sunflower is the most important oil seed crop of the world next to groundnut, rapeseed and mustard (Talia et al, 2011)
The germination percentage, germination index and speed of germination was calculated by the following formula: Effects, sodium chloride, germination, seedling growth, Sunflower (Helianthus annuus L.) 37
This result was in similar with Francois et al (1986) noticed that in wheat germination was significantly delayed and the final germination percentage was markedly reduced by salinity
Summary
Sunflower is the most important oil seed crop of the world next to groundnut, rapeseed and mustard (Talia et al, 2011). After seven days of growth germination percentage, germination index, germination speed, shoot and root length, and fresh weight and dry weight of root and shoot were recorded. Seedling height and root lengths were recorded on the 7th day after the seeds were placed for germination. Germination Percentage (GP) and Germination index (GI): In the present study, the highest germination percentage was recorded 90% in the control and the lowest value was 53.33% in 200 mM NaCl (Table 1).
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