Effect of drying treatments on the germination and imbibitional leakages of Salvadora oleiodes seeds
1999
Nisar, S. | Ashraf, M. (Islamia Univ., Bahawalpur (Pakistan). Dept. of Chemistry)
Immature and developing seeds of Salvadora oleiodes (locally called Pelun) were collected in May/June and graded into small (S) and large (L) and either dried under the sun (sun-dried) or in the laboratory (shade-dried) upto 8 plus minus 2 percent moisture content. When electrical conductance (E.C.) of leachates measured was taken as an index of membrane damage, leachates of seeds with testa ('intact') exhibited lower E.C. values after 6 hours of imbibition than that of without testa ('naked'). Shade-dried (S) 'naked' seeds had lower E.C. values (30.9 Mew S/cm/seed) than their 'intact' counterparts (61.84 Mew S/cm/seed). When nature of molecules effluxed during the first 30 minutes of imbibition was determined, K ions were dominant inorganic species than Na ions, and with higher rates of leakage in sun-dried 'intact' seeds (12-77 ppm/seed) than the shade-dried (22-54 ppm/seed) ones. Na ions levels remained constant (14-15 ppm/seed) in shade-dried 'intact' seeds than the sun-dried ones (5-18.5 ppm/seed). When amino acids and total sugar contents were determined in 'naked' seeds, sun-dried seeds exhibited higher amino acids leached (5-15.8, Mew moles/seed) than the shade-dried ones; 7-9.5 Mew moles/seed in 'L' and 10-16.8 Mew moles/seed in 'S' seeds. Soluble sugar contents in seeds of both the treatments varied in the range 18.75-33.7 Mew g/seed and were statistically insignificant to draw any conclusions between the two drying methods. It was also seen that the nature of the molecules effluxed was not correlated with the germination behavior of seeds since only shade-dried ('S' and 'L') seeds showed 100 percent germination whilst sun-dried ('L') had 40 percent germination and immature as well as sun-dried ('S') seeds did not germinate at all.
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