Abstract
To screen the resistance towards alkalinity and acidity, the seeds of Azadirachta indica collected from six seed sources, comprising six agro-climatic zones of Tamil Nadu were utilized. The seeds were sown between paper towel medium. The solutions of pH ranging from 1 to 12 were employed as treatments to dip the paper towels sown with seeds from different seed sources. Water served as control. The result of the experiment proved that Azadirachta indica has the tolerance to certain level of acidity (up to pH 4) and alkalinity (up to pH 8). The species is not capable of germinating in a pH lesser than 4 or more than 8. Among the seed sources, significant variation has been exhibited. The seeds collected from Southern zone seed source exhibited good potential to tolerate a pH ranging from 4 to 8. Seeds collected from Cauvery-delta zone seed source were found to be more susceptible to extremes of pH.
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