Some Primary Features of Salt Tolerance in Senna (Cassia acutifolia)

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Abstract
Studies on the germination of Cassia acutifolia (senna) seeds indicated, that they were highly tolerant of salinities up to 16.0 mmhos cm−1, and 50 per cent reduction in germination occurred, at about 20.0 mmhos cm.1. Air temperature had a significant effect on senna germination at substrate salinities between 10.0 and 25.0 mmhos cm−1. Seedling growth was more sensitive to salinity and alkalinity than the germination stage. Young plant survival and total pod yield were significantly reduced in soil salinities higher than 11.0 minhoa cm−1, and this was more pronounced when plants were irrigated at short intervals with saline waters. The sensitivity of senna to higher levels of salinities was correlated with the higher rate of chloride accumulation in the tissue resulting in specific chloride injury. However, the possibility of sodium injury cannot be excluded.

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