Abstract
Summary Interspecific variation in various Mentha species, viz. Mentha arvensis , Mentha cardiaca , Mentha piperita , Mentha spicata and Mentha virdis for photosynthetic efficiency and 14 CO 2 incorporation into the primary metabolic pool and essential oil after 1 and 6 h of CO 2 incorporation have been investigated. There are significant differences among Mentha species in yield characteristics, viz. leaf area ratio, specific leaf weight, leaf weight ratio, and leaf stem ratio and in photosynthetic characteristics, viz. CO 2 exchange rate, stomatal conductance and chlorophyll content. In general, total 14C02 incorporation (ethanol soluble and insoluble fractions) increases from 1 to 6 h with maximum fixation in M. spicata . Most of the incorporation appeared in sugars, sugar phosphates and organic acids, and showed significant changes with time along with changes in 14 CO 2 incorporation in oil. These changes are accompanied by partitioning of 14 CO 2 labelled products into the stem. Oil content showed a significant negative association with 14 CO 2 incorporated in sugars after a 6 h feeding and positive but insignificant association with the photosynthetic rate.
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