Influence of Mn Deficiency on Growth,Chlorophyll Content,Physiology, and Essential Monoterpene Oil(s) in Genotypes of Spearmint (Mentha Spicata L.)

At various intervals after inoculation of the roots of groundnut plants with the fungus Macrophomina phaseoli, ¹⁴CO₂ was administered to branch 2 (from the base) of the plants in the light. The effects of the disease on the translocation of ¹⁴C-photosynthates out of the source branch to the rest of the plant were studied 24 h after labelling. As the plant aged and the disease symptom development became more evident, an increasing percentage of the fixed ¹⁴C-photosynthates was exported from branch 2 of the inoculated plants (IP) compared to the non-inoculated plants (NIP). The apex, main stem, and branch 1 of NIP imported more of the total fixed ¹⁴C throughout the developmental stages of the plant except for day 10 after inoculation when branch 1 of IP imported almost 76 % of the total fixed ¹⁴C. The roots of IP were the major sink and imported higher percent of the total fixed ¹⁴C than the roots of NIP. This revised version was published online in August 2006 with corrections to the Cover Date.