Correlation and path analysis in Kalmegh (Andrographis paniculata Nees.)

Abstract

Correlation coefficient and Path coefficient analysis was studied in six lines viz., IIHR AP 25-4 (L1), IIHR AP 32-1 (L2), IC111295 (L3), IIHR AP 18-7 (L4), IIHR AP 30-8 (L5), IIHR AP 18-4 (L6) which were crossed with three testers viz., Anand Kalmegh-1 (T1), IIHR AP 27-2 (T2) and IC111291 (T3) and the 18 hybrids obtained through line x tester mating design. They were evaluated for the important quantitative traits related to herbage yield and andrographolide yield per plant. Correlation results revealed that leaf andrographolide yield per plant exhibited highly significant positive association with leaf area index and number of leaves per plant. Stem andrographolide yield per plant recorded highly positive significant association with stem dry weight and total dry weight per plant. Path analysis showed that leaf andrographolide yield and stem andrographolide yield per plant were directly contributing to total andrographolide yield per plant.