Fig. 4

Integrity and purity tests of mtDNA extracted from dry seeds of four other plant species. For integrity test ~28 µg of purified mtDNA was loaded on to the gel, showing in Template. For purity test 120 ng of mtDNA was used for each PCR reaction with specific mitochondria, chloroplast and nuclear primers (COX1, RBCL and actin, respectively). −VE indicates PCR with no template with the actin primers. +VE indicates unpurified mtDNA used as template with three different sets of primers. The purity based on three specific primer sets is also shown. To illustrate, black arrow is also used to show intact mtDNA; a green arrow, degraded mtDNA; white arrow heads, target products with +VE controls; white arrows, target product with COX1; red arrows, target product with RBCL and actin; blue arrows, target amplification from residual template with RBCL. Names of the plant species corresponding to each reaction are represented at the top, and DNA ladder in kb is represented on the left side of the gel