Table 2.

Endogenous levels of indole-3-acetic acid (IAA) and abscisic acid (ABA) in shoots and roots of 30 day old in vitro grown potato plants, and their ratio to the endogenous level of cytokinin nucleobases in respective tissues.

Plant hormone	Shoots	Roots
IAA (pmol/gFW)	82.0 ± 19.0	62.3 ± 11.9
IAA/CK nucleobase ratio	9.6 ± 2.2	13.0 ± 2.5*
ABA (pmol/gFW)	251.9 ± 14.9*	124.3 ± 7.8
ABA/CK nucleobase ratio	29.6 ± 1.8	25.9 ± 1.6

Asterisks (*) are used to indicate the greater of the two values, where differences between shoot and root are statistically significant (P < 0.05 according to Student’s t-test).