. 2019 May 25;25(4):881–894. doi: 10.1007/s12298-019-00674-4

Table 2.

Mean squares (MS) for photosynthetic pigments including chlorophyll a (Chl a), chlorophyll b (Chl b), carotenoids (Car), and secondary metabolites consisting of flavonoid, polyphenols, and anthocyanin of Dracocephalum moldavica

Sources of variance	Degree of freedom	MS
Sources of variance	Degree of freedom	Chl a	Chl b	Car	Flavonoid	Polyphenols	Anthocyanin
Melatonin	3	4.68^**	1.51^**	0.831^**	0.431^**	25.69^**	0.3^*
Drought stress	3	211.1^**	78.31^**	47.43^**	15.56^**	922.5^**	81.38^**
Melatonin × drought stress	9	0.696^ns	0.514^*	0.105^ns	0.079^ns	1.31^ns	0.084^ns
Error	48	0.624	0.215	0.101	0.092	1.15	0.078
CV%		5.1	8.2	9.6	13.2	5.3	6.3

**, * and ns denote significant differences at 0.01, 0.05% levels, and not significant respectively