Radiation Processed Carrageenan Improves Plant Growth, Physiological Activities, and Alkaloids Production in Catharanthus roseus L.

Table 4

Effect of six foliar concentrations of irradiated carrageenan (ICR) on activities of nitrate reductase, carbonic anhydrase, and tryptophan decarboxylase (TDC) of Catharanthus roseus L. at 120 and 150 DAP. Means within a column followed by the same letter(s) are not significantly different ().

Treatments (mg L^−1)	Nitrate reductase activity		Carbonic anhydrase activity		Tryptophan decarboxylase activity
	[nM g^−1 (FW) h^−1]		[mol (CO2) kg^−1 (FW) s^−1]		(nmol min^−1 mg^−1 protein)
	120 DAP	150 DAP	120 DAP	150 DAP	120 DAP	150 DAP
ICR 0	214.2^e	224.9^e	5.34^d	5.45^d	20.0^f	22.0^f
ICR 20	222.0^d	232.4^d	5.65^c	5.67^c	20.5^e	22.5^e
ICR 40	230.0^c	248.0^c	5.73^c	5.76^c	21.0^d	23.0^d
ICR 60	236.5^b	260.8^b	5.85^bc	5.90^bc	21.6^c	24.0^c
ICR 80	244.6^a	270.7^a	6.13^a	6.30^a	22.5^a	25.7^a
ICR 100	238.4^b	264.0^b	5.93^b	5.98^b	22.0^b	24.7^b
LSD at 5%	5.42	6.20	0.18	0.20	0.02	0.02