Applications of Defense Elicitors to Roots of Containerized Eastern White Pine (Pinus strobus) Stimulate Increased Defensive Enzyme Activities of Fine Roots

Angelina Harley; Andrew L. Loyd; Shealyn C. Malone; Amy M. Trowbridge; Kelby Fite; Chad M. Rigsby

doi:10.48044/jauf.2024.024

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Table 1.

Mean (± 1 SE) peroxidase and chitinase enzyme activities quantified 3 (June 10), 7 (June 14), and 20 (June 27) days post-treatment. Letters indicate a significant effect of elicitor, and different letters indicate statistical differences via post-hoc Tukey tests. SE (standard error); POX (peroxidase); CHI (chitinase); Phi (phosphite); Si (silicone).

Activity	Elicitor	June 10	June 14	June 27
POX (mmols min^-1 mgr^-1)	Control	1.14 ± 0.17 ^B	0.72 ± 0.14 ^B	0.69 ±0.08
	Chitosan	2.27 ± 0.30 ^A	1.08 ± 0.23 ^AB	0.66 ± 0.07
	Curdlan	2.57 ± 0.32 ^A	1.77 ± 0.27 ^A	0.64 ± 0.07
	Phi	1.11 ± 0.17 ^B	1.88 ± 0.23 ^A	0.65 ± 0.07
	Si	2.02 ± 0.15 ^AB	1.36 ± 0.30 ^AB	0.88 ± 0.08
CHI (ΔAbs hr^-1 mg^-1)	Control	0.036 ± 0.004 ^B	0.033 ± 0.006 ^B	0.032 ± 0.006 ^B
	Chitosan	0.070 ± 0.005 ^A	0.051 ± 0.006 ^AB	0.054 ± 0.007 ^AB
	Curdlan	0.042 ± 0.005 ^B	0.072 ± 0.007 ^A	0.082 ± 0.018 ^A
	Phi	0.016 ± 0.004 ^C	0.052 ± 0.006 ^AB	0.086 ± 0.012 ^A
	Si	0.051 ± 0.006 ^AB	0.052 ± 0.007 ^AB	0.065 ± 0.010 ^AB