Effects of heat shock on photosynthesis-related characteristics and lipid profile of Cycas multipinnata and C. panzhihuaensis

Table 1 The chlorophyll fluorescence following high shock (H) and recovery (R) in C. multipinnata and C. panzhihuaensis

	Fv/Fm	Y(II)	Y(NPQ)	Y(NO)	qp	qN	rETR
C. multipinnata
Control	0.819 ± 0.017a	0.460 ± 0.069a	0.292 ± 0.100a	0.248 ± 0.034b	0.792 ± 0.021a*	0.651 ± 0.151a	116.8 ± 17.570a
H	0.322 ± 0.037b	0.120 ± 0.019b*	0.180 ± 0.063b	0.700 ± 0.074a*	0.438 ± 0.054c*	0.473 ± 0.107b	30.400 ± 4.561b*
R	0.357 ± 0.030b*	0.147 ± 0.010b*	0.114 ± 0.017b	0.739 ± 0.018a*	0.547 ± 0.031b*	0.363 ± 0.035b*	36.200 ± 2.490b*
C. panzhihuaensis
Control	0.833 ± 0.003a	0.465 ± 0.050a	0.260 ± 0.046a	0.275 ± 0.016c	0.561 ± 0.050a	0.635 ± 0.048ab	117.4 ± 12.740a
H	0.339 ± 0.034b	0 ± 0b	0.178 ± 0.024b	0.822 ± 0.024b	0 ± 0b	0.583 ± 0.061b	0 ± 0b
R	0.160 ± 0.032c	0 ± 0b	0.085 ± 0.037c	0.915 ± 0.037a	0 ± 0b	0.791 ± 0.191a	0 ± 0b
Significance
Treatment	*	*	*	*	*	ns	*
Species	*	*	ns	*	*	*	*
Treatment × species	*	*	ns	*	*	*	*

Two-way ANOVA analysis was performed in the general linear model
rETR relative electron transport rate, Fv/Fm the maximum quantum yield of photosystem II (PSII); qN non-photochemical quenching coefficient, qP photochemical quenching coefficient, Y(II) effective quantum yield of PS II, Y(NO) non-regulated non-photochemical energy loss in PS II, Y(NPQ) regulated non-photochemical energy loss in PS II
^* indicates P ≤ 0.05 and ns indicates not significant. For the same species, different letters in the same column are significantly different between treatments according to One-way ANOVA at P ≤ 0.05. For the same treatment, * is significantly different between species according to independent samples T-test at P ≤ 0.05. Values shown are the mean ± SD, n = 5

ISSN: 1471-2229