Ecological stoichiometry of two common hemiparasite plants and their relationship with host trees in Ailao Mountain, Yunnan, China

doi:10.17521/cjpe.2018.0311

Abstract

Abstract:

Aims The objectives of this study were to characterize the carbon (C) : nitrogen (N) : phosphorus (P) stoichiometry of the “host branches-haustorias-parasitic branches-parasitic leaves” continuum and to better understand nutrient relationship between hemiparasite plants and their hosts.

Methods The study site is located in the Xujiaba area of Ailao Mountain, Yunnan Province. Two common hemiparasite plants Loranthus delavayi and Taxillus delavayi were selected, and the C, N and P concentrations of host branches, haustorias, parasitic branches and parasitic leaves were measured.

Important findings The results showed that, the tendency of C, N, P stoichiometry characteristics of host branches-haustorias-parasitic branches-parasitic leaves were species specific, and were not identical between the two hemiparasites. The host branches of the same parasitic plant have similar C, N, and P stoichiometry characteristics, and the host species have no significant effect on the stoichiometry of hemiparasites. There was a close coupling relationship between the C, N, P stoichiometry characteristics in the host branches, and the haustorias was weaker than the host branch, the parasitic branch was weaker than the haustorias, and there was no significant correlation between the N and P concentrations in the parasitic leaf. There was a significant negative correlation between the host branches and the parasitic leaves of C concentration. The C, N, P stoichiometry characteristics of the haustorias were more similar to the parasitic branches, and it had a very significant positive correlation with the host branches. As a key part of the host and parasitic plants, the haustorias had a significant correlation with the host branches, which reflected the importance of the host branch nutrients to the parasitic plants. The element stoichiometry and their relationship of the haustorias were more similar to those of the parasitic branches, which embodied that haustorias as a parasitic plant organ had physiological functions similar to those of the parasitic branches. These results provided important data for in-depth study of nutrient utilization strategies and ecological adaptability of hemiparasitic plants.

http://jtp.cnki.net/bilingual/detail/html/ZWSB201903007

Key words: hemiparasite, ecological stoichiometry, branch, haustoria, leaf

TANG Dan-Dan, WU Yi, LIU Wen-Yao, HU Tao, HUANG Jun-Biao, ZHANG Ting-Ting. Ecological stoichiometry of two common hemiparasite plants and their relationship with host trees in Ailao Mountain, Yunnan, China[J]. Chin J Plant Ecol, 2019, 43(3): 245-257.

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https://www.plant-ecology.com/EN/Y2019/V43/I3/245

Figures/Tables 6

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变量 Variable	椆树桑寄生 Loranthus delavayi				柳叶钝果寄生 Taxillus delavayi
变量 Variable	物种 Species	器官 Organ	物种×器官 Species × Organ	R²	物种 Species	器官 Organ	物种×器官 Species × Organ	R²
C	*	ns	ns	0.336	ns	***	ns	0.863
N	ns	***	ns	0.657	ns	***	ns	0.445
P	ns	***	ns	0.526	ns	***	ns	0.747
C:N	ns	***	ns	0.712	ns	***	ns	0.586
C:P	ns	***	ns	0.663	ns	***	ns	0.826
N:P	ns	ns	ns	0.211	ns	***	ns	0.730

变量 Variable	椆树桑寄生 Loranthus delavayi				柳叶钝果寄生 Taxillus delavayi
变量 Variable	物种 Species	器官 Organ	物种×器官 Species × Organ	R²	物种 Species	器官 Organ	物种×器官 Species × Organ	R²
C	*	ns	ns	0.336	ns	***	ns	0.863
N	ns	***	ns	0.657	ns	***	ns	0.445
P	ns	***	ns	0.526	ns	***	ns	0.747
C:N	ns	***	ns	0.712	ns	***	ns	0.586
C:P	ns	***	ns	0.663	ns	***	ns	0.826
N:P	ns	ns	ns	0.211	ns	***	ns	0.730

		平均值 Mean (mg·g^-1)						变异系数 Coefficient of variation (%)
		C	N	P	C:N	C:P	N:P	C	N	P	C:N	C:P	N:P
椆树桑寄生 Loranthus delavayi	寄主枝 Host branch	449.90^c	4.01^c	1.55^ab	113.55^a	345.09^ab	3.01^b	0.78	11.95	35.38	11.39	55.68	50.37
	吸器 Haustoria	474.80^b	9.15^b	1.18^b	52.23^b	410.69^a	7.89^a	2.04	8.22	13.11	9.31	14.80	14.89
	寄生枝 Parasitic branch	486.10^a	8.90^b	1.03^b	56.34^b	503.09^a	9.08^a	2.14	20.55	25.82	17.28	26.25	25.43
	寄生叶 Parasitic leaf	478.00^ab	15.65^a	2.90^a	31.85^c	220.41^b	7.20^ab	2.76	24.57	56.37	19.60	55.53	55.33
柳叶钝果寄生 Taxillus delavayi	寄主枝 Host branch	460.28^c	2.64^c	0.32^c	184.03^a	1 618.57^a	9.37^ab	1.60	24.17	39.11	24.54	29.85	35.49
	吸器 Haustoria	477.17^a	7.67^b	0.73^b	63.47^b	679.07^b	10.74^a	2.17	15.76	18.88	13.52	19.79	16.11
	寄生枝 Parasitic branch	483.50^a	7.65^b	0.94^b	64.18^b	564.00^b	8.77^b	1.39	12.87	33.30	12.19	28.24	25.40
	寄生叶 Parasitic leaf	431.61^c	10.10^a	3.16^a	45.82^c	158.13^c	3.76^c	2.98	27.51	37.24	26.87	44.33	58.43
总体 Total	寄主枝 Host branch	456.57^b	3.13^c	0.76^c	158.86^a	1 163.70^a	7.10^cbd	1.75	28.19	90.78	63.46	58.70	31.62
	吸器 Haustoria	476.32^a	8.20^b	0.89^b	59.46^b	583.22^b	9.72^a	2.10	15.59	29.32	15.45	29.58	21.25
	寄生枝 Parasitic branch	484.43^a	8.10^b	0.97^b	61.38^b	542.25^b	8.88^ab	1.68	17.91	30.38	15.00	27.77	24.99
	寄生叶 Parasitic leaf	448.18^bc	12.08^a	3.06^a	40.83^c	180.37^c	4.99^d	5.79	34.24	43.48	30.48	52.63	66.97

		平均值 Mean (mg·g^-1)						变异系数 Coefficient of variation (%)
		C	N	P	C:N	C:P	N:P	C	N	P	C:N	C:P	N:P
椆树桑寄生 Loranthus delavayi	寄主枝 Host branch	449.90^c	4.01^c	1.55^ab	113.55^a	345.09^ab	3.01^b	0.78	11.95	35.38	11.39	55.68	50.37
	吸器 Haustoria	474.80^b	9.15^b	1.18^b	52.23^b	410.69^a	7.89^a	2.04	8.22	13.11	9.31	14.80	14.89
	寄生枝 Parasitic branch	486.10^a	8.90^b	1.03^b	56.34^b	503.09^a	9.08^a	2.14	20.55	25.82	17.28	26.25	25.43
	寄生叶 Parasitic leaf	478.00^ab	15.65^a	2.90^a	31.85^c	220.41^b	7.20^ab	2.76	24.57	56.37	19.60	55.53	55.33
柳叶钝果寄生 Taxillus delavayi	寄主枝 Host branch	460.28^c	2.64^c	0.32^c	184.03^a	1 618.57^a	9.37^ab	1.60	24.17	39.11	24.54	29.85	35.49
	吸器 Haustoria	477.17^a	7.67^b	0.73^b	63.47^b	679.07^b	10.74^a	2.17	15.76	18.88	13.52	19.79	16.11
	寄生枝 Parasitic branch	483.50^a	7.65^b	0.94^b	64.18^b	564.00^b	8.77^b	1.39	12.87	33.30	12.19	28.24	25.40
	寄生叶 Parasitic leaf	431.61^c	10.10^a	3.16^a	45.82^c	158.13^c	3.76^c	2.98	27.51	37.24	26.87	44.33	58.43
总体 Total	寄主枝 Host branch	456.57^b	3.13^c	0.76^c	158.86^a	1 163.70^a	7.10^cbd	1.75	28.19	90.78	63.46	58.70	31.62
	吸器 Haustoria	476.32^a	8.20^b	0.89^b	59.46^b	583.22^b	9.72^a	2.10	15.59	29.32	15.45	29.58	21.25
	寄生枝 Parasitic branch	484.43^a	8.10^b	0.97^b	61.38^b	542.25^b	8.88^ab	1.68	17.91	30.38	15.00	27.77	24.99
	寄生叶 Parasitic leaf	448.18^bc	12.08^a	3.06^a	40.83^c	180.37^c	4.99^d	5.79	34.24	43.48	30.48	52.63	66.97

组成 Composition	寄主枝 Host branch	吸器 Haustoria	寄生枝 Parasitic branch	寄生叶 Parasitic leaf
C和N C and N	-0.496^**	0.080	0.221	0.595^**
C和P C and P	-0.588^**	-0.243	-0.126	-0.259
C和N:P C and N:P	0.477^*	0.462^*	0.242	0.621^**
N和P N and P	0.716^**	0.662^**	0.419^*	-0.257
N和C:P N and C:P	-0.619^**	-0.666^**	-0.388^*	0.285
P和C:N P and C:N	-0.599^**	-0.722^**	-0.402^*	0.196