不同鲜重秋茄胚轴形态及其对幼苗生长的影响

doi:10.11978/2021127

Abstract

Abstract:

In order to explore the phenotypic traits and nutrient contents of different fresh weights of Kandelia obovata hypocotyls and their effects on the growth of seedlings, and to determine the quality standard of hypocotyls in Zhejiang Province and improve the quality of forestation, we collected 6 groups of hypocotyls with different fresh weights (4.0~5.0g, 5.0~6.0g, 6.0~7.0g, 7.0~8.0g, 8.0~9.0g, 9.0~10.0g) to determine their phenotypic traits, nutrient contents and growth characteristics of seedlings. The results showed that the hypocotyl length, transverse diameter, and apical diameter increased significantly with the increase of fresh weight of hypocotyls. The percentage content of nitrogen (N), phosphorus (P), potassium (K), and organic carbon in the hypocotyl were not significantly different among the hypocotyls of different fresh weight, but with the increase of fresh weight of hypocotyls, the percentage content of starch decreased significantly. The total nutrient content in a single hypocotyl increased significantly with the increase of fresh weight of hypocotyls. The values of C:N, N:P and C:P of hypocotyl in fresh weight grade 7.0~8.0 were significantly higher than those in other fresh weight grades. The growth height, basal diameter, leaf number and biomass of seedlings increased significantly with the increase of fresh weight of hypocotyls, but between 5.0~6.0, 6.0~7.0 and 7.0~8.0, the stem biomass, leaf biomass, net biomass and the total biomass of seedlings are not significant. The correlation between hypocotyl phenotypic traits and seedling growth indicators was significant (P < 0.05). Except that the correlation between total P content and growth height was not significant, there was a significant positive correlation between the total N, K, Na, organic carbon, starch content and the growth indicators of seedlings (P < 0.05). The results of principal component analysis and comprehensive evaluation showed that the hypocotyls with fresh weight above 7.0g were better than those of other fresh weights. The regression analysis R² of growth height, net biomass and hypocotyl fresh weight of K. obovata seedlings were 0.978 and 0.951, respectively, with P < 0.01. When the hypocotyl fresh weight was higher than 5.22g, the growth height of seedlings increased sharply. When the hypocotyl fresh weight was higher than 8.74g, the growth of net biomass of seedlings accelerated. The higher the fresh weight of the hypocotyls of K. obovata, the higher the nutrient content, the more conducive to the growth of seedlings. In the planting of K. obovata in Zhejiang Province, hypocotyls with fresh weight above 7.0g should be selected with priority.

Key words: Kandelia obovata, hypocotyl fresh weight, phenotypic trait, nutrient content, seedling growth

CLC Number:

Q945

LIU Shuangshuang, YANG Sheng, LIU Xing, CHEN Qiuxia, WANG Jinwang, GUO Jinmin, WANG Jiayu, WANG Wenqing, WU Weizhi, LIANG Licheng, ZHANG Xiaowei. Morphological characteristics of hypocotyls with different fresh weights of Kandelia obovata and their effects on the seedling growth[J].Journal of Tropical Oceanography, 2022, 41(6): 56-66.

Figures/Tables 9

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胚轴鲜重等级	鲜重/g	长度/cm	横径/mm	顶径/mm	干重/g
4.0~5.0g	4.46±0.04^a	13.94±0.12^a	8.69±0.09^a	4.69±0.03^a	1.66±0.03^a
5.0~6.0g	5.48±0.04^b	14.75±0.16^b	9.42±0.08^b	4.96±0.03^b	2.15±0.04^b
6.0~7.0g	6.48±0.04^c	15.13±0.14^b	10.37±0.07^c	5.14±0.03^c	2.53±0.03^c
7.0~8.0g	7.43±0.04^d	15.76±0.17^c	10.79±0.08^d	5.43±0.04^d	2.91±0.03^d
8.0~9.0g	8.47±0.04^e	16.69±0.18^d	11.31±0.09^e	5.49±0.06^d	3.37±0.05^e
9.0~10.0g	9.45±0.04^f	16.49±0.18^d	12.02±0.08^f	5.82±0.04^e	3.96±0.04^f

胚轴鲜重等级	N含量/%	P含量/%	K含量/%	Na含量/(mg·g^-1)	有机碳含量/%	淀粉含量/(mg·g^-1)
4.0~5.0g	0.79±0.02^c	0.08±0.00^d	0.70±0.66^c	5.65±0.01^d	42.86±0.44^ab	332.51±11.99^bc
5.0~6.0g	0.80±0.01^c	0.07±0.00^bc	0.66±0.64^b	5.93±0.02^e	47.53±0.77^bc	341.77±4.85^c
6.0~7.0g	0.77±0.00^bc	0.06±0.00^ab	0.65±0.63^ab	5.97±0.04^e	43.84±0.20^b	314.97±2.31^bc
7.0~8.0g	0.73±0.02^ab	0.05±0.00^a	0.62±0.59^a	5.51±0.07^c	51.58±3.69^c	310.23±5.71^b
8.0~9.0g	0.71±0.18^a	0.06±0.00^bc	0.67±0.63^b	4.93±0.06^a	46.94±1.34^bc	254.83±6.64^a
9.0~10.0g	0.77±0.01^c	0.07±0.01^cd	0.66±0.64^b	5.16±0.04^b	37.78±2.40^a	250.89±17.74^a

胚轴鲜重等级	N含量/mg	P含量/mg	K含量/mg	Na含量/mg	有机碳含量/mg	淀粉含量/mg
4.0~5.0g	13.10±0.35^a	1.26±0.02^a	11.69±0.30^a	9.38±0.02^a	711.37±7.33^a	549.71±14.09^a
5.0~6.0g	17.28±0.12^b	1.41±0.06^a	14.23±0.22^b	12.76±0.05^b	1021.81±16.47^b	730.87±8.60^b
6.0~7.0g	19.47±0.09^c	1.42±0.03^a	16.42±0.16^c	15.10±0.11^c	1109.25±5.10^b	793.27±4.61^b
7.0~8.0g	21.22±0.60^d	1.49±0.04^a	17.91±0.25^d	16.02±0.21^d	1500.85±107.42^c	900.89±10.69^c
8.0~9.0g	24.04±0.60^e	2.15±0.11^b	22.48±0.52^e	16.61±0.20^e	1581.97±45.05^c	866.52±20.93^c
9.0~10.0g	30.66±0.30^f	2.83±0.27^c	26.25±0.40^f	20.45±0.16^f	1495.92±94.85^c	1000.86±47.96^d

胚轴鲜重等级	C:N	N:P	C:P	K:Na
4.0~5.0g	54.42±1.10^ab	10.36±0.12^a	562.98±6.24^a	1.25±0.03^b
5.0~6.0g	59.13±0.90^b	12.40±0.59^bc	735.32±44.83^b	1.12±0.02^a
6.0~7.0g	56.97±0.28^b	13.70±0.31^cd	780.43±18.54^b	1.09±0.01^a
7.0~8.0g	70.30±3.17^c	14.35±0.76^d	1019.51±97.27^c	1.12±0.05^a
8.0~9.0g	66.10±2.95^c	11.26±0.30^ab	746.91±48.64^b	1.36±0.01^c
9.0~10.0g	48.78±3.02^a	11.31±1.00^ab	550.05±57.24^a	1.28±0.02^b

胚轴鲜重等级	生长高/cm	基径/mm	叶片数/ (片·株^-1)	根干重/g	茎干重/g	叶干重/g	胚轴干重/g	净生物量/g	总生物量/g
4.0~5.0g	11.08±0.29^a	5.88±0.13^a	7.23±0.19^a	0.87±0.11^a	0.86±0.13^a	1.41±0.16^a	1.84±0.08^a	3.14±0.36^a	4.98±0.42^a
5.0~6.0g	14.53±0.33^b	6.52±0.12^b	8.10±0.23^b	1.37±0.12^bc	1.24±0.09^b	2.13±0.10^b	2.61±0.08^b	4.74±0.23^b	7.35±0.30^b
6.0~7.0g	16.50±0.37^c	7.18±0.11^c	8.18±0.17^b	0.77±0.14^a	1.19±0.09^ab	2.09±0.21^b	2.53±0.09^b	4.05±0.41^ab	6.58±0.50^b
7.0~8.0g	16.90±0.38^c	7.69±0.10^d	8.83±0.20^b	1.04±0.15^ab	1.27±0.15^b	2.19±0.14^b	2.98±0.06^c	4.50±0.37^b	7.48±0.42^b
8.0~9.0g	17.23±0.32^cd	8.04±0.09^e	10.23±0.43^c	1.55±0.12^cd	1.83±0.12^c	3.06±0.15^c	3.58±0.10^d	6.44±0.31^c	10.02±0.37^c
9.0~10.0g	18.18±0.42^d	8.51±0.11^f	12.28±0.42^d	1.85±0.18^d	2.23±0.14^d	3.57±0.20^d	4.18±0.13^e	7.64±0.41^d	11.82±0.44^d

Morphological characteristics of hypocotyls with different fresh weights of Kandelia obovata and their effects on the seedling growth

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	鲜重	长度	横径	顶径	N	P	K	Na	有机碳	淀粉	C:N	N:P	C:P	K:Na	生长高	基径	净生物量	总生物量
鲜重	1	0.972^**	0.994^**	0.990^**	0.976^**	0.890^*	0.985^**	0.970^**	0.928^**	0.947^**	0.039	0.066	0.062	0.443	0.913^*	0.994^**	0.908^*	0.935^**
长度		1	0.960^**	0.946^**	0.909^*	0.814^*	0.942^**	0.911^*	0.968^**	0.909^*	0.221	0.090	0.172	0.473	0.908^*	0.970^**	0.877^*	0.903^*
横径			1	0.989^**	0.970^**	0.856^*	0.970^**	0.983^**	0.924^**	0.962^**	0.042	0.152	0.110	0.359	0.944^**	0.998^**	0.874^*	0.904^*
顶径				1	0.977^**	0.868^*	0.967^**	0.983^**	0.926^**	0.975^**	0.041	0.147	0.115	0.347	0.923^**	0.991^**	0.887^*	0.918^**
N					1	0.939^**	0.986^**	0.980^**	0.844^*	0.938^**	-0.152	0.011	-0.078	0.401	0.882^*	0.960^**	0.942^**	0.960^**
P						1	0.953^**	0.855^*	0.687	0.767	-0.347	-0.331	-0.382	0.632	0.683	0.837^*	0.965^**	0.961^**
K							1	0.953^**	0.862^*	0.902^*	-0.105	-0.079	-0.105	0.526	0.858^*	0.962^**	0.954^**	0.969^**
Na								1	0.878^*	0.980^**	-0.052	0.203	0.085	0.245	0.951^**	0.977^**	0.877^*	0.906^*
有机碳									1	0.924^**	0.401	0.279	0.392	0.318	0.914^*	0.947^**	0.773	0.812^*
淀粉										1	0.114	0.340	0.263	0.144	0.968^**	0.968^**	0.822^*	0.859^*
C:N											1	0.529	0.877^*	-0.142	0.182	0.102	-0.187	-0.145
N:P												1	0.867^*	-0.792	0.421	0.177	-0.223	-0.164
C:P													1	-0.527	0.331	0.160	-0.237	-0.177
K:Na														1	0.086	0.353	0.569	0.540
生长高															1	0.947^**	0.763	0.801
基径																1	0.866^*	0.899^*
净生物量																	1	0.997^**
总生物量																		1

指标类型	项目	性状	主成分1	主成分2	主成分3
胚轴形态指标	X₁	长度	0.952	0.185	0.214
	X₂	横径	0.972	0.176	-0.038
	X₃	顶径	0.976	0.168	-0.042
	X₄	干重	0.994	0.061	-0.014
胚轴营养成分指标	X₅	N	0.989	-0.008	-0.138
	X₆	P	0.936	-0.341	-0.053
	X₇	K	0.994	-0.057	0.001
	X₈	Na	0.963	0.174	-0.196
	X₉	有机碳	0.888	0.392	0.239
	X₁₀	淀粉	0.930	0.333	-0.140
	X₁₁	C:N	-0.054	0.758	0.644
	X₁₂	N:P	-0.021	0.951	-0.306
	X₁₃	C:P	-0.043	0.974	0.201
	X₁₄	K:Na	0.473	-0.625	0.585
幼苗生长指标	X₁₅	生长高	0.884	0.418	-0.131
	X₁₆	基径	0.968	0.215	0.005
	X₁₇	叶片数	0.975	-0.192	-0.065
	X₁₈	根干重	0.823	-0.373	0.108
	X₁₉	茎干重	0.977	-0.200	-0.015
	X₂₀	叶干重	0.985	-0.128	-0.008
	X₂₁	胚轴干重	0.996	-0.023	0.011
	X₂₂	净生物量	0.963	-0.214	0.020
	X₂₃	总生物量	0.979	-0.151	0.017
初始特征值			17.592	3.852	1.110
方差贡献率/%			76.485	16.746	4.827
累积方差贡献率/%			76.485	93.231	98.059

胚轴鲜重等级	F₁	排序	F₂	排序	F₃	排序	F	排序
4.0~5.0g	-6.26	6	1.63	2	-0.59	5	-4.54	6
5.0~6.0g	-2.22	5	-0.43	4	-0.25	3	-1.78	5
6.0~7.0g	-0.73	4	-2.55	6	-0.35	4	-1.00	4
7.0~8.0g	0.75	3	-1.69	5	1.42	1	0.36	3
8.0~9.0g	2.34	2	2.63	1	1.11	2	2.28	2
9.0~10.0g	6.11	1	0.41	3	-1.33	6	4.68	1