Allelopathic Effects on Seed Germination and Seedling Growth of Brassica pekinensi, Caused by Water Extracts of Branches and Leaves from Davidia involucrata and Bothrocaryum controversum

doi:10.7525/j.issn.1673-5102.2022.05.018

Abstract

Abstract:

In order to identify whether Davidia involucrata and its associated tree species Bothrocaryum controversum affect the seed germination and seedling growth of other plants through allelopathic effects to maintain their stable associated relationship， the branches and leaves of wild D. involucrata and B. controversum in Pingwu County were used as the material source of the water extract， and the seeds of Brassica pekinensi were explored the effects of water extracts of the branches or leaves of the two species or their mixture at five concentrations（0， 0.025， 0.050， 0.075， 0.100 g·mL^-1） on the seed germination and seedling growth of B. pekinensi respectively. The results showed：①Water extracts of branches of D. involucrata and Bothrocaryum controversum had little effect on the germination of Brassila pekinensi seeds， but seedlings growth was significantly promoted and increased with increasing concentration（P＜0.05）. ②The water extracts of D. involucrata and Bothrocaryum controversum had significant inhibitory effects on seed germination of Brassila pekinensi（P＜0.05）， but their effects on seedling growth were different. The former showed the phenomenon of “low promotion and high inhibition” with the increase of concentration， while the latter showed the characteristic of “inhibition increase”. ③The water extracts from different sources of branches-leaves mixtures had significant inhibitory effect on seed germination of Brassila pekinensi（P＜0.05）， and showed the characteristics of “low promotion and high inhibition” with the increase of concentration. The results demonstrated that the allelopathic effects of water extracts from branches and leaves of D. involucrata and Bothrocaryum controversum on seed germination and seedling growth of the same recipient plant were different， and different species， parts and concentrations could lead to different allelopathic intensity and direction. This phenomenon might be a long-term plant evolution and maintained the stable interspecific relationships.

Key words: Davidia involucrata, Bothrocaryum controversum, Brassica pekinensi, seed germination, seedling growth, allelopathic effects

CLC Number:

Q945.34

Huan WANG, Yunfei XU, Yibo LIU, Qinsong LIU, Wenjuan XU, Yun LONG, Xiao XU. Allelopathic Effects on Seed Germination and Seedling Growth of Brassica pekinensi, Caused by Water Extracts of Branches and Leaves from Davidia involucrata and Bothrocaryum controversum[J]. Bulletin of Botanical Research, 2022, 42(5): 866-875.

Figures/Tables 7

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来源 Source	质量浓度 Concentration /g·mL^-1	发芽率 Germination percentage /%	发芽指数 Germination index	发芽速度指数 Germination speed index
珙桐枝 Branches of D. involucrata	0（CK）	96.00±0.01ab	65.53±1.40a	731.40±12.24a
	0.025	93.00±0.01c	64.00±1.62a	714.20±14.45a
	0.050	94.00±0.01bc	64.33±1.39a	721.00±12.59a
	0.075	97.00±0.01a	64.47±1.12a	730.40±11.53a
	0.100	97.33±0.01a	63.87±1.07a	729.60±10.42a
珙桐叶 Leaves of D. involucrata	0（CK）	96.00±0.01a	65.53±1.40a	731.40±12.24a
	0.025	96.33±0.01a	65.23±1.82a	731.90±16.44a
	0.050	95.00±0.01ab	50.86±1.19b	613.10±10.84b
	0.075	91.67±0.01b	32.07±0.80c	403.80±11.27c
	0.100	84.00±0.02c	22.29±0.80d	283.10±11.02d

来源 Source	质量浓度 Concentration /（g·mL^-1）	发芽率 Germination percentage /%	发芽指数 Germination index	发芽速度指数 Germination speed index
灯台树枝 B. controversum	0（CK）	96.00±0.01ab	65.53±1.40a	731.40±12.24a
	0.025	95.67±0.01ab	64.28±2.40a	722.20±18.15a
	0.050	94.00±0.02b	65.81±1.59a	730.10±15.81a
	0.075	98.00±0.01a	64.12±1.67a	722.10±15.29a
	0.100	93.00±0.01b	60.17±1.32a	683.50±13.95a
灯台树叶 B. controversum	0（CK）	0.96±0.01a	65.53±1.40a	731.40±12.24a
	0.025	79.67±0.02b	20.12±0.73b	255.40±9.28b
	0.050	6.00±0.01c	0.57±0.14c	6.20±1.76c
	0.075	0.67±0.00d	0.07±0.051c	0.70±0.59c
	0.100	0d	0c	0c

来源 Source	质量浓度 Concentration /g·mL^-1	发芽率 Germination percentage/%	发芽指数 Germination index	发芽速度指数 Germination speed index
枝+叶（珙桐） Branch & Leaf（D. involucrata）	0（CK）	99.00±0.01a	60.99±1.10a	713.40±8.42a
	0.025	93.33±0.01b	46.50±1.04b	579.90±12.18b
	0.050	88.67±0.01b	42.02±0.96c	539.80±11.54b
	0.075	81.33±0.02c	36.42±1.10d	478.30±13.86c
	0.100	72.00±0.02d	27.55±1.67e	364.20±12.14d
枝+叶（灯台树） Branch & Leaf（B. controversum）	0（CK）	99.00±0.01a	60.99±1.10a	713.40±8.42a
	0.025	94.67±0.01a	46.14±0.90b	586.60±10.31b
	0.050	82.00±0.01b	25.97±0.83c	344.50±11.40c
	0.075	28.00±0.03c	6.72±1.06d	87.60±14.24d
	0.100	7.00±0.02d	1.17±0.44e	14.30±5.74e
枝+叶（珙桐+灯台树） Branch & Leaf （D. involucrata+B. controversum）	0（CK）	99.00±0.01a	60.99±1.10a	713.40±8.42a
	0.025	98.00±0.01a	56.55±1.21b	678.20±10.62a
	0.050	85.00±0.01b	35.82±1.07c	473.50±14.32b
	0.075	49.67±0.02c	16.07±0.91d	215.50±12.52c
	0.100	29.33±0.04d	8.51±1.10e	112.80±16.02d

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