接种土著和外源AM真菌对杜梨抗旱性的影响及其适应机制

doi:10.3864/j.issn.0578-1752.2024.01.011

Abstract

Abstract:

【Objective】Arbuscular mycorrhizal (AM) fungi play a significant role in enhancing plant growth and improving resistance to environmental stress. The aim of this study was to screen AM fungi that can withstand drought stress in pear seedlings, so as to establish a theoretical foundation and technical approach for pear mycorrhizal cultivation. 【Method】In this study, a pot experiment and high-throughput sequencing technology were employed to investigate the effects of single and mixed inoculation with indigenous AM fungi, including Claroideoglomus lamellosum (Cl), the exogenous fungus Funneliformis mosseae (Fm), Rhizophagus intraradices (Ri), and Acaulospora mellea (Am), on the growth of Pyrus betulaefolia seedlings under normal and drought conditions. The changes in the AM fungal community in the roots and rhizosphere soil of P. betulaefolia seedlings were analyzed under mixed inoculation (Mix) after 0, 3, and 6 weeks of drought treatment. 【Result】 Under normal and drought conditions, the single inoculation with Cl, Ri, and Mix significantly increased the plant height, stem diameter, leaf area, and relative water content of the leaves of pear seedlings, resulting in a dry weight increase of 35.26% to 52.20%. Additionally, the uptake of phosphorus, potassium, calcium, and magnesium in the aboveground part of the seedlings was enhanced, especially phosphorus uptake, with a mycorrhizal phosphorus uptake effect of up to 1.0. The exogenous fungus Am showed less effectiveness, while Fm inhibited the growth of P. betulaefolia seedlings under normal water supply conditions. Regression analysis indicated that the growth and element absorption effects of mycorrhizal fungi increased with the degree of infection. Under drought stress, AM fungal inoculation significantly reduced the MDA (malondialdehyde) content in the leaves of P. betulaefolia seedlings and increased the activity of antioxidant enzymes and the content of proline to varying degrees. Sequencing results demonstrated that the structure of the AM fungal community in the roots and rhizosphere soil of P. betulaefolia seedlings changed significantly under drought stress compared with normal water conditions. The exogenous fungus Ri dominated the community, followed by Cl and Am, while Fm was the least abundant. The abundance of Ri in the roots significantly increased with the degree of drought stress. 【Conclusion】In conclusion, the different AM fungi had varying effects on the growth of P. betulaefolia seedlings, with the indigenous strain Cl and the exogenous strain Ri showing strong growth-promoting effect and drought resistance. The increase in Ri abundance in the AM fungal community was an important adaptation mechanism for P. betulaefolia seedlings to withstand drought stress.

Key words: drought stress, Pyrus betulaefolia, arbuscular mycorrhizal fungi, growth-promoting, community structure

LI Han, JIANG ShangTao, PENG HaiYing, LI PeiGen, GU ChangYi, ZHANG JinLian, CHEN TingSu, XU YangChun, SHEN QiRong, DONG CaiXia. Effects of Inoculation with Indigenous and Exogenous Arbuscular Mycorrhizal Fungi on Drought Resistance of Pyrus betulaefolia and Its Adaptation Mechanism[J].Scientia Agricultura Sinica, 2024, 57(1): 159-172.

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References 43

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处理 Treatment		株高 Plant height (cm)	茎粗 Stem diameter (mm)	叶面积 Leaf area (cm²)	叶绿素含量 ChlorophyII content (mg∙g^-1)	干重 Dry weight (g)	叶片相对含水量 Relative water content of leaves (%)
正常 Normal	CK	8.01±1.70cd	2.75±0.26bc	126.36±4.21e	1.43±0.15bc	1.82±0.16bc	66.66±2.38bc
	Ri	20.02±3.46a	3.48±0.42a	240.21±25.10a	1.09±0.12d	2.58±0.40a	78.58±3.50a
	Fm	9.24±2.33cd	2.76±0.34bc	107.41±22.95fg	1.43±0.09bc	1.18±0.19d	80.50±7.13a
	Am	9.94±3.11cd	3.10±0.36ab	143.94±19.94d	1.36±0.09c	2.16±0.25b	76.62±5.46a
	Cl	14.48±4.24b	3.45±0.48a	230.22±6.19ab	1.40±0.07bc	2.72±0.28a	77.76±0.50a
	Mix	21.30±3.46a	3.38±0.48a	218.88±21.92b	1.28±0.04c	2.77±0.64a	78.24±7.41a
干旱 Drought	CK	6.75±1.68d	2.70±0.40bc	91.69±5.37g	1.64±0.03a	1.56±0.20c	58.09±1.02d
	Ri	14.02±2.43b	2.81±0.43bc	153.22±20.65d	1.38±0.07c	1.84±0.14bc	80.85±4.23a
	Fm	7.16±1.26cd	2.60±0.42c	103.15±17.95fg	1.43±0.08bc	1.60±0.29c	66.18±5.20c
	Am	6.75±1.70d	2.42±0.41c	72.05±8.55h	1.62±0.02a	1.59±0.32c	76.24±1.87a
	Cl	10.11±3.93c	2.85±0.23bc	121.16±2.85ef	1.55±0.07ab	2.11±0.31b	73.81±1.16ab
	Mix	14.73±3.76b	2.64±0.42c	175.72±9.66c	1.62±0.03a	2.12±0.26b	72.80±2.25abc

处理 Treatment		F (%)	M (%)	A (%)	菌丝密度 Hyphal density (cm∙g^-1)	孢子量 Spores number (g^-1 soil)
正常 Normal	Ri	100±0a	44.81±2.43b	28.71±3.22a	12.68±2.09c	11.06±1.57a
	Fm	80.56±17.35b	16.89±3.69e	6.42±1.25de	9.70±0.24c	1.53±0.12g
	Am	88.89±9.62ab	28.56±4.57d	8.93±0.34cd	12.41±2.22c	11.17±1.11a
	Cl	100±0a	18.93±1.58e	4.81±1.28ef	12.55±1.93c	9.53±0.40b
	Mix	100±0a	47.62±2.30b	16.12±1.05b	23.24±0.52b	6.33±1.29c
干旱 Drought	Ri	100±0a	54.28±1.89a	14.24±2.06b	21.10±3.36b	2.57±0.51fg
	Fm	100±0a	20.45±2.85e	5.76±1.57ef	21.24±1.37b	3.47±0.23ef
	Am	80.55±4.81b	26.97±2.03d	3.17±0.39f	16.98±1.51c	2.23±0.45fg
	Cl	100±0a	35.32±4.69c	16.70±2.15b	21.96±2.01b	4.33±0.23de
	Mix	100±0a	47.75±1.38b	10.41±0.52c	31.53±2.01a	5.60±1.40cd

		Ri		Fm		Am		Cl
		F值 F value	P值 P value	F值 F value	P值 P value	F值 F value	P值 P value	F值 F value	P值 P value
根系 Root	处理 Treatment	10.312	0.012*	1.173	0.310	1.197	0.306	7.633	0.025*
	时间 Time	4.728	0.061	1.230	0.300	2.361	0.163	5.201	0.052
	处理×时间 Treatment × Time	2.327	0.166	1.173	0.310	3.623	0.093	1.143	0.361
根际土 Rhizosphere soil	处理 Treatment	94.245	0.000***	0.333	0.580	3.045	0.119	20.335	0.002**
	时间 Time	6.768	0.032*	0.333	0.580	6.899	0.030*	286.066	0.237
	处理×时间 Treatment × Time	3.226	0.110	0.333	0.580	0.325	0.584	3.477	0.099

Effects of Inoculation with Indigenous and Exogenous Arbuscular Mycorrhizal Fungi on Drought Resistance of Pyrus betulaefolia and Its Adaptation Mechanism

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