Coupling Effect of AM Fungi on the Root Morphology and Leaf Structure of Xanthoceras sorbifolium Bunge under Drought Stress

doi:10.13560/j.cnki.biotech.bull.1985.2024-0759

Abstract

Abstract:

Objective The study intends to investigate the effect of arbuscular mycorrhizal (AM) fungi on the root morphology, leaf physiology, and anatomical structure of Xanthoceras sorbifolium Bunge under drought stress, and to clarify the irrigation threshold. Method Funneliformes mosseae was used as the test strain, and one-year-old X. sorbifolium Bunge seedlings were selected for pot experiments. Four types of drought stress (well water supply (WW), light drought (LD), moderate drought (MD), and serious drought (SD)) were set up, with a total of eight treatments. All data were evaluated by conducting correlation and principal component analysis. Result AM fungi had a positive infection effect on X. sorbifolium Bunge, which enhanced root vitality, root volume, and the longest lateral root length, increased the accumulation of aboveground biomass higher than that of underground biomass. As the drought intensity intensified, the integrity of leaf anatomical structure was damaged after LD stress, but the damage to AM fungi-inoculated seedlings was less. Notably, mycorrhizal colonization markedly improved the accumulation of aboveground biomass than that of underground aboveground biomass. Moreover, AM fungi symbiosis led to a highly significant increase in the thickness of lower epidermis and palisade tissue (P<0.001), and the AM group were still high in comparison with the NM group under SD stress. In addition,the mycorrhization process led to a strong increase of the activities of superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) in comparison with NM plants under the same stress. Unlike, MDA content, and membrane damage reduced by AM symbiosis. Correlation analysis showed that the biomass of X. sorbifolium Bunge had a significant impact on various indicators of the root system. Furthermore, there was a significant positive correlation (P<0.05) between leaf thickness, upper epidermal thickness, and root vitality. On the other hand, the thickness of leaf sponge tissue was significantly positively correlated with root vitality and volume quantity (P<0.001). Principal component analysis showed that MD treatment was the critical point for the drought resistance of X. sorbifolium Bunge itself, and X. sorbifolium Bunge bacterial root seedlings had the best adaptability in LD drought environment. Conclusion AM fungi can contribute to better growth performance exposure to drought stress by enhancing root vitality, root volume, as well as improving the thickness of leaf palisade group, and leaf thickness. In general, X. sorbifolium Bunge can adapt to drought through activating antioxidant system of leaves, root traits, and synergistic strategies between root traits and leaves.

Key words: drought stress, AM fungi, Xanthoceras sorbifolium Bunge, root leaf coupling, physiological mechanism

ZONG Jian-wei, DENG Hai-fang, CAI Yuan-yuan, CHANG Ya-wen, ZHU Ya-qi, YANG Yu-hua. Coupling Effect of AM Fungi on the Root Morphology and Leaf Structure of Xanthoceras sorbifolium Bunge under Drought Stress[J]. Biotechnology Bulletin, 2025, 41(6): 167-178.

Figures/Tables 12

References 37

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处理 Treatment	田间持水量 Field water-holding capacity （%）
WW	75-80
LD	60-65
MD	45-50
SD	30-35

处理 Treatment	田间持水量 Field water-holding capacity （%）
WW	75-80
LD	60-65
MD	45-50
SD	30-35

处理 Treatment	地上部分鲜质量 Aboveground fresh weight （g）	地上部分干质量 Aboveground dry weight （g）	地下部分鲜质量 Underground fresh weight （g）	地下部分干质量 Underground dry weight （g）	根冠比 Root-shoot ratio
WW+NM	43.10±0.48b	37.95±0.86b	20.57±0.91b	17.98±2.07a	0.47±0.04cd
LD+NM	40.14±0.89c	28.09±1.02d	20.69±1.01b	16.18±0.36b	0.58±0.03b
MD+NM	20.40±1.56e	14.65±1.48f	11.29±0.58c	9.88±0.50c	0.68±0.07a
SD+NM	15.51±0.53f	13.32±0.99f	8.02±0.75d	7.60±0.72d	0.57±0.02b
WW+AM	45.46±0.05a	43.52±0.48a	23.69±1.29a	18.09±0.22ab	0.42±0.01d
LD+AM	42.56±0.28b	34.22±3.21c	21.10±1.08b	17.58±0.31a	0.52±0.04bc
MD+AM	22.86±0.93d	19.87±0.75e	11.86±0.52c	11.37±0.82c	0.57±0.03b
SD+AM	18.86±1.92e	15.71±0.62f	11.11±0.89c	8.37±0.27d	0.53±0.00bc
干旱 Drought	P<0.001	P<0.001	P<0.001	P<0.001	P<0.001
接种 Inoculation	P<0.001	P<0.001	P<0.001	P<0.05	P<0.001
干旱×接种 Drought×Inoculation	0.89	0.15	P<0.05	0.505	0.432

处理 Treatment	地上部分鲜质量 Aboveground fresh weight （g）	地上部分干质量 Aboveground dry weight （g）	地下部分鲜质量 Underground fresh weight （g）	地下部分干质量 Underground dry weight （g）	根冠比 Root-shoot ratio
WW+NM	43.10±0.48b	37.95±0.86b	20.57±0.91b	17.98±2.07a	0.47±0.04cd
LD+NM	40.14±0.89c	28.09±1.02d	20.69±1.01b	16.18±0.36b	0.58±0.03b
MD+NM	20.40±1.56e	14.65±1.48f	11.29±0.58c	9.88±0.50c	0.68±0.07a
SD+NM	15.51±0.53f	13.32±0.99f	8.02±0.75d	7.60±0.72d	0.57±0.02b
WW+AM	45.46±0.05a	43.52±0.48a	23.69±1.29a	18.09±0.22ab	0.42±0.01d
LD+AM	42.56±0.28b	34.22±3.21c	21.10±1.08b	17.58±0.31a	0.52±0.04bc
MD+AM	22.86±0.93d	19.87±0.75e	11.86±0.52c	11.37±0.82c	0.57±0.03b
SD+AM	18.86±1.92e	15.71±0.62f	11.11±0.89c	8.37±0.27d	0.53±0.00bc
干旱 Drought	P<0.001	P<0.001	P<0.001	P<0.001	P<0.001
接种 Inoculation	P<0.001	P<0.001	P<0.001	P<0.05	P<0.001
干旱×接种 Drought×Inoculation	0.89	0.15	P<0.05	0.505	0.432

处理 Treatment	根系活力 Root activity （μTTF /g/h）	根系体积 Root volume （cm³）	一级新根数 Number of new roots	最长侧根长 Roots length （cm）
WW+NM	70.40±2.27b	64.02±0.42c	101.33±0.58c	14.26±0.25b
LD+NM	63.90±1.26c	60.87±0.52d	91.33±1.53d	13.31±0.32c
MD+NM	42.16±1.10e	57.04±0.87f	81.67±0.58e	12.21±0.15d
SD+NM	32.61±1.46f	52.97±0.97g	70.33±1.53f	10.34±0.54e
WW+AM	78.50±0.57a	70.28±1.05a	122.67±2.52a	15.45±0.14a
LD+AM	73.41±2.27b	65.88±0.65b	106.00±1.00b	14.53±0.50b
MD+AM	51.04±2.30d	60.82±0.45d	92.67±0.58d	13.52±0.47c
SD+AM	49.61±4.09d	58.48±0.87e	80.33±1.53e	11.77±0.48d
干旱 Drought	P<0.001	P<0.001	P<0.001	P<0.001
接种 Inoculation	P<0.001	P<0.001	P<0.001	P<0.001
干旱×接种 Drought×Inoculation	P<0.01	2.81	P<0.001	0.12