Physiological Response and Drought Resistance Evaluation of Endophytic Bacteria to Sugarcane Under Drought Stress

doi:10.13560/j.cnki.biotech.bull.1985.2023-0818

Abstract

Abstract:

This work aims to explore the physiological response of inoculated endophytic bacteria to sugarcane under drought stress and the effect of alleviating drought-tolerant, and to provide research basis for the development and utilization of sugarcane drought-tolerant functional strains and the promotion of drought resistance cultivation techniques in sugarcane. Four sugarcane endophytes with strong in vitro drought tolerance were selected as the target strains. Two soil water contents were set up in pot experiment, namely normal watering（CK: soil water content 25%-30%）and moderate drought stress（soil water content 10%-12.5%）, and a total of 8 treatments were inoculated with single endophyte, combined endophyte and no endophyte, respectively. Physiological and biochemical indexes of sugarcane seedling stage were determined, and drought resistance of each treatment was evaluated comprehensively. Compared with CK, drought stress promoted the accumulation of proline（Pro）, soluble protein（SP）, soluble sugar（SS）and malondialdehyde（MDA）in sugarcane plants. The activity of superoxide dismutase（SOD）and peroxidase（POD）increased. The contents of leaf relative water content（RWC）, water loss rate in vitro（RWL）and chlorophyll（ChI）decreased. Compared with the treatment without inoculation, the inoculation of endophytic bacteria effectively alleviated drought stress under drought stress, among which ZM strain inoculated alone（ZD）had the highest comprehensive evaluation value of drought resistance D, and the gray correlation analysis showed that SOD, ChI, RWC and Pro were closely related to the D values of each treatment. ZM strain inoculation has the best effect on alleviating drought stress of sugarcane seedling, and can improve the drought resistance of sugarcane seedling by increasing the contents of ChI, RWC, Pro and SOD activity.

Key words: sugarcane, inoculate endophytic bacteria, drought resistance, physiological response, comprehensive evaluation

LUO Yan-ju, XIE Lin-yan, ZOU Qing-lin, LI Si-jie, LIU Han, LIU Lu-feng, HE Li-lian, LI Fu-sheng. Physiological Response and Drought Resistance Evaluation of Endophytic Bacteria to Sugarcane Under Drought Stress[J]. Biotechnology Bulletin, 2023, 39(12): 219-228.

Figures/Tables 10

References 28

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处理 Treatment	胁迫后叶绿素总含量Total chlorophyll content after stress	复水后叶绿素总含量 Total chlorophyll content after rehydration	胁迫后叶绿素a/b Chlorophyll a/b after stress	复水后叶绿素a/b Chlorophyll a/b after rehydration
CK	2.164±0.154b	1.902±0.045bc	2.575±0.325b	3.938±0.183abc
WD	1.517±0.006d	1.575±0.117e	2.482±0.055b	3.032±1.377c
K5	1.946±0.218c	2.156±0.105a	2.5572±0.290b	4.691±0.656ab
ZD	2.385±0.090a	1.847±0.049cd	2.850±0.285ab	3.699±0.166bc
DD	2.156±0.148b	1.994±0.096b	3.057±0.300a	5.259±2.098a
YD	1.582±0.115d	2.264±0.159a	3.079±0.087a	4.837±1.789ab
TD	1.625±0.066d	1.723±0.136d	2.566±0.771b	3.174±0.452c
FD	1.586±0.098d	1.718±0.122d	2.724±0.404ab	3.970±0.281abc

处理 Treatment	胁迫后叶绿素总含量Total chlorophyll content after stress	复水后叶绿素总含量 Total chlorophyll content after rehydration	胁迫后叶绿素a/b Chlorophyll a/b after stress	复水后叶绿素a/b Chlorophyll a/b after rehydration
CK	2.164±0.154b	1.902±0.045bc	2.575±0.325b	3.938±0.183abc
WD	1.517±0.006d	1.575±0.117e	2.482±0.055b	3.032±1.377c
K5	1.946±0.218c	2.156±0.105a	2.5572±0.290b	4.691±0.656ab
ZD	2.385±0.090a	1.847±0.049cd	2.850±0.285ab	3.699±0.166bc
DD	2.156±0.148b	1.994±0.096b	3.057±0.300a	5.259±2.098a
YD	1.582±0.115d	2.264±0.159a	3.079±0.087a	4.837±1.789ab
TD	1.625±0.066d	1.723±0.136d	2.566±0.771b	3.174±0.452c
FD	1.586±0.098d	1.718±0.122d	2.724±0.404ab	3.970±0.281abc

处理 Treatment	RWC	RWL	MDA	Pro	SS	SP	POD	SOD	ChI
相对含水量RWC	1.000
离体失水率RWL	0.706	1.000
丙二醛MDA	-0.837*	-0.566	1.000
脯氨酸Pro	0.083	-0.306	-0.014	1.000
可溶性糖 SS	0.403	0.225	-0.317	0.003	1.000
可溶性蛋白SP	0.835*	0.796*	-0.721	0.091	-0.082	1.000
过氧化物酶POD	0.079	-0.438	-0.255	0.295	-0.387	0.090	1.000
超氧化物歧化酶SOD	0.655	0.224	-0.476	0.528	-0.238	0.739	0.475	1.000
叶绿素ChI	0.291	-0.317	-0.055	0.848*	0.157	0.102	0.394	0.653	1.000

处理 Treatment	RWC	RWL	MDA	Pro	SS	SP	POD	SOD	ChI
相对含水量RWC	1.000
离体失水率RWL	0.706	1.000
丙二醛MDA	-0.837*	-0.566	1.000
脯氨酸Pro	0.083	-0.306	-0.014	1.000
可溶性糖 SS	0.403	0.225	-0.317	0.003	1.000
可溶性蛋白SP	0.835*	0.796*	-0.721	0.091	-0.082	1.000
过氧化物酶POD	0.079	-0.438	-0.255	0.295	-0.387	0.090	1.000
超氧化物歧化酶SOD	0.655	0.224	-0.476	0.528	-0.238	0.739	0.475	1.000
叶绿素ChI	0.291	-0.317	-0.055	0.848*	0.157	0.102	0.394	0.653	1.000

生理指标 Physiological index	主成分1 Principal component 1	主成分2 Principal component 2	主成分3 Principal component 3
相对含水量RWC	0.248	-0.079	0.109
离体失水率RWL	0.165	-0.270	-0.041
丙二醛MDA	-0.218	0.087	0.005
脯氨酸Pro	0.076	0.293	0.245
可溶性糖SS	0.045	-0.124	0.635
可溶性蛋白SP	0.239	-0.075	-0.202
过氧化物酶POD	0.061	0.252	-0.299
超氧化物歧化酶SOD	0.215	0.175	-0.145
总叶绿ChI	0.104	0.297	0.302
特征值eigenvalue	3.816	2.658	1.391
贡献率Contribution rate/%	42.402	29.533	15.452
累积贡献率Cumulative contribution rate/%	42.402	71.935	87.388