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1.College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
2.State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
Received:25 January 2025,
Revised:2025-04-17,
Online First:27 April 2026,
Published:15 June 2026
王雪,姜黎,葛瑶等.耐盐植物促生菌,Enterobacter sp. Av16和,Acinetobacter sp. Av23减轻盐胁迫对白麻(,Apocynum pictum)种子萌发和幼苗光合作用的抑制[J].浙江大学学报(英文版)(B辑:生物医学和生物技术),2026,27(06):656-670.
Xue WANG, Li JIANG, Yao GE, et al. Halotolerant plant growth-promoting bacteria
王雪,姜黎,葛瑶等.耐盐植物促生菌,Enterobacter sp. Av16和,Acinetobacter sp. Av23减轻盐胁迫对白麻(,Apocynum pictum)种子萌发和幼苗光合作用的抑制[J].浙江大学学报(英文版)(B辑:生物医学和生物技术),2026,27(06):656-670. DOI: 10.1631/jzus.B2500049.
Xue WANG, Li JIANG, Yao GE, et al. Halotolerant plant growth-promoting bacteria
为提升药用、茶用和纤维
用盐生植物白麻(
Apocynum pictum
Schrenk)在盐碱地的栽培潜力,探究了耐盐植物促生菌(PGPB)对其种子萌发和幼苗生长的调控作用。研究结果表明,接种
Enterobacter
sp. Av16和
Acinetobacter
sp. Av23均可显著提高白麻种子的发芽率,并缓解盐胁迫对其幼苗生长的抑制作用。在盐胁迫下,PGPB可增加白麻的叶宽、叶长和叶面积,并提高叶片中光合色素(如叶绿素
a
+
b
和类胡萝卜素)的含量。更重要的是,PGPB分别通过稳定光系统和优化电子传递过程来减轻盐胁迫造成的光合机构损伤,主要表现在PGPB增加叶绿体反应中心密度(RC/CS
m
)以及提高电子向光系统I的转移效率(δ
R
o
和Φ
R
o
)。此外,在盐胁迫下,PGPB能改善叶绿素荧光特性和关键光合参数,如最大量子产率(Φ
P
o
)、光合性能指数(PI
abs
和PI
total
)、胞间CO
2
浓度、蒸腾速率和净光合速率(
P
n
)等;PGPB还可通过激活植物体内的抗氧化酶,如超氧化物歧化酶(SOD)和过氧化氢酶(CAT),来减少活性氧(ROS)在白麻幼苗中的积累,从而降低其受到的氧化胁迫。综上所述,PGPB可分别通过稳定光系统、提高气孔气体交换能力和减轻氧化损伤,增强白麻的种子萌发和光合能力。上述发现为利用PGPB提升白麻抗盐能力和盐碱地栽培适应性提供了重要理论依据。
Apocynum pictum
Schrenk
a halophyte
is commonly used as a traditional Chinese medicine
tea
and fiber crop. To improve the growth of
A
.
pictum
in saline soil
its responses to halotolerant plant growth-promoting ba
cteria (PGPB) were investigated at germination and during early growth stages. Inoculation with either
Enterobacter
sp. Av16 or
Acinetobacter
sp. Av23 significantly improved seed germination percentage and alleviated the adverse effects of salinity on seedling growth of
A
.
pictum
. Under salt stress
PGPB increased leaf area and improved photosynthetic pigments
including chlorophyll
a
+
b
and carotenoids
as well as intercellular carbon dioxide (
C
i
) and transpiration rate (
T
r
). More importantly
PGPB alleviated salt-induced damage to the photosynthetic apparatus by stabilizing the photosystems and optimizing electron transport processes. This was evidenced by increases in the density of reaction centers per cross-section (RC/CS
m
) and the efficiencies of electron transfer to photosystem I (δ
R
o
and Φ
R
o
). Consequently
PGPB improved chlorophyll fluorescence and key photosynthetic parameters
including the maximum quantum yield (Φ
P
o
)
performance index on absorption basis (PI
abs
)
overall performance index (PI
total
)
and net photosynthetic rate (
P
n
). Furthermore
PGPB activated antioxidant enzymes
such as superoxide dismutase (SOD) and catalase (CAT)
reducing the accumulation of reactive oxygen species (ROS) in
A
.
pictum
. In summary
PGPB enhanced
A
.
pictum
seed germination and photosynthetic capacity by stabilizing photosystems
improving stomatal gas exchange
and mitigating oxidative stress under salt stress. These findings highlight the potential of PGPB inoculation as a sustainable strategy to enhance salt resilience in
A
.
pictum
.
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