Effect of EBR on Seed Germination, Seedling Growth and Key Enzyme Activities for Flavonoid Biosynthesis in Astragalus membranaceus var. mongholicus Under PEG-induced Drought Stress
Pharmacy Fundamentals|更新时间:2021-07-28
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Effect of EBR on Seed Germination, Seedling Growth and Key Enzyme Activities for Flavonoid Biosynthesis in Astragalus membranaceus var. mongholicus Under PEG-induced Drought Stress
Chinese Journal of Experimental Traditional Medical FormulaeVol. 27, Issue 17, Pages: 139-145(2021)
LIANG Tai-shuai,ZHAO Xiao-qiong,GAO Jian-ping.Effect of EBR on Seed Germination, Seedling Growth and Key Enzyme Activities for Flavonoid Biosynthesis in Astragalus membranaceus var. mongholicus Under PEG-induced Drought Stress[J].Chinese Journal of Experimental Traditional Medical Formulae,2021,27(17):139-145.
LIANG Tai-shuai,ZHAO Xiao-qiong,GAO Jian-ping.Effect of EBR on Seed Germination, Seedling Growth and Key Enzyme Activities for Flavonoid Biosynthesis in Astragalus membranaceus var. mongholicus Under PEG-induced Drought Stress[J].Chinese Journal of Experimental Traditional Medical Formulae,2021,27(17):139-145. DOI: 10.13422/j.cnki.syfjx.20211114.
Effect of EBR on Seed Germination, Seedling Growth and Key Enzyme Activities for Flavonoid Biosynthesis in Astragalus membranaceus var. mongholicus Under PEG-induced Drought Stress
To study the effects of 24-epibrassinolide (EBR) at different concentrations on seed germination, seedling growth and key enzyme activities for flavonoid biosynthesis in
Astragalus membranaceus
var.
mongholicus
under polyethylene glycol (PEG)-induced drought stress, in order to provide theoretical reference for standardizing the drought-resistant cultivation techniques of
A. membranaceus
var.
mongholicus
.
Method
2
The seeds of
A. membranaceus
var.
mongholicus
were soaked in EBR solution at different concentrations(0.001, 0.01, 0.1, 1, 10 μmol·L
-1
) followed by foliar spraying to explore their effects on seed germination, seedling growth, photosynthesis, chlorophyll and malondialdehyde (MDA) contents, and key enzyme activities for flavonoid biosynthesis under drought stress induced by 20% polyethylene glycol (PEG)-6000.
Result
2
Compared with the control(CK)group, PEG-induced drought stress led to an obvious decrease in germination potential, germination rate, germination index, vigor index, relative germination rate, plant height, root length, aboveground and root dry weight, net photosynthetic rate (
Pn
), stomata conductance (
Gs
)
,
transpiration rate (
Tr
), chlorophyll contents and chlorophyll a/b ratio, while a significant increase in intercellular carbon dioxide concentration (
Gi
), MDA, flavonoids contents, and key enzyme activities for flavonoid biosynthesis such as phenylalanine ammonia lyase (PAL). The treatment with exogenous EBR solution at the suitable concentration significantly enhanced the adaptation of
A. membranaceus
var.
mongholicus
seeds and seedlings to PEG-induced drought stress, manifested as significantly elevated germination potential, germination rate, germination index, vigor index, relative germination rate, plant height, root length, aboveground and root dry weight,
Pn
,
Gs, Tr
, chlorophyll a/b ratio, chlorophyll and flavonoids contents and key enzyme activities for flavonoid biosynthesis like PAL while lowered
Ci
and MDA contents. The optimal concentration of EBR solution was 0.1 μmol·L
-1
.
Conclusion
2
Exogenous EBR solution at the suitable concentration ameliorates the inhibitory effect of 20% PEG stress against seed germination and seedling growth of
A. membranaceus
var.
mongholicus
, reduces the oxidative damage in leaves, and improves the stress resistance to a certain extent by up-regulating the key enzyme activities and promoting flavonoid synthesis.
LISTER C E , LANCASTER J E . Phenylalanine ammonia-lyase (PAL) activity and its relationship to anthocyanin and flavonoid levels in New Zealand-grown apple cultivars [J]. J Am Soc Horticulture Sci , 1996 , 12 ( 2 ): 281 - 285 .
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Research on Effect of Aqueous Extracts of Fallen Leaves of Castanea Mollissima on Seed Germination and Seedling Growth of Pinellia pedatisecta
Related Author
AI Qiang
JIANG Wei-ke
ZHOU Tao
XIAO Cheng-hong
XIONG Hou-xi
PAN Zhong-ping
CHEN Chuan-yi
LIAO Ming-wu
Related Institution
Qinling Chinese Herbal Medicine Application Development Engineering Technology Research Center,College of Pharmacy,Shaanxi University of Traditional Chinese Medicine
Chinese Medicine College,Beijing University of Chinese Medicine
Engineering Research Center of Good Agricultural Practice for Chinese Crude Drugs,Ministry of Education in China
Shijiazhuang Academy of Agriculture and Forestry Sciences