|Table of Contents|

Effects of Aluminum Stress on Seed Germination and Seedling Growth of Hibiscus sabdariffa

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2026年3
Page:
24-32
Research Field:
Publishing date:

Info

Title:
Effects of Aluminum Stress on Seed Germination and Seedling Growth of Hibiscus sabdariffa
Author(s):
WU Xianfeng12GUO Fangyue2CAO Yusong12LI Zhi′an3
(1.School of Life Science,Jinggangshan University,Ji′an,Jiangxi 343009;2.Jiangxi Province Poyang Lake Basin Ecological Technology Innovation Center,Jiangxi Academy of Water Sciences and Engineering,Nanchang,Jiangxi 330029;3.South China Botanical Garden,Chinese Academy of Sciences,Guangzhou,Guangdong 510650)
Keywords:
aluminum stressHibiscus sabdariffaseed germinationgrowth characteristicsphotosynthetic characteristics
PACS:
S567.219
DOI:
10.11937/bfyy.20252491
Abstract:
Taking roselle (Hibiscus sabdariffa L.) seeds as the experimental materials,this study investigated the effects of aluminum (Al) stress on seed germination,seedling growth,and photosynthetic characteristics through hydroponic germination and soil-based seedling culture experiments.Four AlCl3 treatment levels were established,200 mg·L-1 (T1),400 mg·L-1 (T2),800 mg·L-1 (T3),and 1 600 mg·L-1 (T4),all at pH 4.5.Germination dynamics,germination rate,seedling growth parameters,relative chlorophyll content (SPAD value),and chlorophyll fluorescence parameters under Al stress were analyzed,in order to provide reference for stress-resistant cultivation and utilization of marginal lands for roselle in southern red soil regions.The results showed that,1) Al stress significantly inhibited the seed germination process.Under T4 treatment,the germination potential (37.6%) and final germination rate (39.2%) decreased by 48.4% and 60.8%,respectively,compared to CK (P<0.05),and the germination peak was delayed until the 5th day.2) Seedling biomass accumulation was suppressed.The fresh weight under T4 treatment (0.776 g) was significantly reduced by 56.4% compared to CK (1.908 g).3) Root morphology exhibited sensitive responses,radicle length (5.50 mm) and diameter (1.17 mm) under T4 treatment decreased by 85.2% and 16.6%,respectively,compared to CK.However,an adaptive increase in root diameter (1.44 mm) was observed under T1 treatment.4) Regarding photosynthetic traits,the relative chlorophyll content (SPAD 42.3) under T4 treatment decreased significantly by 11.2%.The photochemical quenching coefficient (qP=0.727) and electron transport rate (ETR=185.7) decreased by 9.4% and 9.2%,respectively,compared to CK (P<0.05),whereas the maximum photochemical efficiency of PSⅡ (Fv/Fm>0.8) remained unaffected.In conclusion,Al stress significantly inhibits seed germination,seedling growth,and photosynthetic efficiency in roselle.High concentrations of Al (≥800 mg·L-1) markedly impede early growth and development by suppressing radicle elongation and reducing photosynthetic electron transport efficiency.The tolerance threshold for roselle was suggested to be approximately 400 mg·L-1.

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Last Update: 2026-02-24