Enhancing Salt Stress Tolerance in Portulaca oleracea L. Using Ascophyllum nodosum Biostimulant  

作　　者：Zahra Alhawsa Rewaa Jalal Nouf Asiri 

机构地区：[1]Department of Biological Sciences,College of Science,University of Jeddah,Jeddah,21493,Saudi Arabia

出　　处：《Phyton-International Journal of Experimental Botany》2025年第4期1319-1337,共19页国际实验植物学杂志(英文)

摘　　要：Salinity stress is amajor constraint on agricultural productivity,particularly in arid and semi-arid regions.This study evaluated the potential of Ascophyllum nodosum extract(ANE)in mitigating salinity-induced stress and enhancing the growth and physiological performance of Portulaca oleracea L.under NaCl concentrations of 0,50,70,and 100 mM for 50 days.A two-way ANOVA assessed the effects of NaCl concentration,ANE treatment,and their interaction.The results showed that ANE significantly increased plant height at 50 mMNaCl(p=0.0011)but had no effect at higher salinity levels(p>0.05).Shoot dry weight was significantly influenced by the interaction of NaCl and ANE(p=0.0064),with ANE increasing biomass at 0 mM but decreasing it at 100 mM NaCl.However,ANE did not significantly affect root dry weight(p>0.05).Physiological responses indicated a significant increase in proline content at 50mMNaCl(p=0.0011),supporting improved osmotic adjustment.Total soluble protein was significantly enhanced at all salinity levels except 100 mM NaCl(p<0.01).Regarding ionic regulation,ANE had no significant effect on leaf sap pH(p>0.05)but increased electrical conductivity(EC)at 70 and 100 mM NaCl(p<0.01),suggesting a role in ion homeostasis under high salinity.Photosynthetic pigments responded positively to ANE,with significant increases in chlorophyll“a”(p<0.0001)and carotenoid content(p<0.0001),while chlorophyll“b”remained unchanged(p>0.05).These findings highlight ANE’s potential as a sustainable biostimulant for improving salinity tolerance,particularly at moderate NaCl levels.Future research should focus on molecular mechanisms and long-term field applications to optimize ANE’s role in enhancing soil and crop productivity under salinity stress.

关 键 词：Portulaca oleracea L. Ascophyllum nodosum extract(ANE) salinity stress physiological response biostimulant 

分 类 号：S565.9[农业科学—作物学]