生物安全学报（中英文）2025，Vol.34Issue(4)：353-360,8.DOI:10.3969/j.issn.2095-1787.20240054
桐花树幼苗对模拟海水盐度与淹水时间的适应性
Acclimatization of Aegiceras corniculatum (L.) Blanco seedlings to simulated flooding time and salinity
摘要
Abstract
[Aim]This study aims to investigate the variations in growth and physiological indices of Aegiceras corniculatum seed-lings under different salinity and immersion time gradients.The objective is to explore the salt tolerance,immersion tolerance,and the interactive effects of salinity and immersion on seedling development.[Method]This study,based on simulated experiments with mangroves,utilized an automated control system in a greenhouse to simulate semi-diurnal tidal flooding.This study investigated the effects of varying salinities and flooding durations on the growth of A.corniculatum seedlings,with the aim of providing scientific guidance for mangrove restoration and achieving significant practical outcomes.The experiment included ten artificial seawater salini-ty(CK(0‰),S1(5‰),S2(10‰),S3(15‰),S4(20‰),S5(25‰),S6(30‰),S7(35‰),S8(40‰),and S9(45‰))and five flooding durations[T1(4 h·d-1),T2(8 h·d-1),T3(12 h·d-1),T4(16 h·d-1),and T5(20 h·d-1)]gradients.Physiological and biochemical indicators,such as seedling height,basal diameter,net photosynthetic rate,cata-lase(CAT)and superoxide dismutase(SOD)activities,and malondialdehyde(MDA)content,were measured and analyzed.[Re-sult]The findings indicate:(1)Seedlings of A.corniculatum grow best in salinity environments of 10‰-20‰,with complete mor-tality occurring at salinities of 40‰ and above;(2)Optimal growth occurs with flooding durations of 4-12 h·d-1,with durations exceeding 12 h·d-1 causing significant growth inhibition;and(3)The best growth is observed under a combination of 15‰salinity and 12 h·d-1 of flooding.[Conclusion]The increase in basal diameter and height,as well as the net photosynthetic rate of paulow-nia seedlings,initially rises and then decreases with increasing salinity.With prolonged flooding,these parameters initially increased and then decreased.CAT and SOD activities,and MDA content in A.corniculatum seedlings initially decreased and then increased with extended flooding.Similarly,these parameters first decreased and then increased with higher salinity.The optimal conditions for the growth of A.corniculatum seedlings were 12 h of flooding per day and 15‰salinity.These results provide scientific guidance for mangrove restoration.关键词
红树植物/桐花树/模拟潮汐/幼苗Key words
mangrove plants/Aegiceras corniculatum/simulate tides/seedling引用本文复制引用
王豪,吕晓波,方发之,曾润娟,张孟文..桐花树幼苗对模拟海水盐度与淹水时间的适应性[J].生物安全学报（中英文）,2025,34(4):353-360,8.基金项目
海南省重大科技计划项目(ZDKJ202008) （ZDKJ202008）
