抗坏血酸浸种对盐碱条件下海滨锦葵幼苗质量的影响  

Effect of ascorbic acid soaking seeds on the quality of Kosteletzkya pentacarpo seedlings under saline-alkali conditions

作　　者：周建 赵双龙 迭鹏翔 ZHOU Jian;ZHAO Shuanglong;DIE Pengxiang(School of Horticulture and Landscape Architecture,Henan Institute of Science and Technology,Xinxiang 453003,China;Henan Horticultural Plant Resource Utilization and Germplasm Innovation Engineering Research Center,Xinxiang 453003,China)

机构地区：[1]河南科技学院园艺园林学院,河南新乡453003 [2]河南省园艺植物资源利用与种质创新工程研究中心,河南新乡453003

出　　处：《河南科技学院学报（自然科学版）》2024年第3期44-53,共10页Journal of Henan Institute of Science and Technology(Natural Science Edition)

基　　金：河南省科技攻关计划项目(202102110053);新乡市科技攻关项目(GG2021007)。

摘　　要：为探索抗坏血酸对盐碱胁迫下海滨锦葵幼苗质量的影响,研究将海滨锦葵种子在25、50、100 mg/L抗坏血酸溶液中浸种12 h、24 h,并测定盐碱下海滨锦葵幼苗生长、组织Na+浓度、叶绿素浓度及叶绿素荧光等指标.试验结果表明:中低浓度VC处理促进盐碱条件下海滨锦葵的株高生长,但对地径和干质量调控效果不明显;抗坏血酸浸种增强海滨锦葵对钠离子富集能力,降低盐碱土钠离子浓度;中高浓度VC处理基本促进叶绿素a与类胡萝卜素含量,而大体降低含叶绿素b量;初始荧光F0上升,最大光化学效率Fv/Fm比较稳定,而实际光化学效率Φ_(PSⅡ)、光化学淬灭系数qP则明显下降.随机森林回归分析,植株地径、植物含钠离子量、Chla及Φ_(PSⅡ)受VC浸种的影响最大.经过综合比较,25 mg/L浸种24 h的处理效果最佳.To explore the effect of ascorbic acid on the quality of Kosteletzkya pentacarpos seedlings under saline-alkali stress,K.pentacarpos seeds were soaked in 25,50,100 mg/L ascorbic acid solution for 12 h and 24 h,and the growth,Na+concentration,chlorophyll concentration and chlorophyll fluorescence of K.pentacarpos seedlings under saline-alkali stress were measured.The results showed that medium and low concentrations of VC treatment promoted the plant height growth of K.pentacarpos under saline-alkali conditions,but had no obvious effect on the regulation of ground diameter and dry weight.Ascorbic acid soaking enhanced the ability of K.pentacarpos to enrich sodium ions and reduced the concentration of sodium ions in saline-alkali soil.The medium and high concentration of VC treatment basically promoted the content of chlorophyll a and carotenoids,but generally reduced the content of chlorophyll b;the initial fluorescence F0 increased,the maximum photochemical efficiency Fv/Fm was relatively stable,while the actual photochemical efficiency Φ_(PSⅡ) and photochemical quenching coefficient qP decreased significantly.Through random forest regression analysis,the indices such as plant diameter,plant sodium ion content,Chla,and Φ_(PSⅡ),were most affected by VC seed-soaking.After a comprehensive comparison,25 mg/L soaking for 24 h had the best alleviation effect on saline-alkali-stressed seedlings of K.pentacarpos.

关 键 词：抗坏血酸 海滨锦葵 盐碱胁迫 Na+富集 叶绿素荧光 

分 类 号：Q945.78[生物学—植物学]