CAJ | 학술논문

研究了Na＋等质量分数下中性盐（ NaCl和Na2 SO4）与碱性盐（ NaHCO3和Na2 CO3）对喜树幼苗生物量、体内离子选择性运输效应。结果表明：盐碱胁迫抑制了喜树根、茎生物量的积累；高浓度中性盐使叶生物量增加，高浓度碱性盐使叶生物量大幅降低；碱性盐对生物量的影响大于中性盐。盐碱胁迫使喜树体内Na＋质量分数显著升高，使K＋上运、Ca2＋下运，且随着胁迫强度增强而加剧，其中碱性盐对体内Na＋、K＋、Ca2＋质量分数的影响较大。盐碱胁迫降低了根、茎、叶中K＋质量分数／Na＋质量分数、Ca2＋质量分数／Na＋质量分数，且随着中性盐（ NaCl和Na2 SO4）与碱性盐（ NaHCO3和Na2 CO3）质量分数增加其K＋质量分数／Na＋质量分数、Ca2＋质量分数／Na＋质量分数降低幅度增加，其影响程度由小到大的顺序为Na2 SO4、NaCl、NaHCO3、Na2 CO3。盐碱胁迫降低了K＋、Ca2＋由根向茎中选择性运输的能力，增加了叶对K＋、Ca2＋的选择性吸收。中性盐对K＋、Ca2＋由根向茎选择性运输能力的影响低于碱性盐，但对由茎向叶中选择运输K＋、Ca2＋的能力的影响与之相反。总之，喜树在低强度盐碱胁迫下通过牺牲根、茎生物量积累维持叶的生长来稀释叶中迅速累积的Na＋，同时通过吸收Na＋降低渗透势维持对水分和矿质元素的吸收，另外，通过提高向叶中运输K＋部分消除叶中的Na＋毒害，又通过向根中运输Ca2＋部分消除根中的Na＋毒害，表现出一定的主动适应性。
연구료Na＋등질량분수하중성염（ NaCl화Na2 SO4）여감성염（ NaHCO3화Na2 CO3）대희수유묘생물량、체내리자선택성운수효응。결과표명：염감협박억제료희수근、경생물량적적루；고농도중성염사협생물량증가，고농도감성염사협생물량대폭강저；감성염대생물량적영향대우중성염。염감협박사희수체내Na＋질량분수현저승고，사K＋상운、Ca2＋하운，차수착협박강도증강이가극，기중감성염대체내Na＋、K＋、Ca2＋질량분수적영향교대。염감협박강저료근、경、협중K＋질량분수／Na＋질량분수、Ca2＋질량분수／Na＋질량분수，차수착중성염（ NaCl화Na2 SO4）여감성염（ NaHCO3화Na2 CO3）질량분수증가기K＋질량분수／Na＋질량분수、Ca2＋질량분수／Na＋질량분수강저폭도증가，기영향정도유소도대적순서위Na2 SO4、NaCl、NaHCO3、Na2 CO3。염감협박강저료K＋、Ca2＋유근향경중선택성운수적능력，증가료협대K＋、Ca2＋적선택성흡수。중성염대K＋、Ca2＋유근향경선택성운수능력적영향저우감성염，단대유경향협중선택운수K＋、Ca2＋적능력적영향여지상반。총지，희수재저강도염감협박하통과희생근、경생물량적루유지협적생장래희석협중신속루적적Na＋，동시통과흡수Na＋강저삼투세유지대수분화광질원소적흡수，령외，통과제고향협중운수K＋부분소제협중적Na＋독해，우통과향근중운수Ca2＋부분소제근중적Na＋독해，표현출일정적주동괄응성。
We studied the biomass, Na+ , K+ and Ca2+ mass fractions and ionic selective transportation and distribution of organand tissue levels in Camptotheca acuminata seedlings exposed to conditions of the same Na+ mass fraction for understandingthe responses of plants to salt and alkali stresses. The salt and alkali stresses inhibited the accumulation of root and stembiomass, and neutral salt in high concentration increased leaf biomass, and alkali salt in high concentration significantlydecreased leaf biomass. The effect of alkali stress on the biomass accumulation was bigger than that of salt stress. Na+ massfractions of root, stem and leaf in seedlings remarkably increased under salt and alkali stresses, and the effects of NaCl andNa2SO4 stresses on Na+ mass fraction were smaller than those of NaHCO3 and Na2CO3. Salt and alkali stresses made K+transport from root to leaf, and Ca2+ transport from leaf to root which exacerbated with the increase of stress intensity, andthe effects of K+ and Ca2+ transportation on alkali stress were bigger than those on salt stress. Salt and alkali stresses madeK+ / Na+ , Ca2+ / Na+ of root, stem and leaf decrease which was exacerbated as the salt and alkali mass fractions increased.The order of the effects of K+ / Na+ , Ca2+ / Na+ of root, stem and leaf from small to big was Na2SO4, NaCl, NaHCO3 andNa2CO3. The ability of K+ , Ca2+ selective transportation from root to stem decreased and the ability of leaf K+ , Ca2+ selec?tive absorption increased under salt and alkali stresses. The effects of the ability of K+ , Ca2+ selective transportation fromroot to stem on NaCl and Na2SO4 stresses were smaller than those on NaHCO3 and Na2CO3 stresses, but the effects of theability of leaf K+ , Ca2+ selective absorption under salt and alkali stresses was opposite. Under low salt and alkali stresses, Camptotheca acuminata maintained leaf growth to dilute rapidly elevating Na+ by decreasing the accumulation of root andstem biomass, and maintained the adoption to water and mineral element by adopting Na+ to decrease osmotic potential,and avoided Na+ toxicity in leaf by increasing K+ transportation to leaf and Na+ toxicity in root by increasing Ca2+ transpor?tation to root. Therefore, Camptotheca acuminata is with initiative adaptability.