为评估丛枝菌根真菌(AMF)对核桃(Juglans regia Linn.)幼苗耐盐性的促进效果,以核桃品种‘温185’(‘Wen 185’)的盆栽苗为材料,分别接种摩西斗管囊霉〔Funneliformis mosseae(*** et Gerd.)*** et ***üler〕和异形根孢囊霉〔Rhizo...
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为评估丛枝菌根真菌(AMF)对核桃(Juglans regia Linn.)幼苗耐盐性的促进效果,以核桃品种‘温185’(‘Wen 185’)的盆栽苗为材料,分别接种摩西斗管囊霉〔Funneliformis mosseae(*** et Gerd.)*** et ***üler〕和异形根孢囊霉〔Rhizophagus irregularis(Blaszk.,Wubet,Renker et Buscot)*** et ***üler〕,测定了0、100、200、300 mmol·L^(-1) NaCl处理下根系的生长指标、抗氧化酶活性、渗透调节物质含量、内源激素含量及叶片和根系中矿质元素含量。结果表明:NaCl胁迫下,核桃幼苗的根系生长受到抑制,在300 mmol·L^(-1) NaCl处理下接种2种AMF均显著(P<0.05)提高了根系体积。随着NaCl浓度升高,根系抗氧化酶活性及过氧化氢(H_(2)O_(2))和丙二醛(MDA)含量整体上显著升高;在300 mmol·L^(-1) NaCl处理下,接种摩西斗管囊霉显著提高了根系超氧化物歧化酶(SOD)和抗坏血酸过氧化物酶(APX)活性,接种异形根孢囊霉显著提高了根系APX活性,接种2种AMF均显著降低了根系H_(2)O_(2)和MDA含量。在300 mmol·L^(-1) NaCl处理下,接种2种AMF均显著提高了根系可溶性糖含量。各浓度NaCl处理下,接种2种AMF均显著提高了根系吲哚乙酸、脱落酸、赤霉素3和玉米素核苷含量。随着NaCl浓度升高,叶片P、K、Ca、Mg含量整体呈上升趋势;在300 mmol·L^(-1) NaCl处理下,接种2种AMF均降低了叶片和根系中P含量,整体显著提高了根系K和Ca含量,接种异形根孢囊霉还显著提高了叶片和根系中Mg含量。在300 mmol·L^(-1) NaCl处理下,接种异形根孢囊霉显著提高了根系Fe含量和叶片Zn含量,接种摩西斗管囊霉显著提高了根系Fe含量。随着NaCl浓度升高,未接菌幼苗叶片和根系中Na含量整体呈上升趋势,而K/Na比、Ca/Na比和Mg/Na比则相反;在300 mmol·L^(-1) NaCl处理下,接种2种AMF均显著降低了根系Na含量,且接种摩西斗管囊霉还显著降低了叶片Na含量并显著提高了叶片和根系中K/Na比、Ca/Na比和Mg/Na比。综上所述,摩西斗管囊霉和异形根孢囊霉对核桃幼苗的耐盐性提高具有明显促进作用,且这2种AMF的作用机制可能存在差异。
In order to study the growth traits of Catalpa bungei clones in various growth periods during the nursery stage so as to provide a theoretical basis for genetic improvement,the authors matched the height and diameter ...
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In order to study the growth traits of Catalpa bungei clones in various growth periods during the nursery stage so as to provide a theoretical basis for genetic improvement,the authors matched the height and diameter in nursery stage by Logistic *** results showed that the mean height of clones was 325.19 cm,with the range of 253.48-402.88 cm,the mean basal diameter of clones was 4.29 cm,with the range of 3.61-5.05 *** height increment could be divided into two stage,*** early-growing period and the fast-growing period,while the basal diameter increment could be divided into three stage,*** early-growing period,the fast-growing period and the late-growing *** beginning of fast-growing period,the end of fast-growing period,the duration of fast-growing period,and the daily mean height increment in fast-growing period were May 26-July 2,September 11-October 15,72-128 days,and 1.70-2.88 cm,while that for basal diameter increment were May 9-June 5,August 23-October 3,95-138 days,and 0.021-0.032 *** variation of traits in fast-growing period was more *** height and basal diameter were significantly correlated to their increments in earlygrowing period(0.744,0.928),fast-growing period(0.965,0.804),and their daily mean increment in fastgrowing period(0.733,0.811).
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