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冰川冻土  2015 

NaCl胁迫对甜叶菊移栽苗生理生态特性的影响

DOI: 10.7522/j.issn.1000-0240.2015.0061, PP. 538-544

Keywords: 甜叶菊,光合作用,生物量分配,NaCl胁迫,低促高抑

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Abstract:

通过盆栽法,研究了不同浓度NaCl胁迫对甜叶菊移栽苗生理生态特性的影响.结果表明NaCl对甜叶菊移栽苗生长的胁迫表现为低促高抑的效应,即0~44mmol·L-1浓度下,NaCl处理对甜叶菊移栽苗光合作用和生长具有促进作用;44~140mmol·L-1浓度下,甜叶菊光合参数、干叶产量、长势等逐渐下降;大于140mmol·L-1浓度下,甜叶菊将不能存活.低浓度NaCl胁迫下,甜叶菊叶生长量增加,而茎和根的生长量与其他NaCl胁迫一样,表现为增长量降低.甜叶菊通过增加叶生物量适应低盐胁迫,是甜叶菊叶子的增产新机制,为生物量的分配研究提供了新的佐证.此外,所确定的Na+影响甜叶菊生长的低促高抑的浓度范围,为今后甜叶菊规模化和精细化栽培种植提供了理论基础.

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