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草业学报  2013 

盐胁迫下磷素对沟叶结缕草生长及Na+和K+含量的影响

DOI: 10.11686/cyxb20130321

Keywords: 沟叶结缕草,磷素,抗盐性,生长,离子调控

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Abstract:

采用水培法研究了盐胁迫(300mmol/LNaCl)下不同浓度磷素(0,1,5,20mmol/L)对沟叶结缕草生物量以及钠钾离子调控方面的影响。结果表明,缺磷和盐胁迫均抑制了沟叶结缕草的生长。在磷和盐的双重胁迫下,并没有表现出叠加效应。在缺磷环境下,缺磷对植物生长的抑制比盐胁迫的影响更大。不管有无盐胁迫,随培养液中磷素浓度增加,沟叶结缕草的生长受到促进,但在20mmol/L磷浓度处理时植株的生长反而受到一定的抑制。适量磷素促进了沟叶结缕草的根系生长,有提高叶片Na+分泌量,抑制Na+从根系往叶片的运输,减低叶片Na+的积累,提高K+的吸收和选择性运输,增加叶片K+积累的趋势,但相关指标并不显著。同时提高了叶片K+/Na+,促进了植物的生长。

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