›› 2013, Vol. 21 ›› Issue (3): 526-533.DOI: 10.11733/j.issn.1007-0435.2013.03.018

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Effects of Different Phosphorus Concentrations on the Growth and Photosynthesis of Zoysia matrella under Salt Stress

JIANG Qiao-feng, CHEN Jing-bo, ZONG Jun-qin, LI Shan, CHU Xiao-qing, GUO Hai-lin, LIU Jian-xiu   

  1. Institute of Botany, Chinese Academy of Sciences, Nanjing, Jiangsu Province 210014, China
  • Received:2012-11-28 Revised:2013-02-28 Online:2013-06-15 Published:2013-06-05

NaCl胁迫下不同磷浓度对沟叶结缕草生长及光合特性的影响

蒋乔峰, 陈静波, 宗俊勤, 李珊, 褚晓晴, 郭海林, 刘建秀   

  1. 江苏省中国科学院植物研究所 南京中山植物园, 江苏 南京 210014
  • 通讯作者: 刘建秀
  • 作者简介:蒋乔峰(1988- ),男,江苏常州人,硕士研究生,研究方向为草坪草栽培生理,E-mail:JQFchangzhou@126.com
  • 基金资助:
    国家科技支撑计划项目(2011BAD13B09)(2012BAB03B04);江苏省农业科技支撑项目(BE2010309)资助

Abstract: Effects of phosphorus (0, 1, 5 and 20 mmol稬-1) on the biomass and photosynthesis of Zoysia matrella were investigated under salt stress (300 mmol稬-1 NaCl) using hydroponic method. Results showed that NaCl stress decreased plant growth. Shoot dry weight and root dry weight of Zoysia matrella were promoted with increasing P concentration, and they were inhibited when P concentration was 20 mmol稬-1. Chlorophyll and carotenoid contents were increased under salt stress, but they were not significantly affected by increasing P concentration. Salt stress decreased net photosynthesis rate, stomatal conductance, intercellular CO2 concentration and transpiration rate, which was relieved with increasing P concentration. Although salt sensitive index was decreased with increasing P concentration, the reasonable amount of P can improve the salt resistance of Zoysia matrella by promoting the photosynthetic rate and growth of plant.

Key words: Zoysia matrella, Phosphorous, Salt tolerance, Growth, photosynthetic rate

摘要: 采用水培法研究了NaCl胁迫下(300 mmol·L-1)不同浓度磷素(0, 1, 5和20 mmol·L-1)对沟叶结缕草(Zoysia matrella)生物量及光合作用的影响。结果表明:NaCl胁迫显著抑制了沟叶结缕草的生长。随培养液中磷浓度增加,沟叶结缕草的枝叶干重和根系均受到促进,但在20 mmol·L-1 磷浓度处理时植株的生长反而受到一定的抑制。NaCl胁迫下,沟叶结缕草的叶绿素和类胡萝卜素含量有所增加,但是磷处理对色素的影响很小。盐处理降低了植株的净光合速率、气孔导度、胞间CO2浓度和蒸腾速率,施加磷能在一定程度上缓解盐胁迫的效应。尽管随着磷素增加,盐敏感指数(SI)下降,但适量磷浓度促进了沟叶结缕草的绝对生长,提高了叶片的光合速率,从而提高其抗盐性。

关键词: 沟叶结缕草, 磷, NaCl胁迫, 生长, 光合特性

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