摘要
选取小麦(Triticum aestivum Linn.)为供试植物,利用盆栽试验研究了不同添加量的硅(0、50、100 mg·kg-1)对高硼(300 mg·kg-1)高盐(5 g·kg-1氯化钠)胁迫下植物生长以及对主要无机离子吸收的影响。结果表明,在硼盐联合胁迫下,硅能够提高小麦生物量,抑制对硼和钠的吸收,促进钾的吸收,降低植株钠钾比(Na/K),对钙、镁离子的吸收则没有显著影响。100 mg·kg-1硅处理对硼盐联合胁迫的缓解效果大于50 mg·kg-1硅处理。研究认为,硅能够通过抑制小麦对硼和钠的吸收,促进钾的吸收,缓解硼和盐联合胁迫对小麦生长的抑制作用。
Silicon(Si)has showed to improve the tolerance of plants to abiotic stresses. However, it is still unclear whether Si can enhance plant tolerance to combined stresses of excessive B and high salinity. A pot experiment was conducted with wheat(Triticum aestivum Linn.)grown in combined B(300 mg·kg^-1), salinity(5 g·kg^-1 NaCl), and Si(0 mg·kg^-1, 50 mg·kg^-1, and 100 mg·kg^-1)to investigate the growth and ion uptake of wheat. Silicon increased wheat biomass and potassium(K)uptake, but inhibited the uptake of B and sodium(Na), thus reducing the tissue Na/K ratios. Silicon showed no significant effects on calcium(Ca)and magnesium(Mg)uptake. A greater alleviating effect of Si on combined stresses of B and salinity was observed under 100 mg Si·kg^-1than under 50 mg Si·kg^-1. These results suggest that Si is able to alleviate the inhibition of wheat growth by combined stress of B and salinity via reducing B and Na accumulation and promoting K uptake.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2014年第8期1479-1484,共6页
Journal of Agro-Environment Science
基金
国家自然科学基金项目(31370519)
天津市自然科学基金项目(14JCYBJC22700)
中央高校基本科研业务费专项
关键词
硅
硼毒害
盐胁迫
盐度
小麦
silicon
boron toxicity
salt stress
salinity
wheat