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CaCl_2、GB、ALA对番茄幼苗耐低温与弱光性的影响
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摘要
预试验中筛选出对番茄幼苗耐低温弱光交互胁迫有促进作用的三种化学物质:1mmol/L的CaCl_2、2.5mmol/L的GB(甜菜碱)、30mg/L的ALA。本研究对三种化学物质在单一低温胁迫与单一弱光胁迫方面的功效进行了进一步研究,结果表明:三种物质均能显著提高番茄幼苗的抗单一低温能力,表现在:三种化学物质处理的番茄幼苗在经受单一低温胁迫后,净光合速率与气孔导度都显著地高于清水处理的对照,且萎蔫指数也显著低于清水处理的对照,其中尤以1mmol/L CaCl,效果最好;在耐单一弱光方面,喷施30mg/L的ALA与2.5mmol/l的GB的并经受单一弱光后,番茄幼苗的净光合速率和气孔导度都高于清水处理的对照,叶绿素含量(SPAD值)也高于对照,但是1mmol/L的CaCl_2处理效果不明显。
In the preceding research,CaCl_2 of 1mmol/L、GB of 2.5mmol/L、ALA of 30mg/L have been selected as effective in enhancing the anti-chilling/low light of tomato seedling.In this research,the functions of the 3chemicals against single chilling and sing low light was tested.Results shows that the 3 chemicals can enhance the resistance ability of the tomato seedlings against single chilling,which boast higher net photosynthesis rate(Pn),higher stomata conductivity(Cs) and lower withering index than CK.CaCl_2 of 1mmol/L is the most effectively resistant to single chilling.ALA of 30mg/L and GB of 2.5mmol/L can enhance the endurance ability of tomato seedlings against single low light,which boast higher rate of Pn,higher Cs value and higher SPAD value than CK,whereas CaCl_2 of 1mmol/L make no difference.
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