为了探索La(Ⅲ)对UV-B辐射胁迫下大豆幼苗内源激素的影响,试验以大豆幼苗为材料,采用水培实验的方法研究了La(Ⅲ)对UV-B辐射胁迫下大豆幼苗生长素(IAA)、生长素氧化酶(IAAO)、脱落酸(ABA)、赤霉素(GA)的影响.结果表明,UV-B辐射(T1:0.15W·m-2和T2:0.45W·m-2)胁迫下,大豆幼苗IAA、IAAO、ABA、GA含量在胁迫期(1d～5d)和恢复期(6d～11d)分别呈现"先下降后有所回升"、"先升后降再升"、"先升后降"、"下降"趋势.而各处理组IAA和GA含量La(Ⅲ)+UV-B>UV-B,La(Ⅲ)>CK,La(Ⅲ)+T1>La(Ⅲ)+T2;LAAO活性和ABA含量恰与之相反.表明La(Ⅲ)可减缓UV-B辐射对大豆幼苗的伤害,且对低剂量(T1)的防护效果优于高剂量(T2),进而在防御系统层面实现了La(Ⅲ)对UV-B辐射伤害大豆幼苗的防护效应.
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