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中文摘要：
以不同剂量Na N3处理马齿苋种子,从种子萌发、植株生长、光合性能的角度确定最适Na N3处理剂量,并分析以叶绿素荧光动力学方法辅助筛选的可行性。结果表明,1.0 mmol/L Na N3处理8 h或0.5 mmol/L Na N3处理12 h均可显著提高种子萌发率和萌发质量,而更高浓度、更长时间的处理则使萌发率和萌发质量逐渐下降;根据长势初筛后的各处理组种子萌发苗,其株高均高于对照或与对照相当,单叶面积(2.0 mmol/L Na N38 h处理组除外)则低于对照;各处理组叶片PSⅡ的潜在和实际光化学效率普遍高于对照(其中2.0 mmol/L Na N38 h处理组最高),但除2.0 mmol/L Na N38 h处理组外,各组对高光强的抵御能力,特别是快速保护能力均有所下降。2.0 mmol/L Na N38 h处理组中马齿苋种子获得植株的株型最高、单叶面积最大、潜在和实际光化学活性最强、抵御强光胁迫能力最强。可见,以2.0 mmol/L Na N3处理8 h是马齿苋种子的最适处理条件,而采用叶绿素荧光动力学分析技术可实现对当代植株光合能力、高光强抗性的无损伤分析,极有利于提高筛选效率。
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