摘要
以甜瓜高代自交系M10-03为材料,在2叶1心期对甜瓜苗模拟淹水处理,在外源激素IAA、GA、ABA、NPA、PP_(333)、STD诱导下对甜瓜不定根生理特性的影响进行分析。结果表明,随激素处理浓度升高,幼苗不定根数经IAA处理后先降后升,在浓度为1.0 ng/L时达到峰值;GA处理甜瓜幼苗不定根的生根数和发生区域均大于CK,且呈下降趋势,NPA对不定根发生区域的影响不大;PP_(333)处理甜瓜幼苗不定根生根数及发生区域先升高后降低,在浓度为100 mg/L时达到峰值;ABA处理后甜瓜幼苗不定根数先降后升,在25 ng/L时为低值;STD处理呈先升后降趋势,在25 ng/L处达到峰值,不定根发生区域长度为对照的1.85倍。激素及激素抑制剂均能增强甜瓜幼苗根系活力,IAA和STD处理甜瓜幼苗根系活力均升高;施加GA和PP_(333)时,甜瓜幼苗根系活力先升后降,在浓度100 mg/L时达到峰值。甜瓜幼苗真叶叶绿素a、叶绿素b的含量均呈下降趋势,PP_(333)(100 mg/L)及STD(25 ng/L)处理甜瓜幼苗真叶叶绿素a和叶绿素b含量最低;ABA处理对叶绿素影响不明显。甜瓜幼苗真叶类胡萝卜素含量经IAA处理后升高,NPA、PP_(333)、ABA、STD处理后先高后低,GA处理后呈降低趋势。
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