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采用水培实验，以ＰＥＧ进行水分胁迫（－０．５ＭＰａ），测定了有磷和缺磷情况下玉米苗期叶片中叶绿素、类胡萝卜素及原叶绿素酸酯随不同胁迫周期的变化。结果表明，水分胁迫时磷能使叶绿素ａ和类胡萝卜素降解减慢，表现为Ｃｈｌａ／ｂ值增大及Ｃｈｌｔ／Ｃａｒｏ值随胁迫周期延长而呈Ｖ．型曲线变化。干旱缺磷能造成原叶绿素酸酯相对积累，是导致Ｃｈｌａ下降的重要因素。水分胁迫下叶绿素ａ，ｂ和Ｃａｒｏ及Ｐｃｈｌ含量均呈下降趋势，而交替变换水处理能减缓光合色素的分解
Hydroponic experiments were conducted to study the changes of chlorophyll, carotenoid and protocatechuic acid in leaves under different phosphorus and phosphorus deficiencies with PEG under water stress (-0.5MPa). The results showed that phosphorus could slow down the degradation of chlorophyll a and carotenoids under water stress, showing the increase of Chla / b value and the increase of Chlt / Caro value with the prolongation of stress period. Curve changes. Arid phosphorus deficiency can cause the relative accumulation of chlorophyll, which is an important factor leading to the decrease of Chla. The contents of chlorophyll a, b, Caro and Pchl showed a decreasing trend under water stress, while the alternation water treatment could slow the decomposition of photosynthetic pigments