Effects of Low Phosphorus Stress on the Chlorophyll Fluorescence of Different Phosphorus Use Efficient Maize (Zea mays L.)
Effects of Low Phosphorus Stress on the Chlorophyll Fluorescence of Different Phosphorus Use Efficient Maize (Zea mays L.)
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发表时间：
2004
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通讯作者：
Li Shao
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作者：
Li Shao
对高磷（+P）和低磷（-P）条件下生长的高磷（+P）和低磷（-P）基因型玉米自交系KH5和Q201的老(2)叶和新(4)叶展开期的叶绿素荧光进行了测定。结果表明：低磷胁迫导致PSⅡ反应中心的紧密度增加，光能转换效率和电子传递效率降低，过量激发能增加；与低PE基因型玉米（Q201）相比，高PE基因型玉米（KH5）光能转换和电子传递效率更高，受低磷胁迫的影响较小。对于过量激发能的耗散，高PE基因型玉米（KH5）通过天线色素的耗散增强，低PE基因型玉米（Q201）通过天线色素的耗散减弱，其他方式的耗散增强。叶片磷含量与F v/ F m呈极显著的指数关系（y =7.59×（0.09- e -59.46 ×））， 0.1 mg·g -1 FW为叶片磷含量影响F v/ F m的阈值，低于该阈值时，F v/ F m显著降低。
Chlorophyll fluorescence of old (2nd) and newly expanded (4th) leaf of KH5 and Q201, which belong to high phosphate use efficiency (PE) and low PE genotype maize inbred lines respectively, grown at high (+P) and low (-P) phosphorus conditions, were determined at 4th leaf expanded stage. The results showed that low phosphorus stress caused the increase in close degree of PSⅡ reaction center, decrease in efficiency of light energy transformation and electron transportation, and increase in excessive excited energy. With compared to low PE genotype maize (Q201), the efficiency of light energy transformation and electron transportation was higher in high PE one (KH5), and less affected by low P stress. For the dissipation of excessive excited energy, thermal energy dissipation through antenna pigments were enhanced in high PE genotype maize (KH5), whereas in low PE ones(Q201) thermal energy dissipation was weakened, and other ways of energy dissipation were enhanced. The relationship between leave P content and F v/ F m fits a exponential curve ( y =7.59×(0.09- e -59.46 x ) ) significantly, and 0.1 mg·g -1 FW was the threshold for leaves P content affecting F v/ F m, F v/ F m would be decreased dramatically when leave P content below this threshold.