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几种浮游单细胞藻类磷代谢的初步研究 总被引:7,自引:3,他引:7
用32PO43-同位素稀释法研究了单种一次培养的几种浮游单细胞藻类的磷代谢.小球藻(Chlorellasp.)和一种绿藻对PO43-的最大吸收速率(Vmax)与细胞磷含量成负相关,半饱和速率常数(Ks)与藻类的种类相关.光照与黑暗对中华盒形藻(BiddulphiasinensisGrevile)和金藻(Dicrateriasp)PO43-的吸收和再生代谢无明显影响,其昼夜变化是藻类细胞新陈代谢的反映;处于细胞周期G1期与S期的藻类有较高的磷吸收和再生代谢速率,而G2期与M期的磷代谢速率较低.藻类磷代谢的动力学及其昼夜变化是围绕着对营养盐磷最大程度地利用和维持藻类持续生长的机制展开的. 相似文献
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Xia Mingzhong 《西昌学院学报(自然科学版)》1999,(1)
In pot experiments at Xichang,China,during 1989~1994,visual senescencesymptoms and associated changes in constituent contents and activities of leaves of fababean(Vicia faba L.)were compared in respones to flower removal.The leaves from upper,middle and lower positions were sampled six times during reproductive developmentphase.At 70 DAP flower removal had caused 37%~189% and 82%~197% increase ofgreen leaf area and green leaf dry weight per plant respectively.Flower removal led to asignificant increase in the chlorophyll,soluble sugar and protein contents and the catalaseactivity.The leaf cell relative electroconductivity of those plants was maintained at a lowerlevel,relative to the control,during the late growing stage.These results certainly impliedthat the leaves of flower removal plants were still fully functional at a very late growingstage,consequently the plants increased many new branches per plant. 相似文献