木槿花期花瓣生理生化变化的研究

为探明高等植物花期花瓣的生理生化动态变化,以木槿花为材料,测定了自然花期中花瓣部分生理生化指标.结果表明:在整个木槿单花花期(一个白昼)中,花瓣浸出液的相对电导率(REC)和花瓣中丙二醛(MDA)含量持续上升,在花瓣开始萎蔫的20:00时达到最高峰;花瓣中花青素含量在8:00~10:00时较低,12:00时含量升高并维持平台期,18:00时后迅速下降;花瓣中还原性糖含量和花瓣干鲜比(DW/FW)的变化均为单峰曲线,DW/FW峰值出现在16:00时,还原性糖含量14:00时最高;花瓣超氧化物歧化酶(SOD)活性和超氧阴离子(O2.-)产生速率的变化为双峰曲线,峰值分别在8:00时与16:00时、12:00时与16:00时.

Changes of Physiology and Biochemistry in Petals of Shrub-altheas During Senescence

To explore the changes of physiology and biochemistry in petals of higher plants,some physiological and biochemical indexes in petals of the Shrub-althea flowers are respectively measured during natural senescence in this study.The results indicate that during the whole florescence of single Shrub-altheas(one daylight),the relative electronical condutivity of petals lixivium and MDA content always increase,and they reach their respective peak when the petals fade at 20:00.The content of anthocyanin is low between 8:00 and 10:00,raising from 12:00 to 18:00 and then begin to decrease.There is a peak on the content of reductive sugar,raising before 14:00 and began to decrease,so does the DW/FW at 16:00.Further,the SOD activity of petals have two peaks,respectively at 8:00 and 16:00,as well as the rate of production of superoxide anion at 12:00 and 16:00.