返回式卫星搭载后玉米叶绿体色素变化的研究

本文报道了利用返回式卫星搭载处理与地面对照玉米在不同取材时期叶片丙酮提取液的吸收光谱和叶绿体色素含量的变化 ,发现二者的光吸收特性基本相同 ,但吸光度与光吸收带出现某些差异。卫星搭载后 ,单位叶重的叶绿体色素总量和叶绿素a+b含量趋于降低 ,其中以叶绿素b含量降低最甚 ,导致Ca Cb值增高

CHANGES OF CHLOROPLAST PIGMENTS OF MAIZE LEAVES AFTER SPACE FLIGHT IN RECOVERABLE SATELLITE

Dred seeds of maize inbred lines were carried by recoverable satellite flying at an altitute of 175～253 km from sea level.The changes of absorption spectra of acetone extracts and chloroplast pigment contents of maize leaves were studied.It showed that the light absorption characteristics of space flight treatment (SP) were quite similar to those of the corresponding ground controls(CK) at the same time of sampling. However,the absorbance of the SP were less than CK at absorption peaks of chlorophyll a and b,respectively. The contents of chlorophyll a and chlorophyll b of SP were significantly reduced,and the reduction of chlorophyll b far cxceeded chlorophyll a.The contents of chlorophyll a+b were reduced so much that the total amount of their chloroplast pigments was lowered,but Ca/Cb ratio tended to be higher in comparsion with CK.