水稻花粉白苗叶片中叶绿素的积累

CHLOROPHYLL ACCUMULATION IN LEAVES OF RICE POLLEN ALBINOS

与花粉绿苗相比,水稻花粉白苗仅含微量叶绿素,但其(脱植基)原叶绿素及类胡萝卜素的相对含量则高于绿苗。花粉白苗叶片中的叶绿素等色素的含量还会随照光规律的变化而显示出一定规律性的变化。花粉白苗再生植株的叶绿素积累亦具有相似的特点,但色素的含量更低。花粉白苗及其再生植株的这些特性似与其质体缺乏膜系统有关,而后者又可能是质体基因组发生突变的结果。鉴于花粉白苗各个单株的叶绿素等色素的含量相互间呈现出差异,可以推论,花粉白苗叶片的质体在结构上和功能上是不均一的。

In contrast to the green plantlets,rice pollen albinos contain a little chlorophyll only,and the relative contents of protochlorophyll(ide)and carotenoids comparing with chlorophyll are much higher however.The contents of chlorophyll and related pigments in leaves of pollen albinos vary regularly with the variation of light regimes.The spectra of regenerated albinos from pollen albinos possess the same characteristics as described above,but their pigment con- tents are lower.It is likely that the occurrence of these characteristics of pollen albinos may be attributed to their deficiency of plastid membrane system and the latter in turn may be the result plastom mutation.In view of the variation of pigment contents among different plantl- ets of the same variety,it is resonable to deduce that plastids of pollen albinos are heterogen- eous structurally and functionally.