应用~（35）S示踪技术研究油菜对硫的吸收与运转

将（３５）￣ＳＯ应用于土壤、叶面和荚表面，根据对成熟植株各部位放射性的测定，了解不同时期油菜对硫的吸收、运转和分配。试验表明，油菜对施于土壤中（３５）￣Ｓ的吸收以花期最高，苔期其次，移栽期最低。除苔期外，其他时期有４０％从土壤吸收的（３５）￣Ｓ运往籽粒。应用于顶部４叶的（３５）Ｓ，在成熟植株中回收约５０％，包括留在标记叶的２０％左右。从荚中的回收率除苗期较低外，其他时期在２１％～２３％范围内，其中大部分在分枝荚。开花后不同时期应用于主茎荚表面的（３５）Ｓ，有１３％～１６．８％转移到主茎荚内籽粒中，运往分枝荚籽粒中的不到１０％。

STUDIES ON UPTAKE AND TRANSLOCATION OF SULPHUR IN OILSEED RAPE PLANT USLNG (35)￣S TKACER TECHNIQUE

The experiments were conducted to investigate the uptake and translocation of (35)￣ S in oilseed rape at different stages.The results showed that uptake of sulphur from soil byrapeplant were 23.59%,31.65%。and 49. 13%of sulphur applied at transplanting,bolting andflowering stage ,respectively. About 40%of(35)￣ S taken from soil was located in seeds for trans-planting and flowering stage applying.About 20% of sulphur applied on top four leaves atvarious stages of growth was remained in labelled leaves and 21%～23%was transported topods with majority in branch pods.40%～60%of sulphur which was applied on surface ofpods at lower stem.at different time after flowering was remained in shell or labelled pods and 13%～16.8%of that was transfered into seeds of labelled pods.Recoveries of labelledsulphur applied on pods from seeds of pods at branches were less than 10%, The transporta-tion of (35)￣S from labelled sites to seeds of labelled pods and unlabelled pods was declinedsharply as labelling was carried out at 6 weeks after flowering