烟草叶片中草酸形成及其向下运输(简报)

Formation of Oxalate in Tobacco Leaves and the Downward Transport

摘要:

水培条件下烟草根、茎、叶中的草酸含量呈极显著正相关。光照条件下用¹⁴CO₂饲喂烟草叶片后,叶中很快有大量¹⁴C-草酸形成,随后分别在茎、根中检测到¹⁴C-草酸,时间上相差约1 h。这表明烟草叶片通过光合固定CO₂,其光合产物可很快转化为草酸,部分草酸可通过茎向根部运输。

Abstract:

Oxalate content in the roots, stem and leaves of hydroponically-cultured tobacco plants was very significantly correlated. When plant leaves were fed with ¹⁴CO₂, a large amount of ¹⁴C-oxalate rapidly emerged in the leaves, followed in the stem, and then in the roots, with a lag about one hour. The result indicated that oxalate might be rapidly formed in the leaves through photosynthetic CO₂ fixation, and part of it was then transported to the roots through the stem.