Department of Botany, University of Wisconsin, Madison.
Planta. 1971 Sep;100(3):262-7. doi: 10.1007/BF00387042.
The sieve-plate pores of sieve elements in leaf veins of Hordeum vulgare, fixed in glutaraldehyde with postfixation in osmium tetroxide, were lined by the plasmalemma and variable amounts of callose. All pores were filled with endoplasmic reticulum, which was continuous from cell to cell. Mature sieve elements lacked P-protein.
大麦叶片叶脉中的筛分子的筛板孔，用戊二醛固定，再用四氧化锇后固定，孔边缘由质膜和不定量的胼胝质排列。所有的孔都充满了内质网，内质网从一个细胞连续到另一个细胞。成熟的筛分子缺乏 P 蛋白。
