PMID: 15346985Sep 7, 2004Paper

The ultrastructures of storage protein accumulation in aleurone layer and cotyledons of Fagopyrum esculentum

Shi yan sheng wu xue bao
Xin Qi GaoXiang Yuan Xi

Abstract

The ultrastructures of storage protein accumulation in cotyledons and aleurone layer in buckwheat (Fagopyrum esculentum Monch) were investigated by electron microscopy. (1) On 15 days after anthesis (DAA), there are many dictyosomes and vacuoles accumulating protein in cytoplasm of the outer layer endosperm cells. These cells containing abundant aleurone grains (1-2 microm in diameter) from vacuoles accumulated storage protein form aleurone layer where division of aleurone grain is also observed on 25 DAA. (2) On 20 DAA, protein begins to accumulate in vacuoles of cotyledon cells. At the early stage of protein deposition, vacuoles are becoming smaller ones by ingrowth of tonoplast or by pinch-off. A multitude of ribosomes, many dictyosomes and electron-dense vesicles (0.1-0.7 microm in diameter) coated with membrane are observed in cytoplasm of cotyledon cells at every stage of protein accumulation. Originated from the separation of saccules containing protein at the fringe of dictyosome, these vesicles (0.1-0.2 microm in diameter) probably increase their volume by fusion each other. They play the leading role in transporting storage protein into vacuoles that become PSVs in cotyledon cells of buckwheat. On 25 DAA, there are ma...Continue Reading

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