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- W1982444397 abstract "The process of symbiotic development of Spiranthes sinensis seeds to protocorms with differentiated shoots associated with binucleate Rhizoctonia anastomosis group C was divided into 7 stages (I–VII) based on increase of embryo and protocorm width. Each stage was observed ultrastructurally. The embryo contained large amount of lipid, small amount of starch, and protein body-like structure in all its cells. The embryo began to swell (stage I) as soon as several hyphae invaded the basal cells. Hyphae penetrated into the inner cortical parenchyma (ICP) and subepidermal parenchyma (SEP) cells and formed pelotons. The meristematic region (MR) was not colonized. Hyphal cell walls (FCW) were surrounded by an encasement layer (EL) and by the host plasmalemma. Pelotons that formed in ICP had thin walls and were digested, whereas pelotons in SEP were not digested. In stage I, mitochondria, ribosomes, proplastids, microbodies, rough endoplasmic reticulum, dictyosomes and vacuoles were observed in the host cytoplasm. Signs of hyphal digestion was already apparent in this stage. In stage II, clumps of digested pelotons consisted only of layers of FCW and EL and were surrounded by host cytoplasm and vacuoles, and/or secondary infected hyphae. Hyphal digestion and the reinfection of host cells occurred repeatedly throughout all growth stages. Protein body-like structures rapidly disappeared before stage III. At stage V and subsequent stages, it was also seen that the dispersed contents of digested hyphae were surrounded by the host plasmalemma. When ICP cells contained pelotons, amyloplasts were not observed. However, proplastids usually existed in the cells, and amyloplasts were observed in all SEP cells and other uninfected cells. Lipid bodies were slowly degraded throughout embryo and protocorm growth." @default.
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- W1982444397 date "1992-03-01" @default.
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- W1982444397 title "Ultrastructural changes during the symbiotic development of Spiranthes sinensis (Orchidaceae) protocorms associated with binucleate Rhizoctonia anastomosis group C" @default.
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- W1982444397 doi "https://doi.org/10.1016/s0953-7562(09)80966-0" @default.
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