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Development,differentiation,and material distribution of secondary phloem in Pinus massoniana

Journal of Forestry Research 2023年第6期34卷 1915-1926页

作者： Chao Yang Fuhua Fan Gang Xu Guijie Ding Institute for Forest Resources and Environment of Guizhou Province Guizhou UniversityGuiyang 550025People’s Republic of China Key Laboratory of Forest Cultivation in Plateau Mountain of Guizhou Province Guiyang 550025People’s Republic of China College of Forestry Guizhou UniversityGuiyang 550025People’s Republic of China

Phloem is the woody tissue for the storage and long-distance transport of organic matter in vascular *** reveal the process of secondary phloem development and differentiation in Pinus massoniana,the structure of the secondary phloem and the distribution of cell inclusions were observed by histochemical staining,spontaneous fluorescence of phenolic substances and cell *** on tissue development and differentiation characteristics of *** secondary phloem,the secondary phloem development was divided into seven stages:the functional phloem stage;the sieve cell lignification stage;the phloem ray bending stage;the parenchyma cell dedifferentiation and division stage;the dedifferentiated parenchyma cell population formation stage;the periderm alteration stage,and the rhytidome *** analysis of cell morphology and inclusion distribution characteristics showed that the sieve cells were deformed during lignification,the quantities of parenchyma and resin ducts increased with development and the crystal content in cells,as well as the levels of sugars and lipids in phloem parenchyma cells,increased with *** results indicate that the *** phloem first lost longitudinal transport function and then increased its secretory,storage and mechanical ***,the parenchyma differentiated into the cortex and periderm,and the tissue outside the new periderm lignified to form the rhytidome,which fully developed into the protective tissue of the stem.

关键词： P.massoniana Phloem Periderm lignifi cation Inclusion

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