传递细胞/ Transfer cells Ingrowth of cell wall; important role in transferring dissolved substances between adjacent cells Sieve element ) Wall ingrowth 2.5m Transverse section of a portion of the phloem from a small vein of a Senecio leaf, arrows indicating wall ingrowth
传递细胞/Transfer cells Ingrowth of cell wall; important role in transferring dissolved substances between adjacent cells Transverse section of a portion of the phloem from a small vein of a Senecio leaf, arrows indicating wall ingrowth. Sieve element Wall ingrowth
输导组织 Conducting Tissue 木质部Xyem 韧皮部 Chloe ° Complex tissue, Complex tissue, at least consisting of at least 2 over 2 types of cells kinds of cells Conducting cells Conducting cells(sieve (tracheids vessel cells sieve tube elements ), elements), thick-walled usually only with primar and dead at maturity wall and alive at maturity Functions: conducting · Functions: mainly water and minerals conducting photosynthetic products( sugars)
输导组织 Conducting Tissue 木质部 Xylem • Complex tissue, consisting of at least 2 kinds of cells • Conducting cells (tracheids + vessel elements), thick-walled and dead at maturity. • Functions: conducting water and minerals 韧皮部 Phloem • Complex tissue, at least over 2 types of cells • Conducting cells (sieve cells + sieve tube elements), usually only with primary wall and alive at maturity. • Functions: mainly conducting photosynthetic products (sugars)
木质部 Xylem
木质部 Xylem
Xyem质部 Tracheid管胞; Vessel elements导管分子 Fib vessel element Vessel element Qe a Ray cell Tracheid Fa Parenchyma cell parenchyma cell Figure 7-5 Cells of the xyle
Xylem木质部 Tracheid管胞; Vessel elements导管分子 Vessel element Ray cell Parenchyma cell Tracheid Fiber
导管类型 Types of the vessel elements 环纹 circular th sickening 螺纹 helical thickening 绨纹 scalariform thickening 网纹 reticular thickening 孔纹pted c kening meaN e BooDac
导管类型 Types of the Vessel Elements ¾ 环纹 circular thickening ¾ 螺纹 helical thickening ¾ 绨纹 scalariform thickening ¾ 网纹 reticular thickening ¾ 孔纹 pitted thickening