Strands of phloem uas muaj tam sim no ntawm qhov chaw ntawm pith yog lub npe hu ua intraxylary phloem. Nws lub xub ntiag tseem txwv rau ib feem me me ntawm eudicots thiab suav tias yog ib tus cwj pwm zoo rau qee tsev neeg.
Intraxylary phloem yog dab tsi?
Interxylary phloem yog muaj phloem strands embedded nyob rau hauv lub thib ob xylem (ntoo), thiab tsim los ntawm kev ua ntawm ib tug cambium (Carlquist 2013). … Txawm li cas los xij, lub xub ntiag ntawm interxylary phloem yog qee zaum tsis tshua muaj tshwm sim thiab tsuas tuaj yeem lees paub los ntawm microscopy.
Ntawm twg ntawm cov nroj tsuag hauv qab no Interxylary phloem thaj ua rau thaj yog tsim?
Interxylary phloem sawv cev rau cov hlua ntawm cov hlab ntsha nrog rau cov parenchyma hlwb ua cov Islands tuaj uas tau muab tso rau hauv cov xylem theem nrab ntawm qia thiab cov hauv paus hniav. Feem ntau xws li interxylary phloem yog tsim nyob rau hauv cov nroj tsuag uas muaj ib lub nplhaib ntawm vascular cambium (Carlquist 2013).
xylem thiab phloem nyob qhov twg?
In stems and roots, lub xylem feem ntau nyob ze rau sab hauv ntawm qia nrog phloem rau sab nrauv ntawm qia. Nyob rau hauv stems ntawm ib co Asterales dicots, tej zaum yuav muaj phloem nyob rau hauv sab hauv ntawm lub xylem ib yam nkaus thiab. Nruab nrab ntawm xylem thiab phloem yog meristem hu ua vascular cambium.
Puas phloem muaj nyob hauv nplooj?
Phloem, tseem hu ua bast, cov ntaub so ntswg hauv cov nroj tsuag uas coj cov khoom noj hauv nploojrau txhua qhov chawntawm tsob ntoo. Phloem yog tsim los ntawm ntau lub hlwb tshwj xeeb hu ua sieve tubes, cov hlwb ua ke, phloem fibers, thiab phloem parenchyma cells.