Shekara-shekara zobba - shi cambium? Structure fukntsii

Cambium - a masana'anta, wanda ya ta'allaka ne tsakanin itace da phloem. Inda ya fito? Yana taso daga procambium - jijiyoyin bugun gini daure. Samu a cikin mai tushe, da tushen da shuke-shuke.

Da farko, da cambium na shuke-shuke samu kawai a cikin jijiyoyin bugun gini daure. Wannan irin aka kira wani sheaf. Sa'an nan, da nama Forms Layer na medullary haskoki, shirya tsakanin bim. Wannan irin katako ne da ake kira cambium.

A yadudduka samar da wani fili cambium katako, forming guda-Layer zobe. Tare da ci gaban da tsire-tsire samar da sabuwar katakanta da axial gabobin fara girma a kauri, forming sabon yadudduka na itace. Wannan shi ne babban aikin da cambium. Irreplaceable.

A cikin hunturu cambium barci, don haka ci gaban da tsire-tsire a cikin kauri a lokacin sanyi ba ya faruwa. Saboda da canje-canje faruwa a cikin akwati na shuka da kuma tsawon dormancy a cikin hunturu shekara-shekara zobba suna kafa.

Aiki, tsarin

Cambium - wannan shi ne wani muhimmin masana'anta, ba tare da wanda ci gaban da itacen da yake a kauri ne ba zai yiwu. Its Kwayoyin - prozenhimnye. Bã su da wani elongated siffar da bevelled iyakar. Prozenhimnyh tsawon wuce da nisa daga cikin cell sau da yawa. A tsaye giciye-bangaranci rectangular siffar da aka kiyaye.

Cambium - ne Kwayoyin cewa suna da wani hadadden tsarin. Suna located ciki da tsakiya, cytoplasm da wasu gabbansa. Abin mamaki shi ne cewa jinkirin ƙungiyoyi da faruwa a cikin cytoplasm. The gudun dogara a kan kakar. A tsakiyar ɓangare na tantanin halitta shine tsakiya. An halin wani elongated siffar. A Kwayoyin iya ci shuka adana gina jiki. Sun shigar da cell jini.

division

A na gaba lokaci. Cambium - a cell iya rarraba. A tsari ne saboda da cytoplasm.

cambium Kwayoyin suna iya raba kawai iyakacin duniya. A gefe daya - samar da wata katako, da kuma a kan sauran - haushi da shuka. A bukatarsa fission auku disproportionately. Saboda haka, itace haushi ƙunshi kasa da itace. Idan cell division tafi proportionally, bayan rarraba haushi da kuma itace zai zama a cikin wannan adadin.

A lokacin da rabo daga daya cell raba zuwa biyu. Sai ɗaya daga cikin sabon abubuwa zama da iyaye cell, da sauran - a sake raba a rabin fuskanta a cikin phloem ko itace. A karshe mika mulki dogara a kan abin da na shuka m divisible Kwayoyin.

A lokacin da rabo daga cikin itace da aka ajiye zuwa tsakiyar na reshe. A toshe kwalaba - to gefen.

aiki

Yanzu wasu daga cikin yiwuwa. Located in kara cambium aikin wani ilimi aiki. Wannan damar da aka samu daga na musamman tsarin da Layer. Ya yiwu a sauya Kwayoyin tare da bakin ciki bawo iya raba da kuma girma. Godiya ga wannan kara shuka thickens.

shekara-shekara zobba

Kowa ya sani cewa da itatuwa da shekara-shekara zobba. A su za ka iya sanin yadda shekaru masu yawa da shuka. A lokacin daya shekara da'irar kafa, watau. E. Annual zobe. An kafa cambium wanda ya samar da da fission kara girma a kauri.

Bishiyoyi girma a cikin temperate sauyin yanayi, da rabo daga ta Kwayoyin fara a farkon spring kuma ƙare a cikin fall. Ta tashi mai gidan, da itãciya fara girma rayayye. A wannan lokaci, da cambium yana da manyan Kwayoyin, wanda ta karshen lokacin rani zama kunkuntar, amma tare da wani lokacin farin ciki da harsashi. A sakamakon da rabo ne da samuwar na shekara-shekara da zobe. Ta hanyar da kauri za a iya hukunci a kan ci gaban da katako a kowace shekara. Kowane shekara-shekara zobe kunshi rani da kuma hunturu Layer. Suna bambanta da launi: mai haske - wannan lokacin rani, da kuma duhu - hunturu.

Lokacin da rarraba cambium Kwayoyin samar da itace da haushi. A farko ya yi aikin aiki na Stocking up da haushi - m. Wadannan sassa na shuka ake yi daga wasu iri Kwayoyin. A lokacin da girma kakar kowane kashi cika ta musamman rawa wajen ci gaban na shuka.

A takaice, da cambium ne mai muhimmanci shuka nama. su kawai ba zai wanzu ba tare da shi.