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Obsabzhoi sabzi tudashakl (koloniyashakl)

YAke az namoyandai obsabzhoi tudagi, ki dar obhoi shirini obanborho va kulho vase pahn gardidaast volvoks meboshad. Volvoks kurashakl buda, rangash sabz ast. Har yak tuda andozaash (qutrash) az 0,5 to 1-3 mm buda, az 60-70 hazor hujayra iborat ast. In mikdori hujayraho yak qabatro hosil karda, ba tavri davragi joygir shudaand. Dokhili kura kovok buda, bo moddai luobi pur gardidaast.

obsabz

Har kadome az hujayraho dutogi qamchinak dorand, ki onho ba samti beruni kura nigaronida shudaand. In hujayraho az rui shaklashon ba khlamidomonada monand buda, nashviand va qobili af- zoish nestand. Onho vazifai jabbidtni ob va moddahoi gizoiro ichro mekunand. Dar dokhili volvoks, odatan, yakchandto tudachahoi khurdi dukhtari mavjudand, ki az hujayrai nisbatan kaloni modari hosil shudaand. Dar oqibati kor in tudahoi dukhtari devori hujay- rahoi modariro darronda, az on berun meshavand va ba zindagii mustaqilona shuru mekunand. Dar natija kurai modari nobud me- shavad. In holat hangomi afzoishi nashvi va gayrijinsi ba amal meoyad.

Afzoishi jinsii volvoks khususiyati ba khud khos dorad va az afzoishi chinsii khlamidomonada farq mekunad. Baze hujayrahoi tuda anteridiya (hujayrachahoi jinsii mardona) hosil mekunand, ki dar on nutfai duqamchinakdori zardrangi khurd ba vu- jud meoyad. Hujayrahoi digar ba oogoniyai kurashakli rangash sabzi siyohtob tabdil meyoband. Dar dokhili har kadom oogoniya (joe, ki khujayrahoi jinsii zanona inkishof meyoband) yaktoi tukhmhujayra mavjud ast. To davrai bordorshavi nutfaho az anteridiya ba ob baromada ba sui oogoniyaho harakat mekunand. Har yake az nutfaho ba oogonyya dokhil shuda, khujayratukhmro bordor mekunand. Dar natijai bordorshavi zigotai surkhrang ba vuchud meoyad, ki az berun bo qabati (pardai) gafs pushida shudaast. Pas az sipari gashtani davrai oromi (bahoron), zigota tadrijan taqsim shuda, dar natija gudai navi volvoks tashakkul meyobad.

Turchai obi shakli turkhaltai sarbastaro doshga, odatan dar obhoi sustjarayoni shirin, ki az moddahoi nitrogeni boy ast, zindagi mekunad. Andoza yo qutri on to 10-15 sm buda, bo chashmi oddi ba khubi dida meshavad. Devorkhoi turkhalta az hujayrahoi darozi si- lindrshakl, ki bo nughoyashon ba hamdigar chaspida, hujayrahoi panj-shash qirraro paydo kardaand, iboratand. Sitoplazma bo yadrohoi bisyorash dar nazdikii devori hujayra chod giriftaast. Dar kovokii hujayra vakuolahoi ziyodi sershirador va khromoto- fori turmonand mavchud ast ‘J.

Hangomi afzoishi gayrijinsi sitoplazmai hujayra taqsim shuda, zoosporahoi duqamchinakdori bisyor ba vuchud meoyand. Zoosporaho az khujayrai modari berun nashuda, dar dokhili on tudai navi turchai obiro hosil mekunand. Badi nobudshavii (daridani) pardai hujay- rai modari tudahoi javoni turchai obi ba berun mebaroyand. Onho khajman kalon shuda, shaklu andozaashon ba tudai modari monand meshavand.

Dar vaqti afzoishi jinsi az hujayrahoi tudachai turchai obi avvalo gametahoi duqamchinakdor ba vujud meoyand. Sipas, onho ba ob baromada, juft-juft payvast meshavand va zigotaro (hujayrai bordorshudaro) ba vujud meovarand. Zigota, ki az berun bo pardai gafs pushida shudaast, zimistonro dar holati oromi meguzaronad. Bahoron zigota ba taqsimshavi shuru karda, chorto zoosporai du- qamchinakdorro ba vujud meovarad. Az in zoosporaho bo rohi murakkab tudai navi turchai oby ba vujud meoyad.

  1. Sokhti volvoks chi guna ast?
  2. Volvoks az khlamidomonada bo chi farq mekunad?
  3. Volvoks chi tavr afzoish mekunad?
  4. Sokhti turchai obi chi guna ast?
  5. Turchai obi bo kadom rohho afzoish mekunad?
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