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سه شنبه 31 خرداد 1390 :: نویسنده : علیرضا

انواع چرخه زندگی در قارچ ها :

سه نوع زندگی در قارچ ها دیده می شود :

1: چرخه هاپلوبیونتیک هاپلوئید : در این چرخه میوز درزیگوت انجام می شود و اسپورهای هاپلوئید بوجود می آیند که تولید میسلیوم های هاپلوئید می کنند و قارچ در تمام مراحل رشد رویشی خود هاپلوئید است. این چرخه در بیشتر آسکومیست ها و زیگومیست ها دیده میشود.

2: چرخه هاپلوبیونتیک دیپلوئید :در این چرخه میوز گامتانژی است و لذا از تندش سلول تخم میسلیوم های دیپلوئید بوجود می آیند و قارچ در همه مراحل رویشی خود دیپلوئید است. این حالت در اامیست ها دیده می شود.

3: چرخه دیپلوبیونتیک : دراین حالت قارچ در دوره زندگی رویشی خود دو نوع ریسه ، هاپلوئید و دیپلوئید دارد. از تندش زیگوت ، میسلیوم های دیپلوئید بوجود می آیند.

این میسلیوم ها تولید گامتانژهایی می کنند که میوز در آنها اتفاق می افتد و گامت های نر و ماده ، هاپلوئید تولید می شوند.

گامت ها جوانه زده و میسلیوم های هاپلوئید بوجود می آورند. این میسلیوم ها به روش میتوز گامت های نر و ماده بوجود می آورند که از آمیزش آنها سلول تخم ( زیگوت ) دیپلوئید ایجاد می شوند.

چرخه دیپلوبیونتیک در قارچ های جنس Allomyces از راسته Blastocladiales دیده میشود





نوع مطلب : قارچ ها، 
برچسب ها : چرخه هاپلوبیونتیک هاپلوئید، چرخه هاپلوبیونتیک دیپلوئید، چرخه دیپلوبیونتیک، جنس Allomyces، راسته Blastocladiales،
لینک های مرتبط :


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