MERISTEMA

MERISTEMA (az yun. meristos — taqsimshavanda), boftai hujayra ofar, chunon boftai rastaniro guyand, ki qobiliyati taqsim va ofarinishi hujayrahoi navro muddati madid tamin mekunad. Baze hujayraho dar ovoni embrionii inkishof bozdoshta meshavand va zimni taqsimshavi sabzishi muntazami rastaniro tamin menamoyand. Digar hujayrahoi Meristema boshand, tadrijan differensiasiya shuda, boftahoi gunoguni doimi (beruni, mekhaniki, asosi va g.)-ro ba vujud meorand. Meristema az protomeristemahoi janin, ki dar Meristemai boloi (apikali) va pahlui (laterali) inkishof meyoband, hosil meshavad. Meristemai boloi (qonusi sabzisherhoi sabzishi navda va resha) dar janin khele barvaqt mushohida meshavad. Ba vujud omadani tukhmpalla va sipas dar qonusi sabzishi navda paydo shudani maniyu» barg differensiasiyai Meristemai pahlui (prokambiy va kambiy)-ro ba vujud meorand. Dar prosessi sabzishi rastani boftai meristemi qisman dar baze qismhoi rastani (mas., dar resha, bandu navda, poya va g.) boqi memonad. hujayrahoi Meristema nisbatan khurd buda, bo shakl, faoliyati balandi metaboli va g. az hujayrai boftahoi digar farq mekunand.