Abụọ njikọta

Pollen mkpụrụ na-ada na ihere nke otu ụzọ ma ọ bụ ọzọ, na-amalite asiaha. Ọka tọrọ, pollen tube a kpụrụ si vegetative mkpụrụ ndụ. N'ihi ya, Germination amalite. Shei etịbede na thinnest ebe nke pollen tube. Site n'ọnụ nke tube ekenyela pụrụ iche bekee. Ha nro akwa kọlụm na ihere.

The isi nke ịmụ ọmụmụ na vegetative mkpụrụ ndụ rue n'ime pollen tube. Ịmụ ọmụmụ cell abahade na Nleta abụọ spam. Site micropyle (a onu ke shei) ovule pollen tube na-penetrated n'ime ẹmbrayo nwa. Inside akpa tube na-agbajikwa na ọdịnaya wụkwasịrị.

Mgbe anọ na-adị na ọbara ọcha si n'ahụ otu egg. N'ihi ya, a zaigọtụ, ekemende enye mbido nkpuru nwa. Ọnụ na nke abụọ a jikọrọ ọnụ na Central isi nke spam. Nke a na-eduga ná guzobe triploid ntọala inyefe mgbe e mesịrị na triploid endosperm, nke bụ nke abụọ.

All n'elu usoro a na-akpọ a "abụọ njikọta na okooko osisi."

Antipodes na synergids (pola nuclei na ẹmbrayo nwa) mgbe ẹkụre usoro na-etisasịwo, na integuments (veils) etolite nkpuru uwe.

Ugboro abụọ njikọta na osisi chọpụtara site Russian ọkà mmụta sayensị S. Navashin.

N'oge usoro a, ntọala na-amalite amalite nwa bụ n'ozuzu ọtụtụ ibu karịa ndị spam ntọala, nke e mere site na-achọta nke mbụ interphase (etiti adọ). Na ọnọdụ a na udi nke nuclei nke ẹmbrayo na nwa nwere ike ịdị iche iche. Ihe atụ, ụfọdụ Asteraceae ha nwere ike elongated, mgbe ụfọdụ, tortuous, na-abụghị nucleoli. N'ozuzu, spam na-ọkọnọ n'ụdị ahazi interphase nuclei na nucleoli, mgbe ụfọdụ, ndị na-enweghị iche na Ọdịdị nke ahụ nwaanyị nuclei.

Ugboro abụọ njikọta spam nwere ike ịbụ nke abụọ na ụdị, dabere na ọdịdị nke otu nke nwoke na nwaanyị nuclei.

N'ihi ya, mgbe usoro emee premitotic imikpu spam nuclei na nwanyi isi, ebe despiralization (unwinding) chromosomes. Na nke a n'otu tent ma chromosomes na interphase nuclei rụrụ.

Postmitotic abụọ Fertilization bụ ihe ntinye nke nwoke na nwaanyị nuclei, retaining shei na prophase, nke na-agwụ ha na-akpakọrịta. Education interphase nuclei, nke nwere chromosome tent, na-abịa mgbe a ga-nọrọ n'ụlọ mbụ mitotic nkewa zaigọtụ.

Mgbe abụọ njikọta pụtara na egg cell anọ na abụọ haploid (nwere ọkara ọnụ ọgụgụ nke chromosomes) cores, Otú ọ dị diploid zaigọtụ ntọala (na a zuru set nke chromosomes).

Dabere na ọnụ ọgụgụ nke pola nuclei ẹdude ke Central cell a kpụrụ chromosome nọmba nke endosperm nuclei.

Ugboro abụọ njikọta akwalite ngosi e ji mara na-enwe mmeri na endosperm nke osisi (ngwakọ) osisi endosperm si nna-ya. Na penetration nke ẹmbrayo na nwa ole na ole pollen akpa, usoro na-agụnye spam si akpa tube, na ndị ọzọ akpa spam mebiri emebi. Ugboro abụọ njikọta abụọ spermatozoa bụ nnọọ obere.

N'oge embryological ọtụtụ nnyocha iji nnọchiteanya nke dị iche iche angiosperms (Compositae, Ranunculaceae, Liliaceae) Navashin ngwa endosperm gosipụtara dị ka ẹmbrayo mmekọahụ usoro na okooko osisi. Nke a na onu bụ ihe e ji mara na nke na-anọchite anya nke angiosperms osisi.

Ọ ga-kwuru na ọrụ Navashin ekwe ka dokwuo anya ajụjụ nke mbido nke endosperm. The pụtara Nchoputa nke ọkà mmụta sayensị e ozokwa mepụtara.