(1) Allium cepa is known only in cultivation, but related wild species occur in Central Asia.

(2) We usually use allium cepa root tip, as experimental material to observe the plant cell mitosis.

(3) Allium fistulosum; Allium cepa; tubular shaped leaf; programmed cell death.

(4) Allium cepa is also known as the 'garden onion' or 'bulb' onion and 'shallot'.

(5) Onion (Allium cepa L) is an important flavoring that commands universal application as seasonings with vegetables in East daily diet.

(6) Effects of abscisic acid ( ABA ) treatment on onion ( Allium cepa ) dormancy were studied.

(7) The nuclei were isolated from the root meristematic cells of Allium cepa and the nuclear matrices were prepared.