TUZ STRESİ (NaCl) ALTINDA ÇİMLENDİRİLEN ARPA TOHUMLARININ MİTOTİK İNDEKS VE KROMOZOM ANORMALLİKLERİ ÜZERİNE BAZI BİTKİ BÜYÜME DÜZENLEYİCİSİ KOMBİNASYONLARININ ETKİLERİ

Year 2008, Volume: 3 Issue: 2, 162 - 173, 01.12.2008

Kıymet Demir Selma Tabur

Abstract

Bu çalışmada tuz stresi altında çimlendirilen arpa tohumlarının (Hordeum vulgare L.
var. Bülbül 89) mitotik indeks ve kromozom anormallikleri üzerine gibberellik asit (GA3),
kinetin (Kin), benziladenin (BA), 24-epibrassinolid (EBR), etilen (E) ve poliamilerin
(kadaverin-Kad, putressin-Put, spermidin-Spd, spemin-Spm) ikili, üçlü ve dörtlü
kombinasyonlarının etkileri araştırılmıştır. Tuz konsantrasyonunun artışına paralel olarak
mitotik aktivite önemli ölçüde azalmış ve kromozom anormallik yüzdesi artmıştır. Çalışılan
büyüme düzenleyicisi kombinasyonlarının büyük bir çoğunluğu yüksek tuz
konsantrasyonlarında mitotik aktivitesi üzerinde olumlu bir etki göstermiştir. Ayrıca bu
büyüme düzenleyicilerinin büyük bir çoğunluğu tüm tuz seviyelerinde kromozom anormallik
yüzdesi üzerindeki olumsuz etkiyi önemli ölçüde hafifletmiştir. Sonuç olarak, söz konusu
bitki büyüme düzenleyicisi kombinasyonlarının arpa tohumlarının mitotik indeks ve
kromozom anormallikleri üzerinde farklı derecelerde etkili oldukları ve bu farkın istatistiksel
açıdan önemli olduğu tespit edilmiştir.

Keywords

Arpa, bitki büyüme düzenleyicisi, kromozom anormallikleri, mitotik indeks, tuz stresi

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