Mısır fidelerinin büyüme ve gelişmesi üzerine progesteronun doğrudan etkisi

Year 2019, Volume: 8 Issue: 2, 396 - 405, 28.06.2019

Hülya Türk

https://doi.org/10.17798/bitlisfen.473607

Cited By: 1

Abstract

Memeli cinsiyet
hormonları arasında yer alan ve bitkilerde de doğal olarak bulunan progesteron,
çimlenmeden çiçeklenmeye kadar tüm bitki gelişim safhaları üzerine önemli
uyarıcı etkilere sahiptir. Ancak bu hormonun etki mekanizması halen tam olarak
aydınlatılamadığı gibi, sebep olduğu etkilerin de direkt olarak kendinden mi
kaynaklandığı yoksa farklı yolaklar üzerinden dolaylı olarak mı gerçekleştiği
halen bilinmemektedir. Bu amaçla, mevcut araştırmada progesteron reseptör
antagonisti olan mifepriston kullanılmak suretiyle, progesteronun etkisinin
doğrudan mı yoksa dolaylı mı olduğu belirlenmeye çalışılmıştır. 9 günlük mısır
fideleri 4 gruba ayrılarak yapraklarına saf su (kontrol grubu), progesteron
(0.1 µmol.L^-1), mifepriston (5.8×10^-5
mmol.L^-1) ve progesteron + mifepriston) solüsyonları
püskürtülmüş ve tüm gruplar üç gün sonra hasat edilerek çeşitli analizler
yapılmıştır. Progesteron uygulaması bitkilerin kök ve yaprak uzunluları ile
total klorofil ve kuru madde içeriklerinde kontrol bitkilerine kıyasla önemli
artışlara sebep olurken, mifepriston uygulanan bitkilerde bu parametrelerin
tamamında belirgin düşüşler kaydedildi. Progesteron ile birlikte mifepriston
uygulanan bitkilerde ise kontrol bitkilerine kıyasla istatistiki olarak önemli
bir değişim meydana gelmedi. Tek başına mifepriston uygulaması ise bu
parametrelerde belirgin bir inhibisyona neden oldu. Tüm bu bulgular,
mifepriston uygulamasının progesteronun bağlanmasını önlemek suretiyle
progesteron bağlantılı metabolik faaliyetlerin gerçekleşmesine ket vurarak
mısır fidelerinin büyüme ve gelişmesini inhibe ettiğini ve böylelikle
progesteronun bitki metabolizması üzerine doğrudan etkiye sahip olduğunu açıkça
ortaya koymaktadır.

Keywords

progesteron, mifepriston, mısır, bitki büyümesi

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