Altıncı Grup Bitki Hormonu: Brassinosteroidler

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Anahtar Kelimeler

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ALTINCI GRUP BİTKİ HORMONU: BRASSİNOSTEROİDLER - SIXTH CLASS OF PLANT HORMONES: BRASSINOSTEROIDS

Öz

ALTINCI GRUP BİTKİ HORMONU: BRASSİNOSTEROİDLER

Bitki steroidleri, böcek, hayvan ve insan steroid hormonları ile yapısal benzerlik gösteren 70’ten fazla bileşiği kapsamaktadır. Yeni bir bitki hormon sınıfı olan brassinosteroidler (BR’ler), bitkilerde sıklıkla rastlanan bitki steroidlerinin spesifik bir grubudur. BR’lerin çok düşük konsantrasyonlarda, hücre bölünmesi, uzaması ve genişlemesi, fotomorfogenezis, reproduktif organlarda gelişim, yaprak senesensi, toplam biyokütle ve verim artışı gibi bitki büyüme ve gelişmesinde düzenleyici görevlerinin yanı sıra çevresel streslere adaptasyonda da etkili oldukları tespit edilmiştir. Bu derlemede, özellikle son yıllarda yapılmış olan, brassinosteroidlerin fizyolojik fonksiyonları, BR sinyal iletim modeli, BR biyosentezi, BR’ler tarafından uyarılan genler ve BR mutantları ile ilgili araştırma bulguları hakkında bilgiler verilmiştir.

SIXTH CLASS OF PLANT HORMONES: BRASSINOSTEROIDS

Plant steroids include more than 70 compounds structurally similar to insect, animal and human steroid hormones. Brassinosteroids (BRs), a new class of plant hormones are frequently encountered in the plants and belong to a specific group of steroids. It has been found that BRs at very low concentrations are effective in cell division, elongation and expansion, photo-morphogenesis, development of reproductive organs, leaf senescence, the increase in total biomass and yield as well as regulatory functions such as growth and development of plant adaptation to environmental stresses. In this review, especially covering the recent years, the results obtained from the studies regarding the physiological functions of BRs, BR transduction pathway, BR biosynthesis, the genes induced by BRs and BR mutants are presented.

Anahtar Kelimeler

• Brassinosteroidler, fizyolojik etkiler, sinyal iletimi ve biyosentezi, BR mutantları, abiyotik stres

Kaynakça

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45. Geliş Tarihi: 16.04.2012 Kabul Tarihi: 18.06.2012