Leaf Senescence: A View of Its Physiological and Molecular Regulation

Abstract

Studies related to senescence, which is an important developmental process in plants and leads to death of a cell, tissue or whole plant, is based on the end of the 1800s. The preliminary studies were at observational level but they were replaced by comprehensive biotechnological research in conjunction with the development of technology and genetic science. The scientists in various part of the world have carried out experiments related to elucidation of the genetic mechanism of senescence. Leaf senescence is one of the most studied types occurred in leaf and characterized by loss of chlorophyll. Elucidation of the mechanism of senescence will provide great economic benefits in improving product quality and extending the shelf life of vegetables such as parsley, broccoli, spinach and fruit such as tomato, apple and ornamental plants such as carnation, alstroemeria, petunia. In this review, regulatory mechanisms of leaf senescence were discussed

Keywords

• Leaf senescence
• loss of chlorophyll
• genetic mechanism
• physiological regulation

Yaprak Senesensi: Fizyolojik ve Moleküler Düzenlenmesine Bakış

Abstract

Bitkilerde görülen, tüm bitki, organ, doku ya da hücre ölümü ile sonuçlanan önemli bir gelişme süreci olan senesens ile ilgili çalışmalar 1800’lü yılların sonlarına dayanmaktadır. İlk yıllarda gözlemlerden oluşan bu çalışmalar günümüzde teknolojinin ve genetik biliminin gelişmesiyle yerini kapsamlı biyoteknolojik araştırmalara bırakmıştır. Dünyanın çeşitli yerlerindeki araştırma merkezlerinde bilim adamları senesensin genetik mekanizmasının aydınlatılması ile ilgili deneyler yapmaktadırlar. Üzerinde en çok araştırma yapılan senesens çeşidi yapraklarda görülen ve klorofil kaybı ile karakterize edilen yaprak senesensidir. Senesens mekanizmasının aydınlatılması ekonomik düzeyde ürün kalitesinin artırılmasında, maydanoz, brokoli, ıspanak gibi sebze, meyve ve süs bitkilerinin raf ömrünün uzatılmasında büyük yararlar sağlayacaktır. Bu derlemede yaprak senesensinin düzenlenme mekanizmaları anlatılmıştır.

Keywords

• Yaprak senesensi
• klorofil kaybı
• genetik mekanizma
• fizyolojik düzenlenme

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