Şeftali ağacında yaprak büyümesi sırasında yaprak hücre fizyolojisi ve klorofil biyosentezindeki değişiklikler

Öz

Şeftali ağacında yaprak büyümesinin yaprak hücre fizyolojisi ve klorofil biyosentezi üzerindeki etkileri değerlendirilmiştir. Garnem üzerine aşılı Rich May şeftali çeşidinin büyümekte olan yaprakları (genç yapraklar) ve büyüyen yaprakları (yaşlı yapraklar) karşılaştırılmıştır. Yaprak büyümesi ile ilgili parametreler Mayıs ayı sonunda değerlendirilmiştir. Büyümüş yapraklarda stoma iletkenliği artarken yaprak sıcaklığı düşmüştür. Stoma iletkenliğindeki farkın stoma sayısından ziyade stoma büyüklüğü ile ilişkili olduğu görülmüştür. Proto IX, Mg-Proto IX ve Pchlide dahil olmak üzere klorofil öncüllerinin konsantrasyonları yaprak büyümesi sırasında artmıştır. Yaprak büyümesi sırasında kortikal hücre bölünmesi ve genişlemesi artmıştır. Ayrıca, yaprak büyümesi sırasında ksilem boyutu ve sayısı önemli ölçüde artmıştır. Şeftalide hücre genişlemesinin yaprak boyutu üzerinde önemli bir etkisi olmuştur.

Anahtar Kelimeler

• Cortical cell
• leaf age
• peach
• xylem

Alterations in leaf cellular physiology and chlorophyll biosynthesis during leaf expansion in peach tree

Öz

The effects of leaf expansion on leaf cell physiology and chlorophyll biosynthesis were evaluated in peach tree. The expanding leaves (young leaves) and the expanded leaves (old leaves) of Rich May peach cultivar grafted onto Garnem were compared. The parameters related to leaf expansion were evaluated end of May. Stomatal conductance increased in expanded leaves, while leaf temperature decreased. The difference in stomatal conductance appeared to be associated with stomata size rather than stomata number. The concentrations of chlorophyll precursors including Proto IX, Mg-Proto IX and Pchlide increased during leaf expansion. Cortical cell division and expansion increased during leaf expansion. Furthermore, xylem size and number significantly increased during leaf expansion. Cell expansion had a major influence on leaf size in peach.

Anahtar Kelimeler

• Cortical cell
• leaf age
• peach
• xylem

Kaynakça

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