Acacia mellifera ve Acacia laeta Fidanlarinda Kurak Toprakta Diurnal Fotosistem II Fotokimyasal Verim ve Biyokütle Bölümlenmesi

Yıl 2019, Cilt: 19 Sayı: 1, 82 - 94, 27.03.2019

Abubakr M.j. Sıam İbrahim H. Abdalkreem

https://doi.org/10.17475/kastorman.543538

Öz

Çalışmanın amacı: Çalışmada, kurak toprağın fotosistem II'nin diürnal fotokimyasal etkinliği üzerindeki etkisi ve Acaia mellifera (Mf) ve Acacia laeta (Lt) fidanlarının biyokütle bölümlenmesinin değerlendirilmesi amaçlanmıştır.

Çalışma alanı: Araştırma, Sudan'ın Kuzey Darfur Eyaletinde, Al Fashir Üniversitesi Orman ve Çevre Bilimleri Fakültesi, Çevre Bilimleri ve Doğal Kaynaklar Fakültesinde yürütülmüştür.

Materyal ve yöntemler: Her bir tür için iki aylık 30 adet fidan çalışma için seçildi. Tür başına fidanların yarısı iyice sulandı, ve diğer yarısı tam kuraklığa maruz kalmadan önce beş farklı kuraklık derecesine maruz bırakılmıştır.

Sonuçlar: Klorofil flüoresans çalışmasının sonuçları, her iki türün ölçümler boyunca fotosentez mekanizmalarını koruyabildiğini göstermiştir. Mf, kontrol fidelerinde Lt'ye kıyasla daha yüksek biyokütle üretimi gösterdi. Diğer taraftan, tekrarlanan kuraklık döngü teknikleri muhtemelen Lt’nin büyüme ve gelişmesini arttırmıştır. ΔF/Fm ve photosynthetically aktif radyasyon (PAR) arasında, ve Fv/Fm ve yaprak sıcaklığı (T) arasında kuvvetli negatif ilişki tespit edilmiştir.

Önemli vurgular: Kurak mevsimde genel olarak aralıklı sulama koşullarında A. mellifera, daha iyi bir büyüme gösterecektir, ve bu nedenle, A. laeta'ya göre yarı kurak ortamlarda canlı çit ve ağaçlandırma amacı için daha uygun olduğunu göstermiştir.

Anahtar Kelimeler

Klorofil flüoresan; kuru madde dağılımı; su stresi; Akasya mellifera; Akasya laeta

Diurnal Photosystem II Photochemical Efficiency and Biomass Partitioning in Acacia mellifera and Acacia laeta Seedlings Under Drying Soil

Öz

Aim of study: The study aimed to assess the impact of drying soil on diurnal photochemical efficiency of photosystem II and biomass partitioning of the seedlings of Acaia mellifera (Mf) and Acacia laeta (Lt).

Study area: The study was conducted at the nursery of Department of Forestry & Range Sciences, Faculty of Environmental Sciences and Natural Resources, University of Al Fashir, North Darfur, Sudan.

Materials and methods: Thirty-six seedlings of two-months old per each species were selected for study. A half of seedlings per species was kept well-watered and the other was exposed to five drought cycles before exposed to continuous drying.

Main results: The results of chlorophyll fluorescence study were indicated that both species are capable to maintain sound photosynthetic machinery throughout the course of measurements. Mf manifested higher biomass production compared to Lt in control seedlings. Conversely, repeated drying cycles techniques were likely improved growth and production in Lt. Strong negative relationships were established between ΔF/Fm' and incident photosynthetically active radiation (PAR), and between Fv/Fm and leaf temperature (T).

Highlights: Under the intermittent irrigation conditions during dry season in general A. mellifera would show better growth hence greater potentials for live fence and afforestation purposes in semi-arid environments compared to A. laeta.

Anahtar Kelimeler

Chlorophyll fluorescence, Dry matter allocation, Water stress, Acacia mellifera, Acacia laeta

Kaynakça

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