Baklagillerde Kök, Nodül Oluşumu ve Azot Fiksasyonu Üzerine Bazı Küresel İklim Değişikliği Parametrelerinin Etkisi

Yıl 2018, Cilt: 4 Sayı: 2, 270 - 278, 30.12.2018

İlkay Yavaş Aydın Ünay

https://doi.org/10.24180/ijaws.366386

Cited By: 1

Öz

Küresel iklim değişikliği sürecinde atmosferdeki
karbondioksit ve sıcaklıktaki artışın kuraklık ve tuzluluğu artıracağı bir
gerçektir. Bu değişikliklerin özellikle kurak ve yarı-kurak iklimlerde
yetiştirilen baklagilleri olumsuz yönde etkileyeceği bildirilmiştir. Bu
derlemede özellikle bu olumsuzlukların kök-nodül oluşumu ve biyolojik azot
özümlemesi (BNF) üzerine olan etkileri tartışılmıştır. Baklagiller ve
bakteriler arasındaki simbiyotik ilişki artan CO₂ koşulları ile
birlikte artışı nodül gelişimini hızlandırmış ve BNF artışı görülmüştür. Buna
karşın iklim senaryolarına göre 2-4 ⁰C sıcaklık artışı ve
beraberinde kuraklığın kök tüyü infeksiyonunu, nodül sayısını, nodül
büyüklüğünü, nodül gelişimini ve aktivitesini azaltarak BNF’yi olumsuz
etkilediği saptanmıştır. Öte yandan tuzluluğun nodül solunumunu ve
leghemoglobin içeriğini azalttığı vurgulanmıştır. 

Anahtar Kelimeler

Baklagiller, CO2 artışı, kuraklık, sıcaklık, tuzluluk

Impact of Some Climate Change Parameters on Root, Nodule Formation and Nitrogen Fixation in Legumes

Öz

In the
context of global climate change, the increase in carbon dioxide and
temperature in the atmosphere is a fact that will increase drought and
salinity. These changes have been reported to adversely affect legumes grown
especially in arid and semi-arid climates. In this review, the effects of these
adverse events on root-nodule formation and biological nitrogen fixation (BNF)
are discussed. The symbiotic relationship between legumes and bacteria, together
with increased CO₂ conditions, accelerated nodule development and
increased BNF. However, according to climate scenarios, temperature increases
of 2-4 ° C with accompanying drought, decreased root hair infection, nodule
number, nodule size, nodule growth and activity and BNF was found to be
adversely affected. On the other hand, it was emphasized that salinity reduced
nodule respiration and leghemoglobin content.

Anahtar Kelimeler

Legumes, elevated CO2, drought, temperature, salinity

Kaynakça

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