EXAMINATION OF GAS EXCHANGE PARAMETERS OF Abies balsamea (L) MILL. AND Abies concolor SAPLINGS, GROWN UNDER VARIOUS WATER REGIME, EXPOSED TO EXTREME DROUGHT STRESS AT THE END OF THE GROWING SEASON

Year 2021, Volume: 5 Issue: 2, 592 - 605, 31.10.2021

İsmail Koç

https://doi.org/10.32328/turkjforsci.990037

Cited By: 5

Abstract

Two-year-old (plug+1) containerized Abies balsamea (L) Mill. and Abies concolor saplings were grown under various irrigation in the greenhouse to examine gas exchange parameters end of the growing period when they were exposed to extreme drought stress. Relative height growth (RHG) and relative root collar diameter (RRCD) were measured next to gas exchange parameters, such as net photosynthetic rate (Anet), stomatal conductance (gs), transpiration rate (E), intrinsic water use efficiency (iWUE=Anet/gs), and water use efficiency (WUE=Anet/E). As a result, Abies balsamea saplings had a higher RHG and RRCD than Abies concolor. Species had a significant effect on leaf gas exchange parameters that Abies balsamea had a higher Anet, gs, and a lower iWUE than Abies concolor. Increasing irrigation increased Anet and E. The interaction of species and time was statistically significant for gs and iWUE measurement. İncreasing prolonged drought decreased gs and did not change iWUE values for Abies balsamea, while increased gs and reduced iWUE for Abies concolor saplings. Even though Anet, E, and WUE were not statistically significant under the interaction of species and time, there is a decreasing trend for Abies balsamea on these parameters. In contrast, Abies concolor had a decreasing trend on Anet, and WUE and an increasing trend for gs when the saplings were exposed to extreme drought or extended the dehydration period were observed. Abies balsamea had a better performance and drought tolerance than Abies concolor when exposed to a prolonged drought.

Keywords

Abies balsamea, Abies concolor, net photosynthetic rate, stomatal conductance, water use efficiency

ÇEŞİTLİ SULAMA REJİMLERİNDE YETİŞTİRİLEN Abies balsamea VE Abies concolor FİDANLARININ BÜYÜME DÖNEMİ SONUNDA AŞIRI KURAKLIK STRESİ ALTINDAKİ GAZ DEĞİŞİM PARAMETRELERİ

Abstract

Sera ortamında farklı sulama rejimleri altında yetiştirilen iki yaşında (plug+1) tüplü Abies balsamea ve Abies concolor fidanlarının büyüme dönemi sonundaki aşırı kuraklık stresine maruz bırakılmaları durumundaki gaz alışveriş parametreleri incelenmiştir. Net fotosentez (Anet), stoma iletkenliği (gs), terleme oranı (E), içsel (gerçek) su kullanım etkinliği (iWUE=Anet/gs) ve anlık bitki su kullanım etkinliği (WUE=Anet/E) yanında göreceli boy büyümesi (RHG) ve çap artımı (RRCD) ölçülmüştür. Sonuç olarak A. balsamea fidanları A. concolor göre daha fazla RHG ve RRCD büyümesi yapmıştır. Yaprak gaz alışveriş parametreleri üzerinde türlerin önemli bir etkisi olup, A. balsamea A. concolor göre daha yüksek Anet, gs ve daha düşük iWUE değerlerine sahiptir. Artan sulama Anet ve E’yi artırmıştır. Tür ve ölçüm zamanı etkileşimi, gs ve iWUE değerleri üzerinde istatistiksel olarak anlamlı çıkmıştır. Kuraklık periyodunun uzaması A. balsamea fidanlarının gs değerlerini düşürmüş ve iWUE değerleri değiştirmezken, A. concolor fidanlarında gs’yi artırmış ve iWUE değerini düşürmüştür. Tür ve ölçüm zamanı etkileşimi altında Anet, gs ve WUE istatistiksel olarak anlamlı olmasa da bu parametreler A. balsamea fidanlarında azalma eğilimi göstermiştir. Aksine, fidanlar aşırı kuraklık stresine maruz kaldığında veya susuz dönem uzadığında, A. concolor fidanlarının Anet ve WUE değerlerinde bir azalan ve gs değerlerinde artan bir eğilim gözlemlenmiştir. A. balsamea uzun kuraklık dönemine maruz kaldığında A. concolor’a göre daha iyi bir performansa ve kuraklık toleransına sahiptir.

Keywords

Abies balsamea, Abies concolor, net fotosentez, stoma iletkenliği, su kullanım verimliliği.

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