Impacts of precommercial thinning on gas exchange, midday water potential, and chlorophyll content in Pinus nigra subsp. pallasiana stand from the semiarid region

Bayar, Esra; Deligöz, Ayşe

doi:10.1007/s00468-020-01989-6

Cited by 5 publications

(2 citation statements)

References 45 publications

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“…The present study in line with the previous study that gs is often used as an indicator to measure the level of water stress that the increasing water stress reduces declined the gs rates [41]. In periods when there is less water in the soil, water potential decreases in plants, which causes a decrease in Anet due to the decrease in stomatal conductivity [42]. Decreasing E helps maintain the cell turgor, which is called an acclimation response to water stress [43].…”

Section: B Relationships Between Gas Exchanges Parameters and Water Stresssupporting

confidence: 88%

Examining Seed Germination Rate and Seedlings Gas Exchange Performances of Some Turkish Red Pine Provenances Under Water Stress

Koç

2021

Düzce Üniversitesi Bilim Ve Teknoloji Dergisi

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With climate change, global warming has increased adverse effects on living things in our country. In these adverse effects, water scarcity is the most crucial problem due to the increase in temperature and decrease in precipitation. Forests are the most affected ecosystem among others by water scarcity in our country. This study tried to determine the 5-year-old seeds and 1-year-old seedlings (produced from the same seeds) of some Turkish red pine provenance' responses to different water stress levels. First, how the water stress levels (0, -0.2, -0.4, -0.6, -0.8 MPa) affect seed germination of these provenances was determined. Secondly, gas exchange parameters [net photosynthesis (Anet), stomatal conductance (gs), transpiration (E), and intrinsic water use efficiency (iWUE)] under different water stress were determined in the seedlings obtained from these species' seeds. As a result of the germination test, Denizli-Çameli (DC) provenance had the highest rate (48%), while Maraş-Suçatı had the lowest rate (29%) under control treatment. The highest germination rate was obtained in Burdur/Bucak provenance (5%) under -0.2 MPa osmotic potential. For gas exchange parameters, Antalya/Gündoğmuş provenance had the highest Anet, gs values while DC provenance had the lowest Anet, gs, and E values when provenance is considered as a single factor. Besides, increasing in irrigation increased Anet, gs, and E while decreased the iWUE. The lowest seedling E under water stress can be explained because this species responds to the water shortage by closing its stomata. Among the Turkish red pine origins, DC provenance showed higher drought tolerance than others.

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Section: B Relationships Between Gas Exchanges Parameters and Water Stresssupporting

confidence: 88%

Examining Seed Germination Rate and Seedlings Gas Exchange Performances of Some Turkish Red Pine Provenances Under Water Stress

Koç

2021

Düzce Üniversitesi Bilim Ve Teknoloji Dergisi

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“…Gas exchange measurements are relatively easy to obtain in seedlings because leaves are easily accessible compared to mature trees (Gauthier and Jacobs, 2018). However, for tall trees, in situ measurements usually require building up a permanent or a mobile elevated platform such as a ladder, a lift, or a scaffold to ensure that the portable photosynthesis measurement system remains stable during the measurement (Loewenstein and Pallardy, 1998;Gauthier and Jacobs, 2010;Gauthier and Jacobs, 2018;Bayar and Deligöz, 2020;Akalusi et al, 2021). It is difficult to carry an elevated mobile platform, especially in forest areas with steep slopes, rough or rocky terrain, or when branches that allow measurement exceed the platform's maximum height.…”

Section: Introductionmentioning

confidence: 99%

A comparison of photosynthetic gas exchange parameters measured under in situ and in vitro conditions in Pinus nigra subsp. pallasiana and Pinus brutia trees

Bayar,

Özçelik

2024

Turkish Journal of Forestry | Türkiye Ormancılık Dergisi

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This study was conducted to compare the results of in situ and in vitro methods that can be used for measuring gas exchange parameters in two pine species. The study was carried out in a mixed Pinus nigra Arn. subsp. pallasiana (Lamb). Holmboe and Pinus brutia Ten. plantation in Kemer/Burdur, which has a semi-arid climate type located in the Western Mediterranean Region of Türkiye. In the first method, gas exchange parameters (net photosynthetic rate-Anet, stomatal conductance-gs and transpiration rate-E) were measured directly on the tree using a mobile scaffold to reach to the tree canopy (in situ conditions). In the second method, branches were cut at approximately 50 cm and gas exchange parameters were determined in the same needles after the branch was immediately submerged in water (in vitro conditions). Measurements were taken between June and October 2022. Student’s t-test was conducted to compare the results of in situ and in vitro photosynthesis measurement methods. No statistically significant differences were found between the results of the compared methods in terms of gas exchange parameters for both species. The results of the study showed that in vitro measurements of photosynthesis can be preferred to in situ measurements of photosynthesis in P. nigra and P. brutia under field conditions where access to the canopy of tall trees is not possible.

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Effects of thinning and understory removal on water use efficiency of Pinus massoniana: evidence from photosynthetic capacity and stable carbon isotope analyses

Wang,

Xu,

Zhang

et al. 2024

J. For. Res.

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Impacts of precommercial thinning on gas exchange, midday water potential, and chlorophyll content in Pinus nigra subsp. pallasiana stand from the semiarid region

Cited by 5 publications

References 45 publications

Examining Seed Germination Rate and Seedlings Gas Exchange Performances of Some Turkish Red Pine Provenances Under Water Stress

Examining Seed Germination Rate and Seedlings Gas Exchange Performances of Some Turkish Red Pine Provenances Under Water Stress

A comparison of photosynthetic gas exchange parameters measured under in situ and in vitro conditions in Pinus nigra subsp. pallasiana and Pinus brutia trees

Effects of thinning and understory removal on water use efficiency of Pinus massoniana: evidence from photosynthetic capacity and stable carbon isotope analyses

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