This study looks at the impact of climate change on the future distribution of Taxus baccata L.,a species under threat.It examines how altitudinal changes may influence distribution,projecting scenarios to 2100 using ...This study looks at the impact of climate change on the future distribution of Taxus baccata L.,a species under threat.It examines how altitudinal changes may influence distribution,projecting scenarios to 2100 using the SSPs 585 SSPs 245 scenarios in 20-year intervals.The results show a contraction in distribution in areas such as in Iceland and the United Kingdom,with certain extreme points disappearing.Simultaneously,new suitable areas are expected to emerge in select regions of Asia.The study underscores the significant changes anticipated in the distribution of T.baccata due to global climate change.It suggests that the threshold for addressing climate change on this particular species has been exceeded,and emphasizes the need for concerted efforts to mitigate and adapt to climate change impacts on ecosystems and organisms.As climate change affects various aspects of life,the study advocates for sector-wide plans.These would include efficient resource utilization,selecting genotypes for afforestation of this species with lower water requirements,incorporating climate change predictions into management plans,conserving biological and genetic diversity,and developing in-situ and exsitu conservation strategies.Anticipation of future climate changes and corresponding measures in response are crucial to minimizing the impact on this species.The study recommends establishing mixed forests composed of species resilient to a range of climate scenarios,thereby enhancing forest continuity across regions with varying degrees of climate impact.Genetic diversity is an important defense mechanism important to preserving it.Global climate change will result in significant alterations in the distribution of certain species,potentially causing population declines.Intervention is required to support the adaptation of vulnerable species,necessitating forward-looking strategies that anticipate shifts in their habitat suitability.This study emphasizes the implications of climate change for T.baccata and underscores the urgency of targeted conservation efforts to protect its populations and ensure long-term persistence.展开更多
[Objective] Abscisic acid （ABA）, a plant endogenous hormone, plays an important role in plant responses to adverse environments. This study was to explore the effects of exogenous ABA on the drought resistmlce of ap...[Objective] Abscisic acid （ABA）, a plant endogenous hormone, plays an important role in plant responses to adverse environments. This study was to explore the effects of exogenous ABA on the drought resistmlce of apple rootstocks under simulated drought condition induced by polyethylene glycol （PEG）. [Method] Apple （Malus baccata） seedlings were employed as test material. There were five treatments （T1-5） designed as ABA application rates at 0 （T1）, 25 （T2）, 50 （T3）, 75 （T4） and 100 （T5） μmol/L in the hydroponic experiments. The changes of the relative leaf water content （RLWC）, root activity, malondialdehyde （MDA） content, proline （Pro） content, superoxide dismutase （SOD） activity and peroxidase （POD） activity were assayed under PEG stress. All indices were analyzed by principal component analysis （PCA） to evaluate the optimal ABA concentration alleviating drought stress. [Result] The different concentration of ABA could increase Pro content and antioxidant enzyme activities, relieve the descent of RLWC and decrease MDA content. Low levels of ABA increased root activity, whereas the high concentrations （T3-T5） inhibited it. Statistical analysis based on the PCA indicated that the cumulative contribution rate of the first two principal components was raised to 96.457%, and the PCA in the T2 scored the highest. [Conclusion] The exogenous ABA could decrease the damage caused by drought stress to Malus baccata seedlings and enhance the ability of drought tolerance by increasing osmolyte content, anti- oxidative enzyme activity and reducing the level of membrane lipid peroxidation. The optimal concentration of ABA was 25 μmol/L.展开更多
基金supported by the TUBITAK YOK 100/2000 Scholarship。
文摘This study looks at the impact of climate change on the future distribution of Taxus baccata L.,a species under threat.It examines how altitudinal changes may influence distribution,projecting scenarios to 2100 using the SSPs 585 SSPs 245 scenarios in 20-year intervals.The results show a contraction in distribution in areas such as in Iceland and the United Kingdom,with certain extreme points disappearing.Simultaneously,new suitable areas are expected to emerge in select regions of Asia.The study underscores the significant changes anticipated in the distribution of T.baccata due to global climate change.It suggests that the threshold for addressing climate change on this particular species has been exceeded,and emphasizes the need for concerted efforts to mitigate and adapt to climate change impacts on ecosystems and organisms.As climate change affects various aspects of life,the study advocates for sector-wide plans.These would include efficient resource utilization,selecting genotypes for afforestation of this species with lower water requirements,incorporating climate change predictions into management plans,conserving biological and genetic diversity,and developing in-situ and exsitu conservation strategies.Anticipation of future climate changes and corresponding measures in response are crucial to minimizing the impact on this species.The study recommends establishing mixed forests composed of species resilient to a range of climate scenarios,thereby enhancing forest continuity across regions with varying degrees of climate impact.Genetic diversity is an important defense mechanism important to preserving it.Global climate change will result in significant alterations in the distribution of certain species,potentially causing population declines.Intervention is required to support the adaptation of vulnerable species,necessitating forward-looking strategies that anticipate shifts in their habitat suitability.This study emphasizes the implications of climate change for T.baccata and underscores the urgency of targeted conservation efforts to protect its populations and ensure long-term persistence.
文摘[Objective] Abscisic acid （ABA）, a plant endogenous hormone, plays an important role in plant responses to adverse environments. This study was to explore the effects of exogenous ABA on the drought resistmlce of apple rootstocks under simulated drought condition induced by polyethylene glycol （PEG）. [Method] Apple （Malus baccata） seedlings were employed as test material. There were five treatments （T1-5） designed as ABA application rates at 0 （T1）, 25 （T2）, 50 （T3）, 75 （T4） and 100 （T5） μmol/L in the hydroponic experiments. The changes of the relative leaf water content （RLWC）, root activity, malondialdehyde （MDA） content, proline （Pro） content, superoxide dismutase （SOD） activity and peroxidase （POD） activity were assayed under PEG stress. All indices were analyzed by principal component analysis （PCA） to evaluate the optimal ABA concentration alleviating drought stress. [Result] The different concentration of ABA could increase Pro content and antioxidant enzyme activities, relieve the descent of RLWC and decrease MDA content. Low levels of ABA increased root activity, whereas the high concentrations （T3-T5） inhibited it. Statistical analysis based on the PCA indicated that the cumulative contribution rate of the first two principal components was raised to 96.457%, and the PCA in the T2 scored the highest. [Conclusion] The exogenous ABA could decrease the damage caused by drought stress to Malus baccata seedlings and enhance the ability of drought tolerance by increasing osmolyte content, anti- oxidative enzyme activity and reducing the level of membrane lipid peroxidation. The optimal concentration of ABA was 25 μmol/L.
