Exploring Possibilities, Methods, And Challenges Of Cloning Extinct Species Of Trees

Reviving extinct species of trees through cloning has become a topic of great interest in the scientific community. This emerging field offers the potential to bring back lost biodiversity and restore ecosystems, as well as discover unknown medicinal benefits. However, it also presents inherent dangers and challenges that need to be carefully addressed. Scientists around the globe are exploring the possibilities, methods, processes, advances, inherent dangers, and potential medicinal benefits associated with cloning extinct species of trees.

Conifers, Extinct Tree Example

Conifers are gymnosperms, meaning they have seeds that are not enclosed in a fruit. They are typically evergreen and have needle-like leaves. Some examples of extinct conifer species include:

Araucarioxylon arizonicum was an ancient conifer tree that lived approximately 225 million years ago during the Late Triassic Period. This tree was a dominant species in the Chinle Formation, which is now situated in the southwestern United States, particularly in Arizona, New Mexico, Nevada, and Utah.

extinct conifer tree

Leaf

The leaves of Araucarioxylon arizonicum were linear, narrow, and needle-like, similar to those of present-day Araucariaceae family members. These leaves were spirally arranged along the branches, and they were likely adapted for water conservation, as the Chinle Formation was characterized by a warm, seasonal climate with both wet and dry periods.

Tree Bark

The bark of Araucarioxylon arizonicum was relatively thick and comprised of a fibrous, woody tissue. The outer layer of the bark had a somewhat rough texture and could have been covered with a resinous, protective coating. The bark pattern consisted of diamond-shaped or hexagonal patterns, formed by the growth rings of the tree.

Ancient Confer Seed

Araucarioxylon arizonicum was a gymnosperm, and like other gymnosperms, it produced seeds that were not enclosed in a fruit. The seeds were likely borne in large, woody cones, similar to those of modern Araucariaceae. The exact morphology of the cones and seeds is not well-documented due to the scarcity of fossil evidence. However, it can be inferred that they were wind-dispersed and required a specific set of environmental conditions for successful germination.

Method Of Reproduction

As a gymnosperm, Araucarioxylon arizonicum reproduced through the process of fertilization via wind-borne pollen. Male cones produced pollen, which was carried by the wind to female cones containing ovules. Upon successful fertilization, seeds would develop within the female cones. Once mature, these seeds would be dispersed by the wind, and if they landed in favorable conditions, they would germinate and grow into new trees.

Where This Ancient Conifer Grew

Araucarioxylon arizonicum primarily grew in the Chinle Formation, which covered a large area in the southwestern United States during the Late Triassic Period. The environment was characterized by floodplains, river systems, and lakes, with a warm, seasonal climate. The distribution of Araucarioxylon arizonicum within this region suggests that it was well-adapted to a variety of environments, ranging from wet, swampy areas to more arid, upland regions.

Deciduous, Ancient Tree Example

Deciduous trees are angiosperms, which have seeds enclosed in a fruit. They shed their leaves annually. Some examples of extinct deciduous tree species include:

Williamsonia was a seed-bearing tree belonging to the Cycadeoid (Bennettitales) family that lived during the Jurassic and Cretaceous periods, approximately 200-70 million years ago. Fossil records of Williamsonia have been found in various parts of the world, including North America, Europe, and Asia.

extinct deciduous tree

Extinct Tree Leaf

The leaves of Williamsonia were large and pinnately compound, resembling those of modern cycads or ferns. Each leaf consisted of a central rachis (stalk) with numerous leaflets arranged in a feather-like pattern. The leaflets were elongated and tapered towards the tip, with parallel venation. The overall appearance of Williamsonia leaves was similar to that of the living cycad family, Zamia, though it is not closely related.

Extinct Tree Bark

The bark of Williamsonia has not been well-preserved in the fossil record, making it difficult to provide a detailed description. However, based on its close relatives, it is likely that the bark was relatively thick and fibrous, providing structural support and protection to the tree.

Ancient Deciduous Tree Seed

Williamsonia produced seeds within specialized reproductive structures called bennettitalean cones. The cones were borne on short stalks and contained numerous seeds, which were not enclosed in a fruit, as is the case with angiosperms. The seeds were likely large and oval-shaped, with a hard outer covering.

Reproduction Method

Williamsonia reproduced via a unique reproductive structure that was a combination of characteristics found in both cycads and angiosperms. The male and female reproductive organs were housed within separate bennettitalean cones. Male cones produced pollen, which was carried by the wind or potentially by early insects to the female cones. Upon successful fertilization, seeds would develop within the female cones. Once mature, these seeds would be released and dispersed, possibly by wind or through the aid of animals, and if they landed in suitable conditions, they would germinate and grow into new trees.

Where Ancient Deciduous Trees Grew

Williamsonia had a widespread distribution during the Jurassic and Cretaceous periods, with fossil evidence found across North America, Europe, and Asia. The habitats it occupied were likely diverse, including tropical and subtropical regions with abundant moisture, such as swamps and forests near rivers and lakes. The global distribution of Williamsonia suggests that it was a highly adaptable and successful plant species during its time.

Possibilities And Advances

Cloning extinct species of trees could potentially restore lost biodiversity and contribute to a healthier ecosystem. Furthermore, previously undiscovered medicinal compounds could be extracted from these revived species, leading to new treatments for various illnesses.

Methods And Processes, De-Extinction, Cloning

  • Cloning techniques involve several methods, including somatic cell nuclear transfer (SCNT) and embryo splitting. However, for extinct tree species, two major approaches are being explored: De-extinction through genetic engineering: This involves extracting DNA from preserved samples, sequencing the genome, and then editing the genes of a closely related living species to match the extinct species. A viable embryo is then produced and implanted in a surrogate host.
  • Cloning from ancient tissue: Researchers could potentially use well-preserved plant tissue to clone an extinct tree species. This requires viable cells that can be used to produce embryos, which can then be grown into plants.

Inherent Dangers Reviving Extinct Trees

Reviving extinct species of trees comes with several potential risks:

  • Genetic anomalies: Cloned trees may have genetic defects, which could lead to unforeseen consequences in ecosystems.
  • Disease susceptibility: Resurrected species might lack immunity to modern diseases and pests, increasing the risk of epidemics.
  • Ecosystem disruption: The introduction of extinct species might alter existing ecosystems, causing unforeseen consequences for native plants and animals.

Medicinal Benefits Yet To Be Discovered

The potential medicinal benefits of cloning extinct tree species are vast and uncharted. Ancient trees may contain unique compounds with untapped therapeutic properties. By cloning and studying these species, researchers could unlock new treatments for a variety of health conditions.

Cloning extinct species of trees presents a unique opportunity to restore lost biodiversity and explore new medicinal benefits. However, it also comes with inherent dangers that need to be carefully considered. As research advances, it is crucial to weigh the potential benefits against the risks, in order to develop responsible and ethical approaches to reviving extinct tree species.

Article posted, Jan 3, 2024