Sapwood transforms into heartwood despite the xylem being composed of dead tissue
Sapwood transforms into heartwood as living ray parenchyma cells within the otherwise dead xylem tissue undergo programmed cell death and chemical modifications in the transition zone.
The retrieved papers consistently demonstrate that heartwood formation is driven by physiological processes—specifically involving living ray parenchyma cells embedded within the xylem—prior to their programmed cell death. The claim is well-supported by multiple histochemical and anatomical studies.
Ruoke Ma, Heng Liu, Yunlin Fu, Yingjian Li, Penglian Wei, Zhigao Liu. Variation of Chemical Components in Sapwood, Transition Zone, and Heartwood of Dalbergia odorifera and Its Relationship with Heartwood Formation. 2021. https://doi.org/10.3390/f12050577
The study discusses the chemical transformations occurring in the xylem as sapwood transitions into heartwood.
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M. Traoré, J. Kaal, A. Martínez Cortizas. Variation of wood color and chemical composition in the stem cross-section of oak (Quercus spp.) trees, with special attention to the sapwood-heartwood transition zone.. 2022. https://doi.org/10.1016/j.saa.2022.121893
Research outlines how active wood cells in sapwood evolve into non-active cells in heartwood via the transition zone.
S. K. Datta, Anjani Kumar. Histochemical Studies of the Transition from Sapwood to Heartwood in Tectona Grandis. 1987. https://doi.org/10.1163/22941932-90000456
Histochemical analyses show significant physiological changes during the transition from sapwood to heartwood.
Ruoke Ma, Jia Luo, Weijie Wang, Yunlin Fu. Changes in the physiological activity of parenchyma cells in Dalbergia odorifera xylem and its relationship with heartwood formation. 2023. https://doi.org/10.1186/s12870-023-04592-2
Demonstrates that the transformation involves programmed cell death of ray parenchyma cells in the xylem.
Yulia L. Moshchenskaya, N. Galibina, T. Tarelkina, K. Nikerova, Maksim A Korzhenevsky, L. Semenova. Cambial Age Influences PCD Gene Expression during Xylem Development and Heartwood Formation. 2023. https://doi.org/10.3390/plants12234072
Examines programmed cell death processes in xylem ray parenchyma cells during heartwood formation.
Jiawen Li, Yuanjing Zhu, Guangyao Ma, Haoling Li, Yun Yang, Hui Meng, Jianhe Wei. Patterns of Heartwood Formation and Its Key Response Signaling Molecules in Dalbergia odorifera T. Chen. 2025. https://doi.org/10.3390/ijms26104629
Confirms that secondary metabolites are synthesized in situ in ray parenchyma before programmed cell death creates heartwood.
Pingping Guo, Xiping Zhao, Zifei Yang, Ying-xin Wang, Hongying Li, Lepei Zhang. Water, starch, and nuclear behavior in ray parenchyma during heartwood formation of Catalpa bungei ‘Jinsi’. 2024. https://doi.org/10.1016/j.heliyon.2024.e27231
Observes the behavior of starch, water, and nuclei in ray parenchyma cells as sapwood ages into heartwood.
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