During the formation of heartwood, changes occur like deposition of chemicals and color changes. Mainly it becomes non-living and inactive. The keen observation of heartwood formation based on physiological function is question mark for me.
its (also) called "necrobiosis" and there is a vast amount on literature on that...check for example Elisabeth Magel's work
Thank you Sir..
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Specially in Heartwood, Related to Ayurvedic medicine
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