Secondary growth is initiated by the activity of the vascular cambium as far as the steler region is concerned.This intrafascicular cambium is absent in the open vascular bundles of the monocot stem, thus the process cannot take place . Secondary growth in the extrasteler region is initiated by the production of secondary vascular tissue. Since, as explained above, monocots do not undergo secondary growth in the steler region, there are no secondary tissues to initiate such a growth in the extrasteler region.
In Bougainvillea, a series of cambia arise outside the oldest phloem. Palm trees undergo diffused secondary growth in which increase in the trees diameter is due to enlargement of the parenchymatous cells. Source : Alllnterview.com
Secondary growth is initiated by the activity of the vascular cambium as far as the steler region is concerned.This intrafascicular cambium is absent in the open vascular bundles of the monocot stem, thus the process cannot take place . Secondary growth in the extrasteler region is initiated by the production of secondary vascular tissue. Since, as explained above, monocots do not undergo secondary growth in the steler region, there are no secondary tissues to initiate such a growth in the extrasteler region.
In Bougainvillea, a series of cambia arise outside the oldest phloem. Palm trees undergo diffused secondary growth in which increase in the trees diameter is due to enlargement of the parenchymatous cells. Source : Alllnterview.com
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