Secondary Growth in Monocots-3

BananaSAM240.jpg (22328 bytes)
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Meristematic cells in the Primary Thickening Meristem do not stain as well as adjacent cells and appear as a light band in microscopic preparations.

Try to locate the radial cell files in the adjacent Photos. Concentrate on the far left region as indicated by one of the boxes.

If you examine the stems of monocots that have secondary growth, you will see that the leaves are tightly clustered at the stem tip and that  little internodal elongation occurs. You will see one leaf base on top of another, on top of another. See the image below.

  

BananaSAMPrimThickMeiLabb.jpg (70390 bytes)

Closer View of the PTM in Banana. The
Boxed area on the left will be displayed
below.
Try to see the files of cells produced by
the PTM in the images below.
BananaSAMPrimThickMeiCrop.jpg (11193 bytes)
BananaSAMPrimThickMeiNegCrop.jpg (14663 bytes)
Positive and Negative Images from the Left-hand Box in the larger image above.

HalaPepe.jpg (51400 bytes)
Hala pepe a local Monocot with Secondary Growth

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