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November 2

 

general-viewOur field continues to grow. It looks pretty good, but Iím worried that weíve got such small seedlings and it is getting rather late in the season.


general-closeup-rowOur row is growing well. Most of the seedling have at least two leaves and some have three leaves.

 


three-leaf4I thinned an area of a row so thereís only this plant that we can watch. It will probably grow a little better than the plants in the last picture. This plant nearly has three fully expanded leaves. In the Feekes wheat staging system this seedling is in stage 2, because tiller formation has been initiated. Generally, when you see a wheat seedling with three leaves you will see a tiller in the axil of the first leaf (but you have to pull the leaf back to see it).
This seedling has some interesting things happening. It has two tillers but they are coming from different areas of the seedling. We generally think tillers develop from thecoleoptilar-tiller5 crown area (The crown is the nubby white area about one inch above the seed. It has several nodes that donít grow above the soil surface. Weíll talk more about nodes in the future.) and you can see a small tiller here. But if you look below the crown area where the seed and roots are you can see another tiller. That tiller has a special name. Itís called the coleoptilar tiller and it is developed from the coleoptilar node next to the seed. You canít see these nodes that underground without a good microscope, so youíll have to trust me!
coleoptilar-tillar1Hereís another seedling with a coleoptilar tiller. They really arenít that rare.

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