Yellow leaf segments in Amorph. albus

Aroiders,

would anyone know the cause of the symptoms shown here:
http://www.bildercache.de/anzeige/20080711-111156-515.jpg

This is a leaf from one offset of an Amorphophallus albus; the leaf was
grown from one big tuber with several offsets, but only two offsets show
the symtoms.

This was a request from a member of the German Exoten-Forum; see:
http://www.exoten-forum.de/vb/showthread.php?t=23232&page=30
post #297

I would not vote for a chimaera as it was suggested in the forum, but
rather for a nutritional disorder or affected roots of that specific
offset.
It is remakable, too, that rather leaf segments further away from the
first branching of the leaf are sowing the symptom, but not the leaf
segments closer to the branchning.

Any suggestions?

Happy growing,
Bernhard.




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