Elizabeth Larkin elarkin at NMT.EDU
Mon Jul 12 15:50:27 EST 1999

Plants often do have a major problem with toxic elements in their
environment, and species vary widely in their ability to exclude them or
to tolerate them after they have been absorbed. Boron is an essential
element that is toxic at slightly higher levels than needed to prevent a

As David commented, plants do have to regulate their intake of required micronutrients. When mutants are produced that can't perform this basic function there some consequences such as a thickening of leaves smaller stature or delayed flowering

	Just my two cents
	Elizabeth Larkin 

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