Re: Catopsis

SCHLAUER@chemie.uni-wuerzburg.de
Wed, 17 Jul 1996 17:17:31

Dear friends,

> To my knowledge (and I grow several) Catopsis are not carnivorous.

At least not carnivorous sensu stricto.

> (...) are all bromeliads carnivorous?

At least all cistern-forming (i.e. a large proportion of all)
bromeliads are subcarnivorous.

> My amatuer's answer is no.

My amateur's answer is similar.

> If the opposite were true then virtually any
> plant capable of absorbing nutrients through its leaves (anyone know one
> that can't)...

Perhaps some Cactaceae can't but I am not really sure in this respect.

> ...would fall into the same class.

Yes, indeed.

> Most defintions require that the animal nutrients used by the plants be
> absorbed by digestive enzymes secreted by the plant. Only then will it be
> considered carnivorous.

Exactly.

> This leaves my treasured Heliamphora in an awkward position since (correct
> me if I'm wrong here) no digestive enzymes have yet been identified in the
> genus.

This is no longer true. In a recent paper, Jaffe, Michelangeli & al.
have demonstrated intrinsic proteolytic activity in _Heliamphora
tatei_.

> That's all right, I'm going to grow them anyway! >

Yes, in any event don't throw them away.

Kind regards
Jan