In <4ip494$g5g at sunca.ncaur.gov> skorycd at ncaur1.ncaur.gov (Chris Skory)
>>This question will probably reveal my ignorance in plant physiology,
>but, I was curious what general types of compounds do plants secrete
>from their roots. I ask this because I saw some plants (eg lettuce,
>carrots, etc) growing in sterile medium the other day. The medium
>became increasingly more turbid and brown as the culture grew. Is
>this protein, alkaloids or some other secondary metabolite. Any
>help would be appreciated.
>skorycd at ncaur1.ncaur.gov>
It appears that the "sterile medium" has been compromised. In plant
hydroponics, the growing medium is enriched with soluble nutrients and
circulated over again. You may have a spore culture started, or a
bacterial invasion. Check it out under the microscope!
Micro, not a microbe!