Difference between Subrate rooted plants and stem plants - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 4 Old 11-14-2012, 10:58 AM Thread Starter
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Difference between Subrate rooted plants and stem plants

I understand swords are a substrate rooted plants and are heavy feeder, and that wisteria is a stem plant. But what is the difference between the two types? Don't they both have roots that are planted within the substrate?

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post #2 of 4 Old 11-14-2012, 12:10 PM
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'rooted' plants like crypts and swords are usually amphibious: in their native habitat their leaves are out of the water.

Rooted plants take most of their nutrients from the substrate tjrough their roots, and their growth originates from their crown.

Stem plants use their roots mostly as an anchor. (hygrophilas do like root tabs though). Their growth also originates from "nodes" along the stem.
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post #3 of 4 Old 11-14-2012, 01:34 PM Thread Starter
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Quote:
Originally Posted by redchigh View Post
'rooted' plants like crypts and swords are usually amphibious: in their native habitat their leaves are out of the water.

Rooted plants take most of their nutrients from the substrate tjrough their roots, and their growth originates from their crown.

Stem plants use their roots mostly as an anchor. (hygrophilas do like root tabs though). Their growth also originates from "nodes" along the stem.

Appreciate that, thank you!

125Gal: 7 Silver Dollars, 1 Albino BN Plecos, 1 Green Terror, 1 Gold Severum, Red Severum, 8 Rio Cahals, and 2 Festivum

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29Gal: Quarentine/Hospital Tank

20Gal: Female Pastel Ball Python
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post #4 of 4 Old 11-14-2012, 01:35 PM
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Redchigh's mention of the crown and node is the key. What I have termed "substrate rooted plants" for the purpose of our profiles are plants that all have a crown from which leaves emerge upward and roots downward. There may be a tuber or rhizome at the crown.

Stem plants by contrast have no crown, but a continuing stem which will grow literally forever, and roots and leaves emerge along the stem from nodes. Side stems may emerge, especially if the stem is broken.

All plants, be they substrate-rooted or stem, assimilate nutrients through their roots and leaves. Some nutrients can only be taken up via the leaves [or in some cases the plants prefer this]--carbon, potassium, nitrogen (ammonium), oxygen, calcium, magnesium and sulphates.

The nutrients taken up primarily through the roots must be in the water, since plant roots can only assimilate nutrients from water.

The substrate rooted plants as redchigh mentions are usually amphibious bog plants in nature, spending half the year emersed and half submersed. It is during the emersed phase that they grow most prolifically and flower. Nutrients in the "soil" (which is often less like soil as we know it) dissipate into the water and are taken up via the roots. Things change a bit when these plants are submersed, which is one reason they lose their aerial leaves and develop often very different submersed leaf forms.

Byron.
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Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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