What are two putative apomorphies of the Asparagales? Of the Asparagales minus the Orchidaceae?

Name: Problem 29, Chapter 7: Plant Systematics
Uploaded: 2020-06-02T19:40:29-08:00
Duration: 1 min 58 s
Channel: Ricajoy Montero
Description: What are two putative apomorphies of the Asparagales? Of the Asparagales minus the Orchidaceae?

step 1 Problem 23 here, we have the structure for D3Os. I just have two copies of it. So D3Os is underg

What are two putative apomorphies of the Asparagales? Of the...

Key Concepts

Carbohydrate Storage Organ

Many members of the Asparagales possess specialized carbohydrate storage organs such as bulbs, corms, rhizomes, or tubers. The evolution of these structures is considered a putative apomorphy because they represent a derived feature that provides an adaptive advantage by allowing these plants to survive unfavorable conditions, and they are a common characteristic within the order.

Septal Nectary

A septal nectary is a glandular tissue located in the ovary that facilitates nectar secretion. In many Asparagales, the presence of a septal nectary is considered a putative apomorphy, representing a specialized modification of ovary structure that may have played an important role in the evolution of their diverse pollination strategies.

Anther Appendage

In many non?orchid members of the Asparagales, a small sterile appendage at the base of the anther is present. This feature has been proposed as a putative apomorphy for Asparagales minus the Orchidaceae, serving as an additional morphological marker that can help define the group independent of the highly derived floral structures found in orchids.

Apomorphy

An apomorphy is a derived character or trait that appears in an ancestral species and is shared by its descendants, thereby helping to define a monophyletic group. In systematic biology, apomorphies are used to diagnose clades and establish evolutionary relationships by distinguishing them from ancestral states.

Asparagales

The Asparagales are an order of monocotyledonous flowering plants that includes a diverse array of families. Although the group is defined primarily through molecular phylogenetic methods, several morphological characters have been proposed as potential synapomorphies or apomorphies to help circumscribe the order within the monocots.

Orchidaceae

The Orchidaceae is a large family within the Asparagales that exhibits extreme morphological specialization, especially in its floral structures. Its unique adaptations can sometimes obscure characters that are shared with other Asparagales, so alternative sets of synapomorphies (such as anther appendages or specific pollen features) are considered when this family is excluded from the analysis.

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