Crime Pays But Botany Doesn't

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Did you know that the distal ends and tips of roots are the only parts doing any absorption? What the hell are cortical bundles and why did cacti evolve them? How can cactus roots grow so quickly after a rain and what do we mean by "root spurs"?  How does the South American parasitic plant Tristerix aphylla behave like a fungus when it grows inside its host plant? And if you still don't understand what the hell Parenchyma is, here's your chance for a refresher.

Dr. Jim Mauseth taught plant anatomy and botany for 30 years at UT Austin and literally wrote a textbook on the subject. He's also written a few other books and over a hundred research papers studying the anatomy of plants with an emphasis on cacti, and has traveled to South America and Mexico studying the family on numerous occasions. In this episode we go deep on plant tissues, plant cells, cellular components, plasmodesmata, cell membranes and how the a plant is technically only one single cell when you really get down to it...

A reminder that the previous podcast episode on plant tissues covers some of the terminology in this episode, such as the 3 main tissue types : epidermal tissues, ground tissues (parenchyma, collenchyma, sclerenchyma) and vascular tissue (xylem and phloem). I highly suggest listening to that episode first or at least pausing the podcast if you're unclear about some of the terminology. Remember that tracheids and vessel elements apply only to xylem (which only moves water) and "sieve tubes", "companion cells" and "sieve plates" apply only to phloem (which only moves sugars and photosynthates). 

The 3 ground tissues are : parenchyma (primary walls only, large intercellular spaces, alive at maturity), collenchyma (only produces primary cell walls with thickened and re-inforced corners, alive at maturity), sclerenchyma (primary and secondary cell walls, dead at maturity).

Thumbnail photo shows the incredibly thick cuticle of Ariocarpus, with epidermis below and hypodermis below that, marked with arrows. Vertical hole on the right side is the stomatal opening in the cuticle

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In this episode: 
We talk about the three main types of tissue systems in plants :

Dermal (trichomes, guard cells)
Ground (Parenchyma, Collenchyma, Sclerenchyma) & 
Vascular (xylem and phloem)

What the hell are these tissues? Whatta they mean? Whatta they do?

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Christ Best is the State Botanist with US Fish and Wildlife Service for the state of Texas, a position he has held for 30 years. He has extensive knowledge of plants in the Rio Grande Valley of South Texas, specifically. He has worked with numerous rare and endangered plant species including Physaria thamnophila, Asclpeias prostrata, Thymophylla tephroleuca and many more. He has also worked with mycorrhizae on cactus roots, propagating rare and endangered species, and navigating the sometimes tenuous relationship with private landowners in the state. In this episode we talk about propagating rare plants, fostering symbiotic relationhips between roots and beneficial fungi and bacteria in the soil microbiome by intentionally innoculating plants in propagation, endangered plants, peyote conservation (or lack there of), how geology can affect the plant species that occur in an area, and what random but interested people can do for plant conservation.

A reminder: the ads on this podcast (as well as most podcasts) are terrible. You can get AD-FREE versions of this podcast episode on the crime pays patreon (https://www.patreon.com/CrimePaysButBotanyDoesnt)

Dave Farina is the host of the "Professor Dave Explains" youtube channel, an educational youtube series exploring a wide variety of scientific topics and offering free eduational tutorials on subjects ranging from human evolution to organic chemistry to arthropod taxonomy. In recent years, he has published a number of videos debunking pseudo-science quacks, charlatans, creationists, and flat-earthers. 

Can't stand the ads? All episodes of the CPBBD podcast are on the Patreon, ad-free, for $5 a month at: https://www.patreon.com/CrimePaysButBotanyDoesnt

David Keller is a historian and archaeologist from West Texas who based out of Alpine, Texas.

Originally recorded as a class lecture, this podcast episode contains information on root structures and shoots and is accompanied by the PDF found at : 

https://drive.google.com/file/d/1vA_n1OWw2PpUJSqn3m5lbSOymH_aARB7/view?usp=drivesdk

as well as chapters 23,24,&25 of "Raven Biology of Plants" textbook which can be downloaded for free on libgen.is in PDF form and read on a tablet.

We cover : Apical Meristems, Lateral Meristems (and why monocots don't have any), root caps, cortex, endodermis, pericycle, , xylem, phloem and the components of each.

This is the spoken part of a lecture that was presented for patreon subscribers and students on the patreon. To see the accompanying PDF and hear ad-free podcast episodes sign up for the crime pays patreon at patreon.com/crimepaysbutbotanydoesnt

We talk about the basic elements of plant identification, how it ties into plant evolution,  evolutionary trees aka cladograms, what "phylogeny" means and why monophyletic" and "synapomorphies" are such important terms.

A reminder: the ads on this podcast (as well as most podcasts) are terrible. You can get AD-FREE versions of this podcast episode on the crime pays patreon (https://www.patreon.com/CrimePaysButBotanyDoesnt)

In this episode we talk about Paronychia congesta, one of Texas' Rarest Plants, which grows on Caliche barrens in Jim Hogg County, as well as Caliche blazing stars, the Crested Peyote of West Texas, planting native plant gardens at Amada's House in Mirando City,and plenty more.

I became fixated on lycophytes because of some of the cool desert-dwelling members of the genus Selaginella, not to mention the utterly weird "clubmosses" that thrive in places as disparate as Northern Wisconsin and the slopes of volcanoes in New Zealand, but in this episode botanist Jeff Benca tells us about his work with relatives of the genus Isoetes ("Quillworts") and how their 250 million year old relatives might have been able to survive the biggest extinction in Earth's history, otherwise known as the Permian Extinction or "The Great Dying".

Jeff's IG : @jeffbenca
FB : Jeff Benca

Thumbnail is Phlegmariurus dalhousianus, photo by Jeff Benca. Other species mentioned in this episode is Lycopodium vestidum. Extinct species mentioned here that were thriving during the Permian Extinction Event and are related to Isoetes are Pleuromeia and Annalepis. 

Compounds that volcanic dykes and sills interacted with that were locked up in salt deposits and related to UV shield degradation during the Permian Extinction Event were methyl bromide and methyl chloride.

A rant about West Texas Pines and the sand blazing star. At the 40 minute mark we begin our dive into the convoluted, confusing but utterly cool phenomenon of Alternation of Generations we talk mostly about Bryophytes (mosses and liverworts) and Lycophytes ("spikemosses" and "clubmosses"), and the ferns, but not gymnosperms or angiosperms). This turns into more of a "lesson" on the subject than a podcast episode. 

Key terms to remember : 

Gametophyte (haploid), Sporophyte (diploid)
Haploid - 1 set of chromosomes aka 1 copy of the genome
Diploid - 2 sets of chromosomes aka 2 copies of the genome (one as a backup copy)
Meiosis (takes a diploid cell and produces haploid daughter cells, two of which later come together to form a diploid zygote/sporophyte)
Mitosis (Cell divides and produces cells identical to whatever the parent cell was, whether that parent cell was haploid or diploid. Mitosis doesn't reduce the chromosome number by half). Meiosis is synonymous with sex/reproduction/the production of haploid cells).

Evolutionary lineages referenced in this episode and their phylogenetic classification:

Bryophytes (An informal paraphyletic classification used to refer to the non-vascular Phyla Anthocerotophyta (hornworts), Marchantiophyta (liverworts), and Bryophyta (mosses) 

Lycophytes : Class Lycopodiopsida, contains 3 orders: Lycopodiales (1 Family : Lycopodiaceae; 3 Subfamilies : Huperzioideae, Lycopodielloideae, Lycopoideae), Selaginellales (1 family : Selaginellaceae), & Isoetales (1 family : Isoetaceae).

Ferns : Class Polypodiopsida.
Contains 4 Subclasses : Equisetidae (Horsetails), Marattiadae (Marratioid Bastards including Angiopteris evecta with 20' long fronds), Ophioglossidae (Whisk Ferns, Grape Ferns, Moonworts), and Polypodiidae (Leptosporangiate Ferns, aka the "classic" ferns including the majority of what people think of when they think of ferns including Maidenhairs, Cinnamon Ferns, Sensitive Ferns, Filmy Ferns, Forked Ferns, Cheilanthoid "Desert" Ferns, Mosquito Ferns, Tree Ferns, Aspleniums, etc.


THUMBNAIL : Archegoniophore (haploid) and Non-photosynthetic Sporophyte (Diploid) of the Baja California liverwort Asterella palmeri, photo by Ken-Ichi Ueda