Developmental Biology: Homeotic mutation in fruitfly Vs Hibiscus

Homeotic Mutations in Fruit Flies and Hibiscus

The two pairs of wings fruit fly results from a bithorax mutation in the third thoracic segment. Normally, fruit flies have one pair of wings from the second thoracic segment and one pair of halteres from the third.

In fruitflies, the second thoracic segment develops into wings, while the third segment develops into halteres.

In contrast, the ultrabithorax mutation causes the third thoracic segment to transform into the second thoracic segment, resulting in two pairs of wings, similar to butterflies!?

Congratulations, Sailakshmi, @⁨~M S Sailekshmi⁩ for bringing your :hibiscus: Hibiscus from the garden to the discussion!

Is it a mutant?:cherry_blossom:

What differences we are seeing here?:cherry_blossom:

IMG_20241005_070237

In the Hibiscus, we have sepal, petal, stamen, and carpel. In this one, we can see sepal, petal, petal, stamen, and carpel.


In hibiscus, flowers typically consist of sepals, petals, stamens, and carpels. However, double-layered hibiscus has been observed in Sailakshmi’s Homelab, indicating that if the expression of AGAMOUS orthologous genes is down-regulated, it will result in the transformation of stamens and carpels into petaloid structures.


Reference:

Homeosis phenomenon found in the double flower type I and II, where the reduction number of stamen has a

correlation with the additional number of petals, could be explained as an addition of one whorl occurs in parallel to
the deletion of the other [10]. The results showed that the structure of the stamen-petal intermediate closer to the
position of the stamen circle, while the petaloid structure formed in a position that is closer to the corolla circle. This
phenomenon does not only occur in the double and crested H. rosa-sinensis flowers, but also observed in Potentilla
fructicosa [11]. Irish (2000) *argues that the formation of stamen-petal intermediate structures is due to non-
expression of some of the AGAMOUS orthologous genes [12]. If the AGAMOUS orthologous genes expression is
down-regulated, it will have an effect of changing the stamen and carpel into petaloid structure

https://www.researchgate.net/publication/328469354_Comparative_morphology_of_single_and_double_flowers_in_Hibiscus_rosa-sinensis_L_Malvaceae_A_homeosis_study.

ABC model of flower development
Class A genes :
APETALA1(AP1)
APETALA2 (AP2)
Class B genes :
APETALA3(AP3)
PISTIL-LATA (PI)
Class C genes :
AGAMOUS (AG)
Sepal = AP1+AP2 (class A genes )
Petal=AP1+AP2+AP3+PI (class A+Class B genes )
Stamen=AP3+PI+AG ( Class B+Class c)
Carpel=AG ( class C genes )

https://www.researchgate.net/figure/The-ABC-model-A-The-ABC-functions-are-indicated-as-boxes-with-the-Arabidopsis-genes_fig2_7876365

A) Ubx is responsible for all of the differences between the second (T2) and third (T3) thoracic segments. Ubx loss-of-function mutations transform halteres (green box, center panel) into wings (left panel); Ubx gain-of-function in T2 transforms the wings into halteres (right panel). B) In this study, tissue-specific chromatin immunoprecipitation was performed with pure populations of haltere or T3 leg imaginal discs, both of which express Ubx in all cells (green) and express Hth (red) in the subset of cells that will give rise to proximal appendages and body wall.https://www.researchgate.net/figure/A-Ubx-is-responsible-for-all-of-the-differences-between-the_fig1_51042428

Different colored Hibiscus flower

Flower: Hibiscus
Data collected by Theertha
Place: Kozhikode

Discussions are related to Hibiscus

Mobile camera as a HomeLab Instrument for scientific research and a Medium for Collaboration. 8:24 am 2 November, Madel, Thivim, Goa Photo mcarunan
Why with such elaborate structures and no seed formation, in this popular plant, Hibiscus or Shoe flower plant? Any references?

Context to curriculum whatsapp group discussions:

[02/11, 8:47 am] Amirtha CUBE: This is hibiscus flower i can see anther, filament,style,stigma.@⁨Arunan sir please tell about expectation and hypothesis sir?
[02/11, 8:50 am] Arunan sir : Objective
How to take better and better pictures for documentation in HomeLab Scientific Research, using our regular Mobile Camera.
No complaints of lack of facility.:innocent:
[02/11, 8:54 am] Arunan sir : When did you ever see the details of the stigma the Hibiscus Flower?
The picture could be more focussed with no shaking. Youngsters could do better. Please try @⁨Amirtha CUBE⁩ and others.

Let’s get the details, because the devil and the divine are in the detail, they say.
[02/11, 9:03 am] Amirtha CUBE: Fruit not present in hibiscus plant sir.
[02/11, 9:21 am] Arunan sir : Why? Then, why such elaborate structure of an attractive flowers with so many Anthers and Stigma?
How do we explain? @⁨Amirtha CUBE⁩ @⁨Theertha⁩ @⁨Chithra Ma’am⁩ @⁨~Batul Pipewala⁩ and others.
[02/11, 9:21 am] +Batul: The Pic is really nice but when there is good daylight all types of camera will give same results.
[02/11, 9:22 am] Arunan sir : Really? Let’s do an experiment. @⁨~Batul Pipewala⁩
[02/11, 10:03 am] Theertha: :ok_hand::ok_hand: Good lighting+Good focus = Good pictures!? @⁨Arunan sir
[02/11, 11:26 am] Prithviraj CUBE: Androecium and gynoesium are prominently developed in hibiscus rosascience , what is interesting is seeds are not developing. That means fertilisation is not taking place. For understanding male and female parts of flower hibiscus is using from our school days. Why seeds are not forming?

[02/11, 6:33 pm] Sailekshmi CUBE: Hibiscus plants do produce seeds, but their fruit is not as conspicuous as the flowers. After fertilization, the hibiscus flower forms a small, dry capsule below the flower. This capsule contains the seeds, which are released when the capsule dries and splits open.
The reason why the hibiscus plant’s fruit is not as noticeable as its flowers is likely due to its reproductive strategy. Hibiscus plants are often propagated through cuttings or other vegetative methods, which are more efficient than seed propagation. Additionally, the showy flowers of the hibiscus plant are adapted to attract pollinators, which are essential for seed production.
While the elaborate structure of the hibiscus flower may seem unnecessary for a plant that doesn’t produce a large, fleshy fruit, it serves a vital purpose in attracting pollinators and ensuring the plant’s reproductive success. @⁨Arunan sir ⁩

https://www.researchgate.net/publication/343390885_Pollination_Ecology_of_Hibiscus_tiliaceus_L_Malvaceae_an_Evergreen_Tree_Species_Valuable_in_Coastal_and_Inland_Eco-Restoration
[02/11, 6:47 pm] Chithra Ma’am: Probably because Hibiscus x rosa-sinensis is a hybrid plant created by crossing species Hibiscus cooperi and H. kaute. Hybrids tend to be sterile.

[02/11, 6:48 pm] Chithra Ma’am: The plant here is a different species, Hibiscus tiliaceus which is not a hybrid.

Hibiscus flower follow up Day 2 November 3, 2024 Madel, Thivim, Goa Photo mcarunan


Hibiscus flower follow up Day 2 Stigma looks intact, Anthers look old November 3, 2024 Madel, Thivim, Goa Photo mcarunan

Fruiting & Seed formation in Shoe flower, true or false? Developing fruit of shoe flower? 9, November 2024 Madel, Thivim, Goa Photo mcarunan

Context to curriculum whatsapp group discussions

[11/11, 10:14 pm] Theertha: https://youtu.be/Om-Emh1Tj9k?si=ECsxLkjnkUpGPN16 seeds from hibiscus
[11/11, 10:16 pm] Vijaya Tilak CUBE: Never heard of hibiscus seeds Theertha! :innocent::innocent::innocent::innocent:
[11/11, 10:22 pm] Theertha: Effect of pollen morphology on hybridization and seed setting in hibiscus (Hibiscus rosa sinensis) @⁨Vijaya Tilak CUBE⁩ @⁨Arunan sir

https://www.researchgate.net/publication/382054942_Effect_of_pollen_morphology_on_hybridization_and_seed_setting_in_hibiscus_Hibiscus_rosa_sinensis
[11/11, 10:24 pm] Theertha: In vitro seed germination and seedling performance of Hibiscus coddii subsp. barnardii

https://www.researchgate.net/publication/346538257_In_vitro_seed_germination_and_seedling_performance_of_Hibiscus_coddii_subsp_barnardii

Photo shared by :Vijaya Tilak

Different colours of shoe flowers

SEED FORMATION IN HIBISCUS* ?:hibiscus:

Have you ever observed the seeds of Hibiscus plant?

In yesterday’s Chatshaala (6/03/2025)we discussed about the seed formation in Hibiscus.
I never made any attention to the seeds of hibiscus until Arunan sir asked “where is the seeds in Hibiscus”?

I always thought that stem cutting was the easiest method, so that is why we follow it to propagate Hibiscus.

In the discussion we came across a a paper which says Hibiscus produce seeds rarely !I wonder how valuable the question that sir asked turned out to be.

Photo: @Arunan

Discussion about the pollination in Hibiscus

Reference shared by @Arunan

Hibiscus rosa-sinensis is a southeast Asian native plant, grown by Indian as an ornamental plant. It propagates by hardwood cuttings. In rare conditions, it reproduces by fruit. On search of several years, we found fruit breeding Hibiscus plants in Krishna delta of Andhra Pradesh, India.
https://www.researchgate.net/publication/375496880_Fruit_breeding_by_Hibiscus_rosa-sinensis_An_inherited_phenomenon

Hibiscus :hibiscus:
Bloomed Flower
Place: Cherukkad, Kozhikode
Date:7/03/2025
Time:8.30am
Photo: Theertha

Hibiscus :hibiscus:
Flower about to bloom.
Place: Cherukkad, Kozhikode
Date:7/03/2025
Time:8.30am
Photo: Theertha


In the phase of falling down?
Place: Cherukkad, Kozhikode
Date:7/03/2025
Time:8.30am
Photo: Theertha

Photo of flower bud and it’s vertical section:Hibiscus
Place: Cherukkad, Kozhikode
Date:7/03/2025
Time:8.40am
Photo: Theertha

Found a fallen fruit with immature seeds in it :Hibiscus
Place: Cherukkad, Kozhikode
Date:7/03/2025
Time:9am
Photo: Theertha

Following pictures are from Cubists in Context to curriculum whatsapp group

Date of photo - 25/03/2024
Location -Grantroad Mumbai
Photo :Akansha
This is the mini hibiscus​:hibiscus: flower plant which i have at my home but only once this flower i observed had such divided petals…why the petals are such divided?? Is it due to environmental stress? What can be the reason for such a pattern of petals?:thinking::face_with_monocle:

Hibiscose rosa sinensis of our college campus
Family belong to malvaceae
Date -06/03/2025
Time - 1:33pm
Data collected by Nidhi devdas from pamgarh chhattisgarh

Follow up discussions:
[07/03, 3:19 pm] Arunan sir : Please post the photo of the plant especially branch with leaf and flowers or flower buds. @⁨Akanksha CUBE⁩

How are you sure, this is hibiscus or mini hibiscus?
[07/03, 3:26 pm] Arunan sir : What happens to the flowers after 1day, 2 days, 3 days etc.
When does the flower become a fruit of Hibiscus?
[07/03, 3:27 pm] Arunan sir : Please post photos of fruits, after the petals fall off, after a few days. @⁨Nidhidevdas CUBE⁩

Hibiscus: Queen of the flowers by Jim Howie

https://www.hibiscusworld.com/howie/ch12.htm


Fruit development was observed on the same flower tagged above.

Place :Cherukkad Kozhikode
Date:9/03/2025
Time:10.13am
Photo: Theertha

Based on the preliminary observations I made at home, about 3 flowers shows the fruit formation and immature falling of fruits.Why is Hibiscus afraid of genetic variations?:face_with_monocle: @⁨Akanksha CUBE⁩ @⁨Nidhidevdas CUBE⁩ and others.

[09/03, 11:03 am] Chithra Ma’am: Why do you think it is a developing fruit and not just the mature unfertilised ovary?
[09/03, 11:08 am] Arunan sir : Good question?
Hibiscus afraid of genetic variation.:innocent::face_with_monocle:
[09/03, 11:10 am] Arunan sir : May be you have to follow up more such fruits to see some of the nature into producing dry seeds. @⁨Theertha⁩
Please do not go by what you saw in a few flowers. @⁨Theertha⁩
For your comments.
[09/03, 11:14 am] Theertha: This is that photo of a mature fruit of Hibiscus.

while comparing to this photo ,the fruit size is small.So I felt ,what I got will be a developing fruit with immature seeds .
Your comment please @⁨Chithra Ma’am⁩
[09/03, 11:19 am] Arunan sir : On what basis are you comparing the size?:upside_down_face::face_with_hand_over_mouth: @⁨Theertha⁩

Does the arrow represent the immature seeds? @⁨Chithra Ma’am⁩ @⁨Vijaya Tilak CUBE⁩ and others.How to prove that it is seed not ovules or wise versa?
Photo: Theertha,CUBE Homelab Cherukkad Kozhikode .

[09/03, 9:03 pm] Chithra Ma’am: Why aren’t the immature seeds developing into mature seeds?
[09/03, 9:11 pm] Dinesh Datta CUBE: That looks like ovary.

Why are we calling it seeds?
[09/03, 10:31 pm] Chithra Ma’am: The question is - are those the immature seeds (fertilised ovules) or ovules (unfertilised) inside the ovary?
[10/03, 11:17 am] Theertha: Premature abortion!?

In stenospermocarpy, pollination and fertilization typically occur; however, the seed growth is prematurely aborted due to the cessation of seed coat and endosperm development, resulting in expanded fruit size with seminal rudiments or seed traces .

[10/03, 11:18 am] Theertha: How to prove this ?
[10/03, 11:18 am] Theertha: Two possibilities

  1. Premature abortion of seeds:
    In stenospermocarpy, pollination and fertilization typically occur; however, the seed growth is prematurely aborted due to the cessation of seed coat and endosperm development, resulting in expanded fruit size with seminal rudiments or seed traces.

  2. production of seedless fruit:
    In parthenocarpy, true seedlessness occurs, and the ovary develops into fruit independent of pollination and fertilization.
    Seedlessness Trait and Genome Editing—A Review - PMC

Objective: To differentiate between seeds and ovules present in the fruit.

Hypothesis: A will have seeds, and B will have ovules.

Control (A): A flower from the Hibiscus plant.
Test (B): I removed the developing anther from the flower and covered it with a transparent plastic cover.
Place:Cherukkad Kozhikode
Time:4.30pm
Photo: Theertha


Objective: To differentiate between seeds and ovules present in the fruit.
Hypothesis: A will have seeds, and B will have ovules.
Control (A): A flower from the Hibiscus plant.
Test (B): I removed the developing anther from the flower and covered it with a transparent plastic cover.
Place:Cherukkad Kozhikode
Time:4.30pm
Photo: Theertha

Updates :
Objective: To differentiate between seeds and ovules present in the fruit.
Test: Immature anthers are removed (to prevent selfpollination)and the flower is covered to prevent crosspollination.
Hypothesis: No fertilization will result in no fruit and no seeds.
Place:Cherukkad Kozhikode
Date:10/03/2025
Time:11am
Photo:Theertha


Updates :
Objective: To differentiate between seeds and ovules present in the fruit.
Control: The flower bud is left as such, the flower bloomed today.
Place:Cherukkad Kozhikode
Date:10/03/2025
Time:11am
Photo:Theertha


[09/03, 11:43 am] Vijaya Tilak CUBE: Theertha this is a normal hibiscus at home.
Is this normal ovary?
What can I expect tomorrow morning?
[09/03, 11:45 am] Theertha: Let’s follow up it tomorrow.

How many flower bud are there in this plant?

[09/03, 11:50 am] Vijaya Tilak CUBE: Others are very tiny.
I have four plants. I will check each one of them.
This is plant number 1

[10/03, 10:53 am] Vijaya Tilak CUBE: Day 2 of hibiscus flower
[10/03, 10:58 am] Vijaya Tilak CUBE: Petals with stigma separated from the flower. Is this the fruit?