3EBIO Climaco-Natividad-Sy PlantArea Bicol by Chel Natividad https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q Let's explore the world of seeds! en-us 2021-05-18 01:01:47 UTC 2024-11-13 08:02:27 UTC hello@padlet.com Chellynatividad https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1533680201 2021-05-18 01:18:03 UTC https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1533680201 Seed Bank-Philippines Chellynatividad https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1533682740 "One of the most memorable voices" during the first global seed vault seminar, representative for Philippines
     - Eulogio "Tay Gipo" Sasi Jr.
     - requested to join a research institute to learn rice breeding and improved the "Bordagol" rice variety he discovered

]]> 2021-05-18 01:18:55 UTC https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1533682740 Embryogenesis in Plants alyssanicole_sy_sci https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1551518678
Zygotic embryogenesis 
  • This occurs when a zygotic embryo is formed following double fertilization of the ovule.
  • This, then, give rise to the plant embryo and the endosperm which together go on to develop in the seed. 

Stages of Embryonic Development

A. Eudicot
  • After fertilization, zygote of a eudicot plant divides to form two cells, the apical cell (upper) and basal cell (lower).
  • The division of basal cell gives rise to the suspensor while the division of apical cell gives rise to the proembryo.
  • As the proembryo continues to divide, it forms a spherical and is called the globular stage (considered embryo proper).
  • This embryo proper, then, gives rise to the cotyledon forming the heart stage.
  • As the cotyledon continues to elongate, the base of the embryo thickens which results to a torpedo stage (where most of the suspensor deteriorates).
  • Finally, the final stage of embryogenesis results in the mature embryo wherein it includes a radicle (embryonic root). 

Note: After the final stage, embryo becomes dormant and growth resumes when the seed germinates and develops into a seedling.

B. Monocot
  • Process of embryogenesis is similar with eudicot but differs in a way that there is no heart stage since there is only one cotyledon.
]]> 2021-05-23 16:26:18 UTC https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1551518678 alyssanicole_sy_sci https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1551522516 "Put your seed in the soil, no matter the dormancy period, with faith, there surely be germination"
- Ernest Agyemang Yeboah]]> 2021-05-23 16:30:17 UTC https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1551522516 Seed Dormancy alyssanicole_sy_sci https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1551605796 2021-05-23 17:46:56 UTC https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1551605796 Seed Dormancy alyssanicole_sy_sci https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1553939031
  • Bentsink, L., & Koornneef, M. (2008). Seed dormancy and germination. The arabidopsis book, 6, e0119. https://doi.org/10.1199/tab.0119
  • Yildiz, M. et al. ( 2017). Seed Dormancy, Advances in Seed Biology, Jose C. Jimenez-Lopez, IntechOpen. doi: 10.5772/intechopen.70571. Available from: https://www.intechopen.com/books/advances-in-seed-biology/seed-dormancy
    • ]]>     2021-05-24 14:45:14 UTC https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1553939031     Chellynatividad https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1555288016 SEED BANK
    • Charles, D. (2006). SPECIES CONSERVATION: A “Forever” Seed Bank Takes Root in the Arctic. Science, 312(5781), 1730b–1731b. doi:10.1126/science.312.5781.1730b
    • Kiss, R., Tothmeresz, B. & Torok, P. In: Seed Banks: Types, Roles and Research (2017). Seed Bank Research in Central-European Grasslands- An Overview- Chapter 1. Nova Science Publishers Inc. ISBN: 978-1-53610-388-5

    SEED BANK CONTRIBUTION
    • http://legacy.senate.gov.ph/lisdata/104729349!.pdf
    • https://www.gmanetwork.com/news/news/content/150667/pinoy-honored-in-global-seed-vault-anniversary-celebration/story/
    ]]>     2021-05-24 20:35:55 UTC https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1555288016     Embryogenesis josalynclimacosci https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1561757191 2021-05-26 15:11:13 UTC https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1561757191 Stages/ Phases of Seed Germination alyssanicole_sy_sci https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1561828118 1. Water Imbibition (1st step of germination)
    Definition: 
    • uptake of water by dry seeds leads to swelling and breaking of the seed coat
    Mechanism: 
    • accomplished due to the rehydration of structural and storage macromolecules (storage polysaccharides and proteins)
    • This step stimulates the embryo, with the help of reserve substances, to produce phytohormones such as gibberellic acid (GA)
    • The GA can diffuse to aleurone  layer and initiate a signaling cascade which then result in the synthesis of α-amylases and other hydrolytic enzymes.
    • As water is imbibed by seeds, metabolic processes initiate with an increase in respiration rate. 

    2. Mobilization of food reserve and protein synthesis
    Mechanism:
    • Food reserve (such as starch and proteins) is hydrolyzed when hydrolytic enzymes produced during water imbibition secretes into the endosperm.
    • Food reserves may be stored in the endosperm (monocotyledon such as cereal grains and castor) or the cotyledon (dicotyledon such as peas and beans), depending on the nature of seed.  

    3. Formation of Root and Shoot
    • radicle protrusion
    • plumule develops into shoot

    3. Formation of Seedling
    • completion of germination
    • first embryonic leaf or cotyledon appears
    ]]>     2021-05-26 15:27:36 UTC https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1561828118     TROPISMS IN PLANTS alyssanicole_sy_sci https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1561840133 Seeds require darkness to germinate but sometimes it also requires light. 

    A. Phototropism
    • directional response that enables plants to bend or grow  towards a light source.

    Photoblastic 
    - seed which respond to light for their germination are named as photoblastic.

    3 categories of Photoblastic

    1. Positive photoblastic
    • (lettuce, tobacco, mistletoe, etc.) do not germinate in darkness but require exposure to sunlight (may be for a brief period) for germination.
    2. Negative Photoblastic
    • (onion, lily, Amaranthus, Nigella, etc.) do not germinate if exposed to sunlight. 
    3. Non-photoblastic
    • germinate irrespective of the presence (exposure) or absence (non-exposure) of light.

    Note: In light sensitive seeds, the most effective visible spectrum for germination is the red region since the far-red region reverses the effect of red light which makes the seed dormant. These sensitivity of the seed is due to the presence of phytochrome, a blue-coloured photoreceptor pigment. It is a phycobiloprotein and is widely distributed in plants.

    B. Gravitropism/Geotropism
    • response to gravity

    C. Hydrotropism
    • response to water

    D. Thigmotropism
    • response to mechanical stimulation

    E. Chemotropism
    • response to a chemical stimulus
    ]]>     2021-05-26 15:30:26 UTC https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1561840133     Seed Germination alyssanicole_sy_sci https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1561892808
  • Ali, A.S. & Elozeiri, A.A. (2017). Metabolic Processes During Seed Germination, Advances in Seed Biology, Jose C. Jimenez-Lopez, IntechOpen, doi: 10.5772/intechopen.70653. Available from: https://www.intechopen.com/books/advances-in-seed-biology/metabolic-processes-during-seed-germination
    • ]]>     2021-05-26 15:43:00 UTC https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1561892808     Seeds in Bicol josalynclimacosci https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1561963324 2021-05-26 15:59:49 UTC https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1561963324 Bicol, Philippines josalynclimacosci https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1561970085
  • Balala, C. E. (2020). 'Plant, Plant, Plant' program boosts agri commodities in Bicol. Retrieved from https://pia.gov.ph/news/articles/1052414


    • Guiriba, Glenton O. (2019). OCUMENTATION OF INDIGENOUS KNOWLEDGE ON PRODUCTION AND POST-HARVEST MANAGEMENT OF SWEET POTATO IN THE BICOL REGION, PHILIPPINES. Journal of Asian Rural Studies, 3(1):93. DOI:10.20956/jars.v3i1.1719



    ]]>     2021-05-26 16:01:14 UTC https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1561970085     Embryogenesis alyssanicole_sy_sci https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1561996769 Harada, J.J., Belmonte, M.F. & Kwong, R.W. (2010). Plant Embryogenesis (Zygotic and Somatic). Online Wiley library. https://doi.org/10.1002/9780470015902.a0002042.pub2

    Su, Y.H. et al. (2015). Establishment of embryonic shoot-root axis is involved in auxin and cytokinin response during Arabidopsis somatic embryogenesis. Front. Plant Sci. https://doi.org/10.3389/fpls.201400792]]>     2021-05-26 16:07:17 UTC https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1561996769     Seed Germination alyssanicole_sy_sci https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1562606586 2021-05-26 18:44:44 UTC https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1562606586 alyssanicole_sy_sci https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1562615103 "An infinity of forest lies dormant within the dreams on one acorn"
    - Wayne Dyer]]>     2021-05-26 18:47:20 UTC https://padlet.com/Chellynatividad/x0ejw3t1wd7ja03q/wish/1562615103