# Radicle

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Radicle forms the future root

Not to be confused with [Radical](/source/Radical_(disambiguation)), or the album [The Radicle](/source/The_Radicle).

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Seed of Scouler's willow (*[Salix scouleriana](/source/Salix_scouleriana)*)

In [botany](/source/Botany), the **radicle** is the first part of a [seedling](/source/Seedling) to emerge from the [seed](/source/Seed), during the process of [germination](/source/Germination).[1] Germination understood as a [biomechanical](/source/Biomechanics) process describes the radicle with the [hypocotyl](/source/Hypocotyl) combined as the embryonic axis in the seed.[2] The radicle emerges from a seed through the [micropyle](/source/Ovule#Integuments,_micropyle_and_chalaza).

The emergence of the radicle is either the end or terminal part [3] (2nd of 2 phases [4] (or) 3rd of 3 phases [5][6]) or the 5th of 9 stages [7][a] of germinating.

The radicle is the embryonic [root](/source/Root) of the plant,[1] and grows downward in the soil [8] (positive [geotropism](/source/Geotropism)).[9] The radicle absorbs water and nutrients from the soil [10]

Radicles are classified into two main types. Those pointing away from the seed coat scar or [hilum](/source/Hilum_(biology)) are classified as *antitropous*, and those pointing towards the hilum are *syntropous*.

If the radicle begins to decay, the seedling undergoes pre-emergence [damping off](/source/Damping_off). This disease appears on the radicle as darkened spots. Eventually, it causes death of the seedling.

In 1880, [Charles Darwin](/source/Charles_Darwin) published a book about plants he had studied, [The Power of Movement in Plants](/source/The_Power_of_Movement_in_Plants), where he mentions the radicle.

It is hardly an exaggeration to say that the tip of the radicle thus endowed [..] acts like the brain of one of the lower animals; the brain being situated within the anterior end of the body, receiving impressions from the sense-organs, and directing the several movements.

## See also

- [Plant perception (physiology)](/source/Plant_perception_(physiology))

## Note

1. **[^](#cite_ref-8)** within the [BBCH-scale](/source/BBCH-scale)[7]

## References

1. ^ [***a***](#cite_ref-FreeWatters_1-0) [***b***](#cite_ref-FreeWatters_1-1) Mary Free; Christa Watters (November 2024). ["New to the Glossary: Root, Radicle, Primary Root"](https://mgnv.org/illustrated-glossary/new-to-the-glossary-root-radicle-primary-root/). *mgnv.org*. [Virginia Cooperative Extension](/source/Virginia_Cooperative_Extension): [Virginia Tech](/source/Virginia_Tech), [Virginia State University](/source/Virginia_State_University), [U.S. Department of Agriculture](/source/U.S._Department_of_Agriculture).

1. **[^](#cite_ref-2)** Tina Steinbrecher; Gerhard Leubner-Metzger (1 Feb 2017). ["The biomechanics of seed germination"](https://pubmed.ncbi.nlm.nih.gov/27927995/https://pubmed.ncbi.nlm.nih.gov/27927995/). *[J Exp Bot](/source/J_Exp_Bot)*. **68** (4): Abstract. [doi](/source/Doi_(identifier)):[10.1093/jxb/erw428](https://doi.org/10.1093%2Fjxb%2Ferw428). [PMID](/source/PMID_(identifier)) [27927995](https://pubmed.ncbi.nlm.nih.gov/27927995).

1. **[^](#cite_ref-3)** Kent J. Bradford (4 January 1995). ["Water Relations in Seed Germination"](https://books.google.com/books?id=AHVDtveqlpMC). In Gad Galili; Jaime Kigel (eds.). *Seed Development and Germination Volume 41*. [Taylor & Francis](/source/Taylor_%26_Francis). p. 355 (E.Hydration/Dehydration Cycles). [ISBN](/source/ISBN_(identifier)) [9780824792299](https://en.wikipedia.org/wiki/Special:BookSources/9780824792299).

1. **[^](#cite_ref-4)** Lalit M. Srivastava (2002). ["Seed Germination, Mobilization of Food Reserves, and Seed Dormancy"](https://books.google.com/books?id=wXLBKdncciQC&dq=plant+germination+radicle&pg=PA449). *Plant Growth and Development Hormones and Environment*. [Academic Press](/source/Academic_Press). pp. 448–449 (Section I. Seed Germnation 1. Imbibition of Water 2. Radicle Growth and Penetration of Testa). [ISBN](/source/ISBN_(identifier)) [9780080514031](https://en.wikipedia.org/wiki/Special:BookSources/9780080514031).

1. **[^](#cite_ref-5)** Edward Francis Durner (2013). ["Physiology of Growth in Specific Organs: Flowers, Fruit, and Seeds"](https://books.google.com/books?id=oc9mQU3Z0AAC&dq=germination+radicle&pg=PA81). *Principles of Horticultural Physiology*. [CABI](/source/Centre_for_Agriculture_and_Bioscience_International). p. 80 (*Imbibition*). [ISBN](/source/ISBN_(identifier)) [9781780643069](https://en.wikipedia.org/wiki/Special:BookSources/9781780643069). Water imbibition is the first step of germination (Nonogaki et al. 2010). Water uptake by seeds is triphasic. There is a rapid initial uptake of water (phase I) followed by a plateau phase (phase II). A third phase (phase III) involves the rapid uptake of water with elongation of the embryonic axis which results in radicle emergence and the completion of germination.

1. **[^](#cite_ref-6)** Choi, J.-Y.; Ju, Y.-H.; Nakamichi, A.; Cho, S.-W.; Woo, S.-H.; Sakagami, J.-I. (2024). ["Effect of Seed Hydropriming on the Elongation of Plumule and Radicle During the Germination Process and Changes in Enzyme Activity Under Water-Deficient Conditions: 1. Introduction"](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11679898). *[Plants](/source/Plants_(journal))*. **13** (3537). [MDPI](/source/MDPI). [doi](/source/Doi_(identifier)):[10.3390/plants13243537](https://doi.org/10.3390%2Fplants13243537). [PMC](/source/PMC_(identifier)) [11679898](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11679898).

1. ^ [***a***](#cite_ref-FerreiraMartinsCosta_7-0) [***b***](#cite_ref-FerreiraMartinsCosta_7-1) Mábele de Cássia Ferreira; Fabrina Bolzan Martins; Haroldo Felipe da Costa (22 October 2025). ["Phenological description for the initial development stage of five Brazilian native forest species according to BBCH scale - 2.2 Adapting the BBCH scale for five native Brazilian forest species TABLE 3"](https://onlinelibrary.wiley.com/doi/10.1111/aab.70071). *[Annals of Applied Biology](/source/Annals_of_Applied_Biology)*. [John Wiley & Sons, Inc](/source/John_Wiley_%26_Sons%2C_Inc). [doi](/source/Doi_(identifier)):[10.1111/aab.70071](https://doi.org/10.1111%2Faab.70071).

1. **[^](#cite_ref-9)** ["radicle | plant anatomy"](https://www.britannica.com/science/radicle). *[Encyclopedia Britannica](/source/Encyclopedia_Britannica)*. Retrieved 2017-12-11.

1. **[^](#cite_ref-10)** Herbert Edward Street; Helgi Öpik (1976). ["Chapter 1: The Plant and Its Environment"](https://books.google.com/books?id=2JEpAQAAMAAJ&q=radicle+geotropic). *The Physiology of Flowering Plants Their Growth and Development*. [Edward Arnold](/source/Edward_Arnold_(publisher)). p. 12. [ISBN](/source/ISBN_(identifier)) [9780713125283](https://en.wikipedia.org/wiki/Special:BookSources/9780713125283).

1. **[^](#cite_ref-11)** Molly Jameson (February 1, 2024). ["The Science of Germination"](https://nwdistrict.ifas.ufl.edu/hort/2024/02/01/the-science-of-germination/). *[Institute of Food and Agricultural Sciences](/source/Institute_of_Food_and_Agricultural_Sciences): Northwest Extension District - [University of Florida](/source/University_of_Florida)*. [Wordpress](/source/Wordpress). [Archived](https://web.archive.org/web/20250811114515/https://nwdistrict.ifas.ufl.edu/hort/2024/02/01/the-science-of-germination/) August 11, 2025, at the [Wayback Machine](/source/Wayback_Machine)

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