Plant Responses to Gravity, Microgravity, and Space Environment

A special issue of Plants (ISSN 2223-7747). This special issue belongs to the section "Plant Response to Abiotic Stress and Climate Change".

Deadline for manuscript submissions: closed (17 June 2022) | Viewed by 5900

Special Issue Editor


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Guest Editor
Faculty of Human Life Sciences, Hagoromo University of International Studies, Hamadera-minamimachi, Sakai 592-8344, Osaka, Japan
Interests: gravity sensing; calcium signaling; ROS signaling; calcium–ROS networks; ion channels; mechanosensors; protein kinases; long-distance signals

Special Issue Information

Dear Colleagues,

Gravity is a ubiquitous force on Earth affecting morphogenesis in plants and animals to help them to support their own weight, as evidenced in the fact that, for example, most plants on Earth grow shoots upwards and roots downwards. The upward bending of coleoptiles and stems of horizontally reoriented plants, known as gravitropism, is the most common event visualizing the effect of gravity on organisms. Plant gravitropism is a mysterious phenomenon that has attracted attention since ancient times.

In order to clarify how plants are able to sense gravity and the underlying mechanisms of gravitropism, a number of studies have been conducted on numerous plant species, suggesting that plants can sense both the direction and intensity of gravity through asymmetric auxin transport, morphological responses, changes in gene expression, and the evocation of intracellular signaling events. It is notable that studies in microgravity and hypergravity conditions have cast light on new phenomena such as hydrotropism that are not generally possible on Earth due to gravity. Furthermore, studies in spacecrafts and space stations have revealed that such environments strongly affect plant growth and development through, for instance, cosmic rays, loss of heat convection. and high CO2 elevated by the crew’s exhalation.

As our fundamental understanding of the effect of gravity, microgravity, and space environments on plants has broadened, we have also come to realize that much remains to be discovered. This Special Issue will highlight the roles of molecules, mechanisms, and systems involved in gravisensing, gravitropism, gravimorphoenesis, and adaptation to space environments at the molecular, cellular, and tissue levels, as well as the whole plant level, and systems that materialize sustainable food production in bases on the Moon and Mars.

Prof. Dr. Takuya Furuichi
Guest Editor

Manuscript Submission Information

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Keywords

  • gravimorphogenesis
  • gravitropism
  • gravity sensors
  • space farming
  • space stress
  • CELSS (controlled ecological life-support system)
  • agricultural environmental engineering

Published Papers (2 papers)

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12 pages, 1344 KiB  
Article
Suppression of Cortical Microtubule Reorientation and Stimulation of Cell Elongation in Arabidopsis Hypocotyls under Microgravity Conditions in Space
by Shiho Kato, Mana Murakami, Ryo Saika, Kouichi Soga, Kazuyuki Wakabayashi, Hirofumi Hashimoto, Sachiko Yano, Shohei Matsumoto, Haruo Kasahara, Motoshi Kamada, Toru Shimazu, Takashi Hashimoto and Takayuki Hoson
Plants 2022, 11(3), 465; https://doi.org/10.3390/plants11030465 - 08 Feb 2022
Cited by 6 | Viewed by 2383
Abstract
How microgravity in space influences plant cell growth is an important issue for plant cell biology as well as space biology. We investigated the role of cortical microtubules in the stimulation of elongation growth in Arabidopsis (Arabidopsis thaliana) hypocotyls under microgravity [...] Read more.
How microgravity in space influences plant cell growth is an important issue for plant cell biology as well as space biology. We investigated the role of cortical microtubules in the stimulation of elongation growth in Arabidopsis (Arabidopsis thaliana) hypocotyls under microgravity conditions with the Resist Tubule space experiment. The epidermal cells in the lower half of the hypocotyls of wild-type Columbia were longer in microgravity than at on-orbit 1 g, which precipitated an increase in the entire hypocotyl length. In the apical region, cortical microtubules adjacent to the outer tangential wall were predominantly transverse to the long axis of the cell, whereas longitudinal microtubules were predominant in the basal region. In the 9th to 12th epidermal cells (1 to 3 mm) from the tip, where the modification of microtubule orientation from transverse to longitudinal directions (reorientation) occurred, cells with transverse microtubules increased, whereas those with longitudinal microtubules decreased in microgravity, and the average angle with respect to the transverse cell axis decreased, indicating that the reorientation was suppressed in microgravity. The expression of tubulin genes was suppressed in microgravity. These results suggest that under microgravity conditions, the expression of genes related to microtubule formation was downregulated, which may cause the suppression of microtubule reorientation from transverse to longitudinal directions, thereby stimulating cell elongation in Arabidopsis hypocotyls. Full article
(This article belongs to the Special Issue Plant Responses to Gravity, Microgravity, and Space Environment)
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8 pages, 1135 KiB  
Brief Report
Entanglement of Arabidopsis Seedlings to a Mesh Substrate under Microgravity Conditions in KIBO on the ISS
by Masataka Nakano, Takuya Furuichi, Masahiro Sokabe, Hidetoshi Iida, Sachiko Yano and Hitoshi Tatsumi
Plants 2022, 11(7), 956; https://doi.org/10.3390/plants11070956 - 31 Mar 2022
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Abstract
The International Space Station (ISS) provides a precious opportunity to study plant growth and development under microgravity (micro-G) conditions. In this study, four lines of Arabidopsis seeds (wild type, wild-type MCA1-GFP, mca1-knockout, and MCA1-overexpressed) were cultured on a nylon [...] Read more.
The International Space Station (ISS) provides a precious opportunity to study plant growth and development under microgravity (micro-G) conditions. In this study, four lines of Arabidopsis seeds (wild type, wild-type MCA1-GFP, mca1-knockout, and MCA1-overexpressed) were cultured on a nylon lace mesh placed on Gelrite-solidified MS-medium in the Japanese experiment module KIBO on the ISS, and the entanglement of roots with the mesh was examined under micro-G and 1-G conditions. We found that root entanglement with the mesh was enhanced, and root coiling was induced under the micro-G condition. This behavior was less pronounced in mca1-knockout seedlings, although MCA1-GFP distribution at the root tip of the seedlings was nearly the same in micro-G-grown seedlings and the ground control seedlings. Possible involvement of MCA1 in the root entanglement is discussed. Full article
(This article belongs to the Special Issue Plant Responses to Gravity, Microgravity, and Space Environment)
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