Suppression of sugar accumulation in coleoptile and mesocotyl cells by light irradiation to etiolated maize seedlings

Soga-Morimoto, Aki; Soga, Kouichi; Wakabayashi, Kazuyuki; Kamisaka, Seiichiro; Hoson, Takayuki

doi:10.1016/j.jplph.2021.153409

Cited by 5 publications

(6 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Sucrose synthase (SS) and sucrose phosphate synthase (SPS) are the key enzymes in the sucrose synthesis pathway. In leaves, SPS plays a role as the limiting factor in the export of photoassimilates to sink tissues [ 29 , 31 , 46 – 49 ]. In this study, SPS and SS gene expression and sucrose synthase and sucrose phosphate synthase enzyme activity were inhibited under low light stress, so the sucrose and soluble sugar contents in cucumber leaves were significantly reduced.…”

Section: Discussionmentioning

confidence: 99%

Physiological mechanism of strigolactone enhancing tolerance to low light stress in cucumber seedlings

et al. 2022

View full text Add to dashboard Cite

Strigolactone is a newly discovered type of plant hormone that has multiple roles in modulating plant responses to abiotic stress. Herein, we aimed to investigate the effects of exogenous GR24 (a synthetic analogue of strigolactone) on plant growth, photosynthetic characteristics, carbohydrate levels, endogenous strigolactone content and antioxidant metabolism in cucumber seedlings under low light stress. The results showed that the application of 10 μM GR24 can increase the photosynthetic efficiency and plant biomass of low light-stressed cucumber seedlings. GR24 increased the accumulation of carbohydrates and the synthesis of sucrose-related enzyme activities, enhanced antioxidant enzyme activities and antioxidant substance contents, and reduced the levels of H2O2 and MDA in cucumber seedlings under low light stress. These results indicate that exogenous GR24 might alleviate low light stress-induced growth inhibition by regulating the assimilation of carbon and antioxidants and endogenous strigolactone contents, thereby enhancing the tolerance of cucumber seedlings to low light stress.

show abstract

Section: Discussionmentioning

confidence: 99%

Physiological mechanism of strigolactone enhancing tolerance to low light stress in cucumber seedlings

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The above results indicated that red, blue, and white light up- or down-regulated the expression of a large number of genes regulating cell wall organization and cytoskeleton in maize MES and COL, resulting in cell wall remodeling, lignification, changes in movement of microtubules, and inhibition of their plasticity elongation during maize germination. At the same time, light-induced changes interconnected phytohormones signaling ( Takahashi et al., 2012 ), sugar metabolism ( Soga-Morimoto et al., 2021 ), and circadian rhythm ( Harding et al., 2018 ) to form a complex regulatory network.…”

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…It is assumed that the amount of osmotic solutes, including sugar, in cells determines the amount of water uptake, thus controlling the rate of cell growth. Soga-Morimoto et al (2021) reported that sugar accumulation in maize MES and COL cells was reduced with subsequent suppression of cell growth when etiolated seedlings were subjected to white light irradiation. Kutschera and Niklas (2013) demonstrated that the hypocotyl growth of Helianthus annuus L. was associated with turgor-driven enlargement of cells in darkness and white light treatments, and the turgor maintenance during hypocotyl elongation was caused by sucrose catabolism, resulting in the generation of osmoregulant (such as monosaccharide).…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

New insights into light spectral quality inhibits the plasticity elongation of maize mesocotyl and coleoptile during seed germination

et al. 2023

View full text Add to dashboard Cite

The plastic elongation of mesocotyl (MES) and coleoptile (COL), which can be repressed by light exposure, plays a vital role in maize seedling emergence and establishment under adverse environmental conditions. Understanding the molecular mechanisms of light-mediated repression of MES and COL elongation in maize will allow us to develop new strategies for genetic improvement of these two crucial traits in maize. A maize variety, Zheng58, was used to monitor the transcriptome and physiological changes in MES and COL in response to darkness, as well as red, blue, and white light. The elongation of MES and COL was significantly inhibited by light spectral quality in this order: blue light > red light > white light. Physiological analyses revealed that light-mediated inhibition of maize MES and COL elongation was closely related to the dynamics of phytohormones accumulation and lignin deposition in these tissues. In response to light exposure, the levels of indole-3-acetic acid, trans-zeatin, gibberellin 3, and abscisic acid levels significantly decreased in MES and COL; by contrast, the levels of jasmonic acid, salicylic acid, lignin, phenylalanine ammonia-lyase, and peroxidase enzyme activity significantly increased. Transcriptome analysis revealed multiple differentially expressed genes (DEGs) involved in circadian rhythm, phytohormone biosynthesis and signal transduction, cytoskeleton and cell wall organization, lignin biosynthesis, and starch and sucrose metabolism. These DEGs exhibited synergistic and antagonistic interactions, forming a complex network that regulated the light-mediated inhibition of MES and COL elongation. Additionally, gene co-expression network analysis revealed that 49 hub genes in one and 19 hub genes in two modules were significantly associated with the elongation plasticity of COL and MES, respectively. These findings enhance our knowledge of the light-regulated elongation mechanisms of MES and COL, and provide a theoretical foundation for developing elite maize varieties with improved abiotic stress resistance.

show abstract

“…However, Soga et al (2021) in their studies showed the decrease in sugar content in coleoptiles and mesocotyls and inhibited the growth of both organs when etiolated maize seedlings were subjected to light irradiation. Thus, the phenomena induced by light were opposite to those induced by gibberellins [ 127 , 128 , 129 ]. Hoson (1999) proposed that light acts as a gravity-substituting factor in growth regulation, because many mechanisms for growth regulation by light and gravity are common.…”

Section: Maize ( Zea Mays L)mentioning

confidence: 99%

Primary Root and Mesocotyl Elongation in Maize Seedlings: Two Organs with Antagonistic Growth below the Soil Surface

Rodríguez

Cassab

2021

Plants

View full text Add to dashboard Cite

Maize illustrates one of the most complex cases of embryogenesis in higher plants that results in the development of early embryo with distinctive organs such as the mesocotyl, seminal and primary roots, coleoptile, and plumule. After seed germination, the elongation of root and mesocotyl follows opposite directions in response to specific tropisms (positive and negative gravitropism and hydrotropism). Tropisms represent the differential growth of an organ directed toward several stimuli. Although the life cycle of roots and mesocotyl takes place in darkness, their growth and functions are controlled by different mechanisms. Roots ramify through the soil following the direction of the gravity vector, spreading their tips into new territories looking for water; when water availability is low, the root hydrotropic response is triggered toward the zone with higher moisture. Nonetheless, there is a high range of hydrotropic curvatures (angles) in maize. The processes that control root hydrotropism and mesocotyl elongation remain unclear; however, they are influenced by genetic and environmental cues to guide their growth for optimizing early seedling vigor. Roots and mesocotyls are crucial for the establishment, growth, and development of the plant since both help to forage water in the soil. Mesocotyl elongation is associated with an ancient agriculture practice known as deep planting. This tradition takes advantage of residual soil humidity and continues to be used in semiarid regions of Mexico and USA. Due to the genetic diversity of maize, some lines have developed long mesocotyls capable of deep planting while others are unable to do it. Hence, the genetic and phenetic interaction of maize lines with a robust hydrotropic response and higher mesocotyl elongation in response to water scarcity in time of global heating might be used for developing more resilient maize plants.

show abstract

Suppression of sugar accumulation in coleoptile and mesocotyl cells by light irradiation to etiolated maize seedlings

Cited by 5 publications

References 26 publications

Physiological mechanism of strigolactone enhancing tolerance to low light stress in cucumber seedlings

Physiological mechanism of strigolactone enhancing tolerance to low light stress in cucumber seedlings

New insights into light spectral quality inhibits the plasticity elongation of maize mesocotyl and coleoptile during seed germination

Primary Root and Mesocotyl Elongation in Maize Seedlings: Two Organs with Antagonistic Growth below the Soil Surface

Contact Info

Product

Resources

About