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<p>Mucilage, a complex hydrated polysaccharide matrix is extruded upon seed hydration (called myxospermy) in many angiosperms. It facilitates critical ecological and physiological functions like germination, enhancement of seed dispersal, maintaining hydration, etc. One of the significant commercial sources of mucilage is <i>Plantago</i> <i>ovata</i> that has been valued for its tremendous medicinal and industrial applications. Latterly, efforts have been made to elucidate the mucilage pathway in <i>Arabidopsis thaliana, Plantago ovata</i> and other myxospermous plants. These studies have highlighted that compositional variation in the mucilage derived from different plants leads to variable gel-forming and hydrocolloid properties. Unlike, <i>Arabidopsis</i> mucilage which is predominantly composed of pectin, mucilage in <i>Plantago</i> is made up of hemicellulose while in other plants mucilage has both pectin and hemicellulose. In <i>Arabidopsis thaliana</i>, the differentiation of mucilage secretory cells in the seed coat is well documented unraveling the intricate process of cell expansion, pectin biosynthesis, secretion, <i>in muro</i> pectin modification and secondary cell wall synthesis along with the involvement of several regulatory genes and enzymes. Although, substantial amount of information has become available for this model plant, yet mucilage biosynthetic pathway still awaits to be elucidated fully, along with the identification of additional genes and the related processes. <i>P</i>. <i>ovata</i> produces more and slightly larger seeds with 20-30% mucilage by dry weight than <i>A</i>. <i>thaliana</i>, rendering it a valuable model species for assessment of genetic and chemical basis of mucilage synthesis. The information available so far has been compiled with emerging insights on the dynamics of the mucilage synthesis process in different model plants. This article aligns with SDG 2 (Zero Hunger) of the UN Agenda for Sustainable Development.</p>

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Genetics behind sticky seeds: decoding seed coat mucilage in some myxospermous plants

  • 期刊论文

  • 发表日期：

    2026年5月14日

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  • Tanushri Sharma,
  • Shivanjali Kotwal,
  • Sanjana Kaul,
  • Manoj Kumar Dhar

摘要

Mucilage, a complex hydrated polysaccharide matrix is extruded upon seed hydration (called myxospermy) in many angiosperms. It facilitates critical ecological and physiological functions like germination, enhancement of seed dispersal, maintaining hydration, etc. One of the significant commercial sources of mucilage is Plantago ovata that has been valued for its tremendous medicinal and industrial applications. Latterly, efforts have been made to elucidate the mucilage pathway in Arabidopsis thaliana, Plantago ovata and other myxospermous plants. These studies have highlighted that compositional variation in the mucilage derived from different plants leads to variable gel-forming and hydrocolloid properties. Unlike, Arabidopsis mucilage which is predominantly composed of pectin, mucilage in Plantago is made up of hemicellulose while in other plants mucilage has both pectin and hemicellulose. In Arabidopsis thaliana, the differentiation of mucilage secretory cells in the seed coat is well documented unraveling the intricate process of cell expansion, pectin biosynthesis, secretion, in muro pectin modification and secondary cell wall synthesis along with the involvement of several regulatory genes and enzymes. Although, substantial amount of information has become available for this model plant, yet mucilage biosynthetic pathway still awaits to be elucidated fully, along with the identification of additional genes and the related processes. P. ovata produces more and slightly larger seeds with 20-30% mucilage by dry weight than A. thaliana, rendering it a valuable model species for assessment of genetic and chemical basis of mucilage synthesis. The information available so far has been compiled with emerging insights on the dynamics of the mucilage synthesis process in different model plants. This article aligns with SDG 2 (Zero Hunger) of the UN Agenda for Sustainable Development.