A Re-examination of the Root Cortex in Wetland Flowering Plants With Respect to Aerenchyma

Seago, James L.; Marsh, Leland C.; Stevens, Kenneth N.; Soukup, Aleš; Votrubová, Olga; Enstone, Daryl E.

doi:10.1093/aob/mci211

Cited by 169 publications

(144 citation statements)

References 60 publications

(101 reference statements)

Supporting

Mentioning

128

Contrasting

Unclassified

Order By: Relevance

“…This radial arrangement favors aerenchyma formation in roots (Seago et al 2005), corroborating what has been described in the species studied here and in other Cyperaceae and monocotyledons (Rodrigues and Estelita 2004, Menezes et al 2005, Seago et al 2005, Leite et al 2009). …”

Section: Discussionsupporting

confidence: 90%

Developmental anatomy of Cyperus laxus (non-Nranz) and Fimbristylis dichotoma (Kranz) (Cyperaceae, Poales) and tissue continuity

Martins

Scatena

2013

An. Acad. Bras. Ciênc.

View full text Add to dashboard Cite

The Cyperaceae species are present in different ecosystems and constitute the herbaceous extract. Of the approximately 5,500 species of the family; a third has Kranz anatomy, representing an important characteristic of the taxonomy and phylogeny of the group. In Cyperus laxus L. (non-Kranz) and Fimbristylis dichotoma Vahl (Kranz), development begins with germination that is marked by the emergence of the coleoptiles, followed by the primary root, which is ephemeral. The rhizome originates from the mesocotyl and it promotes the vascular connection between the roots, leaves and scapes. The continuity of the tissues is evidenced by the presence of an endodermis and pericycle in all vegetative organs. Leaves and scapes differ between the two species by the arrangement of mesophyll cells, which is regular in Cyperus laxus (non-Kranz) and arranged radially in Fimbristylis dichotoma (Kranz). Also differ in the number of bundles sheaths: two in Cyperus laxus (non-Kranz) and three in Fimbristylis dichotoma (Kranz). The outer bundle sheath in both species constitutes the endodermis, and the inner sheath in Cyperus laxus and the middle and inner sheaths in Fimbristylis dichotoma constitute the pericycle.

show abstract

Section: Discussionsupporting

confidence: 90%

Developmental anatomy of Cyperus laxus (non-Nranz) and Fimbristylis dichotoma (Kranz) (Cyperaceae, Poales) and tissue continuity

Martins

Scatena

2013

An. Acad. Bras. Ciênc.

View full text Add to dashboard Cite

show abstract

“…Many wetland and aquatic species form primary aerenchymatous tissue by cell separation (schizogeny), differential expansion (expansigeny), or programmed cell death (lysigeny; Seago et al, 2005). Lysigenous aerenchyma can be formed constitutively in the root cortex, as observed in lowland rice, or can be induced by flooding, as seen in barley (Hordeum vulgare), maize, and wheat.…”

Section: Morphological and Anatomical Adaptations That Increase Floodmentioning

confidence: 99%

Waterproofing Crops: Effective Flooding Survival Strategies

2012

View full text Add to dashboard Cite

“…But, in the roots of E. crassipes this system was only slightly stimulated. The lysigenous aerenchyma is dependent of the production of reactive oxygen species (Seago et al 2005, Gunawardena 2008, and in water Consequently, a reduced antioxidant enzyme activity in the roots can be related to the maintenance of the aerenchyma proportion.…”

Section: )mentioning

confidence: 99%

Lead tolerance of water hyacinth (Eichhornia crassipes Mart. - Pontederiaceae) as defined by anatomical and physiological traits

Pereira

Castro

Oliveira

et al. 2014

An. Acad. Bras. Ciênc.

View full text Add to dashboard Cite

This study aimed at verifying the lead tolerance of water hyacinth and at looking at consequent anatomical and physiological modifications. Water hyacinth plants were grown on nutrient solutions with five different lead concentrations: 0.00, 0.50, 1.00, 2.00 and 4.00 mg L -1 by 20 days. Photosynthesis, transpiration, stomatal conductance and the Ci/Ca rate were measured at the end of 15 days of experiment. At the end of the experiment, the anatomical modifications in the roots and leaves, and the activity of antioxidant system enzymes, were evaluated. Photosynthetic and Ci/Ca rates were both increased under all lead treatments. Leaf anatomy did not exhibit any evidence of toxicity effects, but showed modifications of the stomata and in the thickness of the palisade and spongy parenchyma in the presence of lead. Likewise, root anatomy did not exhibit any toxicity effects, but the xylem and phloem exhibited favorable modifications as well as increased apoplastic barriers. All antioxidant system enzymes exhibited increased activity in the leaves, and some modifications in roots, in the presence of lead. It is likely, therefore, that water hyacinth tolerance to lead is related to anatomical and physiological modifications such as increased photosynthesis and enhanced anatomical capacity for CO 2 assimilation and water conductance.

show abstract

A Re-examination of the Root Cortex in Wetland Flowering Plants With Respect to Aerenchyma

Abstract: We conclude that expansigeny is the basic type of aerenchyma development in roots of flowering plants and that the presence of expansigenous honeycomb aerenchyma in root cortices was fundamental to the success of the earliest flowering plants found in wetland environments.

Cited by 169 publications

References 60 publications

Developmental anatomy of Cyperus laxus (non-Nranz) and Fimbristylis dichotoma (Kranz) (Cyperaceae, Poales) and tissue continuity

Developmental anatomy of Cyperus laxus (non-Nranz) and Fimbristylis dichotoma (Kranz) (Cyperaceae, Poales) and tissue continuity

Waterproofing Crops: Effective Flooding Survival Strategies

Lead tolerance of water hyacinth (Eichhornia crassipes Mart. - Pontederiaceae) as defined by anatomical and physiological traits

Contact Info

Product

Resources

About