The eggs of the apple snail <i>Pomacea maculata</i> are defended by indigestible polysaccharides and toxic proteins

The freshwater snails Pomacea lay conspicuous aerial eggs clutches that are ignored by most predators. Egg biochemical defenses in the apple snail P. canaliculata (Lamarck, 1822) are provided by multifunctional proteins. We analyzed the eggs of a sympatric species, P. maculata Perry,1810, studying t...

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Autores principales: Giglio, Matías Leonel, Ituarte, Santiago, Pasquevich, María Yanina, Heras, Horacio
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2016
Materias:
Ciencias Naturales
animal defense
egg composition
indigestible polysaccharide
protease inhibitors
antinutritive
antidigestive
apple snails
Pomacea maculata
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/127938
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-127938
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
animal defense
egg composition
indigestible polysaccharide
protease inhibitors
antinutritive
antidigestive
apple snails
Pomacea maculata
spellingShingle Ciencias Naturales
animal defense
egg composition
indigestible polysaccharide
protease inhibitors
antinutritive
antidigestive
apple snails
Pomacea maculata
Giglio, Matías Leonel
Ituarte, Santiago
Pasquevich, María Yanina
Heras, Horacio
The eggs of the apple snail <i>Pomacea maculata</i> are defended by indigestible polysaccharides and toxic proteins
topic_facet Ciencias Naturales
animal defense
egg composition
indigestible polysaccharide
protease inhibitors
antinutritive
antidigestive
apple snails
Pomacea maculata
description The freshwater snails Pomacea lay conspicuous aerial eggs clutches that are ignored by most predators. Egg biochemical defenses in the apple snail P. canaliculata (Lamarck, 1822) are provided by multifunctional proteins. We analyzed the eggs of a sympatric species, P. maculata Perry,1810, studying the gross composition, toxicity, hemagglutinating activity, as well as its antinutritive and antidigestive properties. Eggs are mostly composed of polysaccharides, mainly galactogen, and proteins, followed by lipids and non-soluble calcium. Two perivitellins account for ∼85 % dw of the egg protein. The major lipids are phospholipids and sterols. A suite of potential defenses were determined, including strong lethal neurotoxicity on mice and moderate antidigestive and lectin activities. Remarkably, their polysaccharides were refractive to in vitro digestion by digestive glycosidases. This study characterized ∼99% of egg composition and identified multiple potential defenses, provided not only by proteins but also polysaccharides. This is the first evidence to our knowledge that reserve sugars may be involved in defenses, giving further insight into the unusual reproductive strategy of these well defended snail eggs.
format Articulo
Preprint
author Giglio, Matías Leonel
Ituarte, Santiago
Pasquevich, María Yanina
Heras, Horacio
author_facet Giglio, Matías Leonel
Ituarte, Santiago
Pasquevich, María Yanina
Heras, Horacio
author_sort Giglio, Matías Leonel
title The eggs of the apple snail <i>Pomacea maculata</i> are defended by indigestible polysaccharides and toxic proteins
title_short The eggs of the apple snail <i>Pomacea maculata</i> are defended by indigestible polysaccharides and toxic proteins
title_full The eggs of the apple snail <i>Pomacea maculata</i> are defended by indigestible polysaccharides and toxic proteins
title_fullStr The eggs of the apple snail <i>Pomacea maculata</i> are defended by indigestible polysaccharides and toxic proteins
title_full_unstemmed The eggs of the apple snail <i>Pomacea maculata</i> are defended by indigestible polysaccharides and toxic proteins
title_sort eggs of the apple snail <i>pomacea maculata</i> are defended by indigestible polysaccharides and toxic proteins
publishDate 2016
url http://sedici.unlp.edu.ar/handle/10915/127938
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