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A leptoid is a type of elongated food-cond … A leptoid is a type of elongated food-conducting cell like phloem in the stems of some mosses, such as the family Polytrichaceae. They surround strands of water-conducting hydroids. They have some structural and developmental similarities to the sieve elements of seedless vascular plants. At maturity they have inclined end cell walls with small pores and degenerate nuclei. The conduction cells of mosses, leptoids and hydroids, appear similar to those of fossil protracheophytes. However they're not thought to represent an intermediate stage in the evolution of plant vascular tissues but to have had an independent evolutionary origin.ve had an independent evolutionary origin.
, Um leptóide é um tipo de célula condutora … Um leptóide é um tipo de célula condutora que existe nos caulídios de alguns musgos, tal como na família Polytrichaceae. Rodeiam fileiras de hidróides condutores de água. Possuem semelhanças estruturais e desenvolvimentais com os elementos de tubo de plantas vasculares sem sementes. Quando maturas possuem paredes celulares no ápice inclinadas, com pequenos poros e núcleos degenerados. As células condutores dos musgos, os leptóides e hidróides, parecem semelhantes às dos protraqueófitos. No entanto, parecem não ser um estágio intermédio na evolução dos tecidos vasculares das plantas, mas sim uma origem evolutiva independente.mas sim uma origem evolutiva independente.
, Leptoidy – komórki przystosowane do przewo … Leptoidy – komórki przystosowane do przewodzenia związków organicznych w rdzeniu gametoforów mchów, np. z podklasy płonniki (Polytrichidae). Otaczają centralnie położone hydroidy i tworzą wraz z nimi prostą wiązkę przewodzącą. Komórki te są żywe, zawierają dużo białek i cukrów. Ich końce są zwężone i skośne, a na styku z innymi komórkami znaleźć można liczne otworki z plazmodesmami tworzące rodzaj sita. Leptoidy pełnią rolę podobną do floemu (łyka) u roślin naczyniowych.ną do floemu (łyka) u roślin naczyniowych.
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| rdfs:comment |
Um leptóide é um tipo de célula condutora … Um leptóide é um tipo de célula condutora que existe nos caulídios de alguns musgos, tal como na família Polytrichaceae. Rodeiam fileiras de hidróides condutores de água. Possuem semelhanças estruturais e desenvolvimentais com os elementos de tubo de plantas vasculares sem sementes. Quando maturas possuem paredes celulares no ápice inclinadas, com pequenos poros e núcleos degenerados. As células condutores dos musgos, os leptóides e hidróides, parecem semelhantes às dos protraqueófitos. No entanto, parecem não ser um estágio intermédio na evolução dos tecidos vasculares das plantas, mas sim uma origem evolutiva independente.mas sim uma origem evolutiva independente.
, Leptoidy – komórki przystosowane do przewo … Leptoidy – komórki przystosowane do przewodzenia związków organicznych w rdzeniu gametoforów mchów, np. z podklasy płonniki (Polytrichidae). Otaczają centralnie położone hydroidy i tworzą wraz z nimi prostą wiązkę przewodzącą. Komórki te są żywe, zawierają dużo białek i cukrów. Ich końce są zwężone i skośne, a na styku z innymi komórkami znaleźć można liczne otworki z plazmodesmami tworzące rodzaj sita. Leptoidy pełnią rolę podobną do floemu (łyka) u roślin naczyniowych.ną do floemu (łyka) u roślin naczyniowych.
, A leptoid is a type of elongated food-cond … A leptoid is a type of elongated food-conducting cell like phloem in the stems of some mosses, such as the family Polytrichaceae. They surround strands of water-conducting hydroids. They have some structural and developmental similarities to the sieve elements of seedless vascular plants. At maturity they have inclined end cell walls with small pores and degenerate nuclei. The conduction cells of mosses, leptoids and hydroids, appear similar to those of fossil protracheophytes. However they're not thought to represent an intermediate stage in the evolution of plant vascular tissues but to have had an independent evolutionary origin.ve had an independent evolutionary origin.
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| rdfs:label |
Leptóide
, Leptoid
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