la muerte celular programada en las plantas - SciELO

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PROGRAMMED CELL DEATh IN PLANTS: IT IS SIMILAR TO “APOPTOSIS” IN ANIMALS?
Yornayser Pérez Delgado, Iván Galindo Castro and Francisco Arvelo
SUMMARY
Programmed cell death (PCD) is essential to maintain tissue
homeostasis in many forms of life. As in animals, in plants PCD
is the mechanism whereby a series of physiological processes,
such as germination, differentiation, growth, reproduction and
seed development, are regulated. PCD plays a key role in other
processes such as resistance to unfavorable environmental conditions.
Unlike animal models, PCD in plants has been scarcely
described at molecular level, which has given rise to controversy
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about the parallelism between this type of PCD and the process
known as apoptosis in animals. Nevertheless, evidences have
come forth lately that allow to conclude that apoptosis occurs in
plants as well. In this review, recent findings in this area in the
plant kingdom are analyzed, which throw light on the modulation
of the plant response against a diverse biotic and abiotic
stress agent, paving the way for their use in genetic improvement
programs for strategic crops.
A MORTE CELULAR PROGRAMADA NAS PLANTAS: é SEMELhANTE A “APOPTOSE” EM ANIMAIS?
Yornayser Pérez Delgado, Iván Galindo Castro e Francisco Arvelo
RESUMO
A morte celular programada (MCP) é essencial para manter
a homeostase tissular em muitas formas de vida. Nas plantas,
de igual forma que nos animais, a MCP é o mecanismo pelo
qual se regulam uma série de processos fisiológicos tais como a
germinação, diferenciação, crescimento, reprodução e desenvolvimento
de sementes. A MCP também tem um papel importante
em outros processos como o de resistência a condições ambientais
desfavoráveis. Diferentemente dos modelos animais, a MCP
em plantas é pouco descrita no nível molecular, o que há gerado
debates sobre o paralelismo entre este tipo de morte programada
e o processo conhecido em animais como apoptose. No entanto,
nos últimos anos tem surgido evidências importantes que permitem
concluir que nas plantas existe tal processo. Nesta revisão
se analisam descobertas recentes no reino vegetal para esta
área, que começam a vislumbrar elementos chave sobre a modulação
da resposta da planta diante de muitos diversos fatores de
estresse, tanto biótico como abióticos e abrindo, além disso, a
possibilidade de utilizá-los em programas de melhoramento genético
de itens agrícolas estratégicos.
DEC 2007, VOL. 32 Nº 12 819