- published: 22 Aug 2015
- views: 5117
Aerial roots are roots above the ground. They are almost always adventitious. They are found in diverse plant species, including epiphytes such as orchids, tropical coastal swamp trees such as mangroves, the resourceful banyan trees, the warm-temperate rainforest rātā (Metrosideros robusta) and pōhutukawa (M. excelsa) trees of New Zealand and vines like Common Ivy (Hedera helix) and poison ivy (Toxicodendron radicans).
This plant organ that is found in so many diverse plant families has different specializations that suit the plant habitat. In general growth form, they can be technically classed as negatively gravitropic (grows up and away from the ground) or positively gravitropic (grows down toward the ground).
Non-parasitic ivy are vines that use their aerial roots to cling to host plants, rocks, or houses. Prop roots form on aerial stems and grow down into the soil to brace the plant, e.g. maize and screw pines (Pandanus species).
The Banyan tree (Ficus sp.) is an example of a strangler fig that begins life as an epiphyte in the crown of another tree. Its roots grow down and around the stem of the host, their growth accelerating once the ground has been reached. Over time, the roots coalesce to form a pseudotrunk, which may give the appearance that it is strangling the host. Another strangler that begins life as an epiphyte is the Moreton Bay Fig (Ficus macrophylla) of tropical and subtropical eastern Australia, which has powerfully descending aerial roots. In the subtropical to warm-temperate rainforests of northern New Zealand, Metrosideros robusta, the rātā tree, sends down aerial roots down several sides of the trunk of the host. From these descending roots, horizontal roots grow out to girdle the trunk and fuse with the descending roots. In some cases the "strangler" outlives the host tree dies, leaving as its only trace a hollow core in the massive pseudotrunk of the rātā.
A veces decimos verdades sin considerar los males
y viajamos por el mundo vestidos de vagabundos
y aunque nos une la risa también sabemos llorar
en silencio por el recuerdo de los amigos que ya no están
.
Si no volvemos a casa se acumula el equipaje
de canciones y recuerdos de los amores fugaces
tenemos buena cintura aunque estemos en la lona
la suerte que es caprichosa hay veces que te traiciona.
Qué voy a hacer si soy así!
Y aunque a veces me contradiga esta es la vida que yo elegí.
Qué podemos hacer? Nosotros somos así!
Cuando nos abandonan la vida parece un tango
entonces buscamos consuelo en el oro o en el fango
conocemos las alturas pero tambiénn el abismo,
es el precio que se paga por poder ser uno mismo.
Y seguimos tambaleando viviendo de contrabando
el ángel que nos protege se le pasa trabajando
qué puede pasar mañana, de verdad no nos preocupa
llevamos nuestro destino escrito en la hoja de ruta.
Qué voy a hacer, si soy así!
Y aunque a veces me contradiga esta es la vida que yo elegí.
Qué podemos hacer? Nosotros somos así!
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