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#1
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Vibrocentric Ivy ?
I have ivy that climbs up the wall, over the kitchen window sill, and up the
glass until I cut it back. All fronds grow vertically ove rthe glass except those within a foot or so of being under an extractor fan mounted in the glass and used daily. Those fronds grow unerringly directly, diagonally, towards the extractor. What evolutionary reason is there for ivy to grow towards a source of vibration ? Its the same every year, not some random quirk. |
#2
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Vibrocentric Ivy ?
Shoot tips of ivy and some other vines are negatively phototropic,
meaning the shoot tips grow away from the light source or toward darker areas. That allows the vine to climb solid objects. Most shoots are positively phototropic so they would grow away from solid object rather than climb them. I once saw an ivy grow into a dark basement through a crack in the foundation. There was a window in the basement, but the shoot continued to grow away from the window to the darker area of the basement. It may be that the opening in the fan simply allows the vine to grow away from the light source due to its negative phototropism. David R. Hershey n cook wrote: I have ivy that climbs up the wall, over the kitchen window sill, and up the glass until I cut it back. All fronds grow vertically ove rthe glass except those within a foot or so of being under an extractor fan mounted in the glass and used daily. Those fronds grow unerringly directly, diagonally, towards the extractor. What evolutionary reason is there for ivy to grow towards a source of vibration ? Its the same every year, not some random quirk. |
#3
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Vibrocentric Ivy ?
wrote in message
oups.com... Shoot tips of ivy and some other vines are negatively phototropic, meaning the shoot tips grow away from the light source or toward darker areas. That allows the vine to climb solid objects. Most shoots are positively phototropic so they would grow away from solid object rather than climb them. I once saw an ivy grow into a dark basement through a crack in the foundation. There was a window in the basement, but the shoot continued to grow away from the window to the darker area of the basement. It may be that the opening in the fan simply allows the vine to grow away from the light source due to its negative phototropism. David R. Hershey n cook wrote: I have ivy that climbs up the wall, over the kitchen window sill, and up the glass until I cut it back. All fronds grow vertically ove rthe glass except those within a foot or so of being under an extractor fan mounted in the glass and used daily. Those fronds grow unerringly directly, diagonally, towards the extractor. What evolutionary reason is there for ivy to grow towards a source of vibration ? Its the same every year, not some random quirk. The fan is only on 1/4 to 1/2 an hour each day and the hinged cover is up , marginally reducing the light below ,only when the fan is on , the rest of the time the cover is almost flush with the window glass. |
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