|
|
Post by caseyhoo on Jan 17, 2008 22:57:16 GMT 8
As I understand, it is not seed, but is between seed and plantlet... Correct me if im wrong.
How drosera produce those gemmae? It is between wheather change to cooler?
Thanx...
|
|
|
|
Post by tarence on Jan 21, 2008 8:37:54 GMT 8
As far as I know, only the pygmy sundews produce gemmae. Yes, it`s passed the seed stage & about to be a plantlet.
|
|
|
|
Post by jonathan on Jan 21, 2008 13:15:05 GMT 8
Hi csey...
ok here is something about Pygmy sundew's and gemme production...
1) Gemmae - Specialized liverwort cells that allow the plants to reproduce asexually when broken off from the parent plant, these cells can grow independently into new pygmy sundew plants.....
2) Almost all pygmy's come from west australia
wich has 13.5 hours of light in summer and 10.5 in winter.
Gemmea production is bound to the fall season.
3) The main changes in the situation are light temperature and water.
then i think it is indeed the light cycle that triggers gemmea production.
4) I guess in malaysia if you lower the light level it recieve and without the direct sun heat it will triggers the pygmy sundew's to produce gemmea...
5) Note that they produce gemmae when about to go dormant....
Hope this help...
Cheerio
Jonathan
|
|
|
|
Post by cosmoking on Jan 22, 2008 1:38:40 GMT 8
Gemmea are asexual organs that actively produce chlorophyll and thus use photosynthesis to do this, as well as being able to respirate. Each gemmea is thus essentially living and needs oxygen and sunlight to survive; this means that gemmea cannot be buried and sown in a medium like normal seeds. Pygmy sundews are not the only plants capable of producing gemmea; another well known example are liverworts.
In their natural habitat, gemmea production usually begins in the late Autumn, and continues until around mid Winter(in the northern hemisphere, these are the months between November and January, with December generally being the peak season) In Australia however, this period is equivelant to the Summer in the northern hemisphere, due to the reversed seasons.
Production is triggered by the shortening and cooling of the days, and probably extra rainfall as well. In their natural habitat, gemmea blast off from the mother plant and can land pretty far away, increasing the area of distribution of the pygmy's significantly. However, in cultivation gemmea is usually removed by hand and sown as soon as possible; the shelf life of gemmea is short, lasting seldomly longer than 3 weeks.
|
|
