|CATT tegen tulpengalmijt
Vreeburg, Peter - \ 2015
tulip - mite - tulp - mijt
|A cold treatment promotes both sprouting and sink strength of lily bulblets
Klerk, G.J.M. de - \ 2009
Propagation of ornamental plants 9 (2009)2. - ISSN 1311-9109 - p. 102 - 106.
regenerated in-vitro - low-temperature - dormancy development - abscisic-acid - invitro - pathways - growth - potato - tulip - induction
Lily bulblets produced in tissue culture at 20 or 25ºC are cold-treated before planting to break dormancy. Bulblets produced in tissue culture at a relatively low temperature (15ºC), though, are nondormant and sprout without a preceding cold treatment. Leaves generated after planting by noncold-treated 15ºC bulblets, were relatively small and as a consequence bulblet growth after planting was limited. This was also observed for the few 20 and 25ºC bulblets that did sprout without a cold treatment. Sink-strength of bulblets was assessed as bulblet dry-weight (DW) gain per mg leaf DW. Noncold-treated bulblets had far less sink-strength than cold-treated ones. Thus, a second cause of the little growth of noncold-treated bulblets was their small sink-strength. The optimal temperatures to break dormancy and to promote sink strength were 9 and 2ºC, respectively. It is concluded that a cold treatment not only breaks dormancy but also enhances sink strength, and that these are unrelated processes.