Abstract
In Cattleya aurantiaca seedlings, ethephon (2-chloroethylphosphonic acid, also known as Ethrel), slightly accelerated leaf development at concentrations between 2.5 and 20 ppm but suppressed it at 50 ppm. It inhibited leaf length at concentrations of 2.5, 5, and 50 ppm but enhanced it at 10 and 20 ppm. Root formation was inhibited by concentrations higher than 2.5 ppm. Chlorophyll content of seedlings was highest on a medium containing 5 ppm ethephon.
Highlights
Knowledge regarding the contribution of mycorrhizae to germinating orchid seeds and developing seedlings has increased in recent years, but uncertainties still exist, especially with regard to the functions of plant hormones
Ethylene promotes germination of rape, Brassica nap1ts (TAKAYA!\ACI and HARRIKCTOK 1971), but this by itself is not enough to suggest that it may have a similar effect on orchid seeds and seedlings because they differ from those of other flowering plants
A gas which diffuses is difficult to incorporate in culture media
Summary
In Callleya attrantiaca seedlings, ethephon _(2-chloroethylphosphonic acid, known as Ethrel), slightly :icc~l~rated leaf development at c~ncentratlons between 2.5 and 20 ppm but suppressed it at 50 ppm. At concentrations .of 2.5\ 5, and SO ppm but enh:inced it at 10 and 20 ppm. Root formation was mh1b1ted by concentrations higher than 2.5 ppm. Chlorophyll content of seedlings was highest on a medium containing S ppm ethephon
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
