%0 Journal Article
%A Po-Huei Chen and Warren H. J. Kuo
%T Germination Conditions for the Non-dormant Seeds of Monochoria vaginalis
%D 1995
%J Taiwania
%V 40
%N 4
%P 419-432
%U https://taiwania.ntu.edu.tw/abstract/899
%X Effects of environmental factors on the germination of non-dormant seeds of Monochoria vaginalis (Burm. f.) Persil var. plantaginea Solms. were investigated. Under anoxia condition the seeds germinated but the subsequent seedling growth was retarded. In hypoxia condition of 6 mm submergence, the seeds germinated readily and the seedlings grew normally. Aerobic condition inhibited germination almost completely. The seeds absolutely required light to germinate. Light intensity saturated at as low as 5 × 10-3 mol/m2/day. No inhibition ongermination was found at light intensity of 3 mol/m2/day. Under waterlogged condition the seeds were prevented from germination by burying in the soil up to 4 mm depth. Percentage germination was inhibited slightly and progressively in deeper depth of soil up to 16 mm, drastically decreased thereafter. Almost no germination occurred at 20 mm depth. No effect of water potential within -0.2 MPa on germination was found. Percentage germination was decreased slightly and progressively between -0.2 to -0.8 MPa, drastically decreased thereafter. The non-dormant seeds germinated well at constant temperature ranging from 22-32 ℃. Minimum and maximum temperature for germination were approximately 14 and 40 ℃, respectively. Base, optimum and ceiling temperatures of the rate of germination were 12.7, 30.4 and 65.8 ℃ respectively. Thermal time for 50 % germination was 19.2 and 38.5 degree-day for sub-optimum and supra-optimum temperature respectively. Suitable methods and conditions for germination tests were proposed.
%M doi:10.6165/tai.1995.40.419