Vergara - 1976 - Physiological and morphological adaptability of ri

TEMPERAJLTRE any \~'EGET;-\TI\-’E onowm 165
Tit-re (days)
IOO
40-
PLOWME
- 2cm
6.. G_
I |
2O 25 3O
Temperature (“Cl
3. Effect of temperature on time required for 2- or 3-em
plunlule elongation afier germination o1‘ rice seeds (Saito.
1965)
This stimulation of mesocotyjl elongation in thejaponiea type is mainly caused
by cell tnultiplication (Inouve, Hibi, and Ito, 1970). Concerning the cultural
temperature of seedlings after the treatment. mesocotyl length increased xvith
rising temperature from 16° to 34°C (Inouye et al.. 1971). Coleoptile elongation
was stimulated slightly by the same treatment at temperatures from 18° to 30°C;
it was strikingly inhibited at 34°C.
High temperature treatment 01' seeds before sowing promoted the emergence
of nee seedlings, especially when the seeds were deeply SOWII or covered with
compacted soil (lnotiye. 1972: lnouyte and llihi, 1972). 11owe\-'er, this effect was
not due to the high temperature treatment per se, but primarily to the seed im-