Studies on the Cold Resistance in SugarcaneⅠ. Effects of the Low Temperature on the Seedling Growth

Sandy culture experiments were carried out to study the effects of the length of low temperature treatment time (0,3,6,9 hr.) on the seedcane,bud germination and seedling quality.The main results were as fellows; 1.The cane buds were softed,water-logged and destroyed after low tempterature treatments,especially in the 9 hr.treatment.However,the root primordium appeared not to be damaged.On the other hand,acid invertase activity increased and the reducing sugar content was raised for the low temperature treatment in the seedcane.2.The menifestation of lowered seedling quality,such as dwarf ness of plant and decreased numbers of leaves,was observed with the increase length of the low temperature treatment time in the seedcane.It was revealed from the principal component analysis that a well developed root system was fundermental for the high yield because of the stronger effect of low temperature on shoot than on root.3.By means of regression simulation of nine curves,germinating potential coincided with three times curves.Bud sprout slowed and the germinaring percentage decreased with the low temperature treatment time lengthed.