The genetic differences, agronomic characters and fertility recovering of hybrids F3 and 11 lines of F4 were studied through morphology, cytology and isozyme electrophoresis. The main results were as follows:
(1) The growing days of hybrids F3 were 217 days, growth rate was faster relatively. The growing days of line 1 to 7 and line 9 to 10 of F4 were 174 days, line 8 and 11 were 176 days the growth rate of line 1, 2, 8 and 9 were faster relatively, line 3 was slower and the rest of 6...