Outcrossing of Rice Plant under Generation Accelerating Conditions in Greenhouse

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In progeny lines selected from bulk hybrid populations which had been grown the genera-tion accelerating conditions in greenhouse, the degree of fixation for some agronomic chara-cters was often lower than that expected from the degree of generation advance. In order to clarify the causes of this phenomenon the amount of outcrossing was inves-tigated by observing xenia grains on glutinous rice varieties grown in mixtures which non-glutinous varieties under different planting patterns in a greenhouse in 1974 and 1978 (Table 1). The percentage of xenia grains varied between O and 92. 9 per 'cent, depending on crop-ping season and planting density (Table 3 and 4). High percentage of xenia grains was observed under high planting density. This may presumably a result of pollen abnormity under unusual conditions such as low temperature or close spacing in the greenhouse. As expected, the xenia grains increesed when a glutinous variety was interplanted in close proximity to a non-glutinous variety and percentage of ripened grains of the glutinous variety was low (Table 4, Fig. 1). These results were consistent with the reports that the amount of outcrossing was promoted by the cool weather and close distance in the field. It can be presumed that of genetic segregation of several agronomic characters observed after rapid generation advance was patially caused by outcrossing between plants in the gteenhouse.
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