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Three pure lines of lettuce differing in their seed germinationbehaviour were crossed, and the germination of their F2 andF3 progeny was studied. The pattern of segregation of the progenywith respect to seed germination indicates that factors controllinggermination could be transmitted in a normal mendelian manner,and that the difference between these lines in their germinationbehaviour could not be caused by the seed and fruit coats. 相似文献
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The effects of red light, far-red light, Gibberellin A3, andethephon were studied on the germination of lettuce seeds cv.Grand Rapids harvested at different stages of development. Seeds did not become capable of germination until 8 days afteranthesis. Red light promoted seed germination from the age of89 days following anthesis up to the newly mature stage.Ten or 11 days following anthesis, a large percentage of seedsbecame capable of germination in the dark and therefore couldbe considered not dormant. They were affected by far-red light,but less so than the mature seeds. The effect of light on the germination of developing seeds appearedto be similar to the known light effect on mature lettuce seedgermination. Gibberellin A3 and ethephon had no effect on immatureand fresh seed germination. Lactuca sativa L., Lettuce, germination, dormancy, red light, far-red light, gibberellin A3, ethephon 相似文献
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Two lines of Grand Rapids lettuce were isolated by self-pollinationof single plants. Seeds of one line, designated A,germinate in the dark at 25 °C. Seeds of the second line,designated B germinate in a manner typical oftheir variety. The lines differ in sensitivity to red (R) andfar-red (FR) light, in the ability of their seeds to overcomeresistance of an external osmotically active medium, in theresponse of mature seeds to abscisic acid, and in the responseof young seeds to gibberellin and benzyl adenine. Aseeds germinate faster than B seeds in the darkor after R or FR irradiation. 相似文献
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