GRAVITROPIC RESPONSE IN EICHHORNIA CRESSIPES (WATER HYACINTH) .1. PROCESS OF GRAVITROPIC BENDING IN THE PEDUNCLE
GRAVITROPIC RESPONSE IN EICHHORNIA CRESSIPES (WATER HYACINTH) .1. PROCESS OF GRAVITROPIC BENDING IN THE PEDUNCLE
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DOI：
10.1007/bf02344364
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发表时间：
1995-09-01
影响因子：
2.8
通讯作者：
MASUDA, Y
中科院分区：
文献类型：
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作者：
KOHJI, J;YAMAMOTO, R;MASUDA, Y
在凤眼莲花色周期的后半部分，花梗表现为两步弯曲反应，开始于开花结束后：第一次弯曲发生在花梗上部，第二次弯曲发生在花梗底部。在本研究中，只考察了初级弯曲反应，得到了以下结果：(1)在日本西部的条件下，花动周期在36-40小时内完成。花序在夜间开始生长，次日早晨达到盛花期，晚上开始弯曲，次日早上完成弯曲。(2)弯曲是正向重力性的，因为当花梗放置在以2-3rpm旋转的水平回转器上或倒置时，花梗不会弯曲。(3)在花期结束之前，花梗表现出正常的负重力反应，但之后它表现出正重力反应。(4)弯曲是由于花梗凸面的伸展和凹面的收缩所致。上侧伸展是由细胞伸展引起的。在由负向正向重力反应的转折点，柄的伸展停止了几个小时。从以上结果可以得出结论：水葫芦茎的初级弯曲反应为正向力性反应。
In the last half of the anthokinetic cycle in Eichhornia cressipes the peduncle showed a two-step bending response which started after the completion of the flowering: the primary bending in the upper region and the second one in the base of the peduncle. In the present study, only the primary bending response was examined and the following results were obtained.(1) Under the condition in the Western Japan, the anthokinetic cycle completed in 36-40 hr. The inflorescence started to grow during night, reaching the full flowering stage next morning, and the bending was initiated in the evening and completed next morning.(2) The bending was a positive gravitropism since the peduncle did not show bending when it was placed on a horizontal clinostat rotating at 2-3 rpm, or when the plant was placed up-side-down.(3) Before the end of flowering phase, the peduncle showed a normal negative gravitropic response but afterward it acquired the property to show a positive gravitropic response.(4) The bending was due to the extension of convex side of the peduncle, accompanied by a shrinkage of the concave side. The extension of the upper side was caused by cell extension. At the turning point from negative to positive gravitropic response, the extension of the peduncle ceased for several hours.From the above results it is concluded that the primary bending response of the peduncle in water hyacinth was a positive gravitropism.