酢浆草种子弹力传播机制初探.pdfVIP

Botanical Research 植物学研究, 2014, 3, 200-206 Published Online September 2014 in Hans. /journal/br /10.12677/br.2014.35026 The Seeds Elastic Transmission Mechanism in Oxalis corniculata L. Zisheng Zhang, Huihui Wen, Shilin Zhang, Jitai Zhang, Ying Fan, Minglin Chen* College of Life Sciences, Anhui Normal University, Wuhu * Email: jesschen28@126.com th th th Received: Jul. 18 , 2014; revised: Aug. 16 , 2014; accepted: Aug. 28 , 2014 Copyright © 2014 by authors and Hans Publishers Inc. This work is licensed under the Creative Commons Attribution International License (CC BY). /licenses/by/4.0/ Abstract The fruits of Oxalis corniculata L. were made into tissue sections respectively in their tender and mature period with paraffin method and they were observed to make the features in different physiological period. Besides, the ejecting distance was also measured. The results are as follows: The dorsal suture has been dehisced in ripening stage, so it scarcely contributes to seed transmis- sion by ejecting. Yet, aril is made up with bulliform cell, due to bulliform cell lost water severely in ripe period, tension is produced and accumulated gradually because of intercellular contracting balance. Also, the tip of seed would dehisce and turn up and the seeds would be tossed out by re- bounding when the tension beyond its critical point. Overall, aril is critical structure in seed transmission by rebounding. As chart shows ejecting distance is in direct proportion to fresh seed quality and the relationship is more obvious when dry seed is used. In addition, the density of seeds first increased and then decreased with increase of sp