Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1093/aob/mcj011 |
Anatomical significance of the hygrochastic movement in Anastatica hierochuntica | |
Hegazy, AK; Barakat, HN; Kabiel, HF | |
通讯作者 | Hegazy, AK |
来源期刊 | ANNALS OF BOTANY
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ISSN | 0305-7364 |
出版年 | 2006 |
卷号 | 97期号:1页码:47-55 |
英文摘要 | center dot Background and Aims Unlike the dispersal mechanisms of many desert plants, the whole dead skeleton of Anastatica hierochuntica is involved in seed dispersal and preservation. This process depends on the hygrochastic nature of the lignified conducting tissue that bends when dry and straightens under wet conditions. An anatomical interpretation of this mechanical movement was investigated. center dot Methods An anatomical study of the stem was conducted on the juvenile plants raised under different water treatments and on the branch-orders of adult A. hierochuntica size-classes. center dot Key Results In the juvenile stem of A. hierochuntica, the area of cortex, conducting tissue and pith increased with water availability. However, the hydraulic conductance decreased, resulting in a better withdrawal of water in water-stressed plants. The anatomical investigation of the hygrochastic mechanism revealed an asymmetric distribution of the cortical tissues, with the conducting tissues of the stem of juvenile and adult plants being larger in the lower side. The hydraulic conductance was better in the basal and middle branch-orders than the terminal ones, permitting better conductance of water to the subsequent branch-orders. center dot Conclusions The lignified conducting tissue of the whole stem, having a hygrochastic nature, controls the movement of the branches. The greater amount of conducting tissue associated with a higher density of wide xylem vessels was observed in the lower side of the stem as compared with the upper side. Consequently, the conducting tissue in the lower side of the stem was suggested to be more effective in the opening process of the curled dry branches through better and more rapid conductance of water. Alternatively, due to the few narrow xylem vessels in the upper side of the stem, it was likely that the conducting tissue in the upper side is more effective in the closing process by providing more rapid drying. The mechanical rise of water and the related hygrochastic efficiency were maximized in the basal and middle branch-orders that are mostly involved in the mechanical movement. |
英文关键词 | anatomy hygrochasy seed dispersal hydraulic conductance Anastatica hierochuntica |
类型 | Article |
语种 | 英语 |
国家 | Egypt |
收录类别 | SCI-E |
WOS记录号 | WOS:000233989200005 |
WOS关键词 | PERSICA BURM KUNTZE ; SEED DISPERSAL ; GERMINATION ; PLANTS |
WOS类目 | Plant Sciences |
WOS研究方向 | Plant Sciences |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/150709 |
作者单位 | (1)Cairo Univ, Fac Sci, Dept Bot, Cairo 12613, Egypt |
推荐引用方式 GB/T 7714 | Hegazy, AK,Barakat, HN,Kabiel, HF. Anatomical significance of the hygrochastic movement in Anastatica hierochuntica[J],2006,97(1):47-55. |
APA | Hegazy, AK,Barakat, HN,&Kabiel, HF.(2006).Anatomical significance of the hygrochastic movement in Anastatica hierochuntica.ANNALS OF BOTANY,97(1),47-55. |
MLA | Hegazy, AK,et al."Anatomical significance of the hygrochastic movement in Anastatica hierochuntica".ANNALS OF BOTANY 97.1(2006):47-55. |
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