Arid
DOI10.1093/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
ISSN0305-7364
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
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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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