Arid
DOI10.1017/S0266467413000801
Reciprocal transplant experiment suggests host specificity of the mistletoe Agelanthus natalitius in South Africa
Okubamichael, Desale Y.; Griffiths, Megan E.; Ward, David
通讯作者Okubamichael, Desale Y.
来源期刊JOURNAL OF TROPICAL ECOLOGY
ISSN0266-4674
EISSN1469-7831
出版年2014
卷号30页码:153-163
英文摘要

We surveyed the community composition of trees that host the mistletoe Agelanthus natalitius (Loranthaceae) at two sites (Highover and Mtontwane) in South Africa. We recorded a total of 1464 trees (Acacia karroo and A. caffra) hosting 1202 mistletoes in the 64 surveyed plots (20 x 50 m). There were almost four times as many A. karroo as A. caffra at Highover and three times as many A. karroo as A. caffra at Mtontwane. There was no significant difference in prevalence (percentage of infected trees) at Highover (A. karroo = 22% and A. caffra = 26%), but a significantly greater percentage of A. caffra trees were parasitized at Mtontwane (A. karroo = 25% and A. caffra = 34%). Intensity of infection (number of mistletoe infections per tree) was higher for A. karroo (0.73 +/- 0.04 and 1.03 +/- 0.64) than for A. caffra (0.66 +/- 0.01 and 0.89 +/- 0.035) at Highover and Mtontwane, respectively. Prevalence and intensity of infection showed a significant positive relationship with tree size for both host species at both sites. We tested the genotype-by-environment interaction effects in this mistletoe by conducting reciprocal transplant experiments (64 individual trees each received 20 seeds). Initial germination was not site-, substrate-or host-sensitive. However, a general pattern was found that hypocotyls of the germinated seeds grew longer when seeds were placed on the same host species as the parent plant within their own source locality. Consistent with this observation, mistletoes placed on their source host species generally had higher survival than those transferred to non-source host species after 6 mo. Overall, mistletoe seeds from parent plants on A. karroo and mistletoe seeds placed on A. karroo had the highest survival. This could be the result of an adaptation of the mistletoe to the most frequently encountered host species.


英文关键词Adaptive phenotypic plasticity Acacia caffra Acacia karroo Agelanthus natalitius coevolution G x E interactions prevalence intensity host specificity reaction norms
类型Article
语种英语
国家South Africa
收录类别SCI-E
WOS记录号WOS:000337762300006
WOS关键词PLANT TRIPHYSARIA-VERSICOLOR ; DESERT MISTLETOE ; PARASITIC ANGIOSPERMS ; LYSIANA-EXOCARPI ; AMYEMA-PREISSII ; NEW-ZEALAND ; LORANTHACEAE ; DISPERSAL ; PATTERNS ; GERMINATION
WOS类目Ecology
WOS研究方向Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/183718
作者单位Univ KwaZulu Natal, Sch Life Sci, ZA-3209 Pietermaritzburg, South Africa
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GB/T 7714
Okubamichael, Desale Y.,Griffiths, Megan E.,Ward, David. Reciprocal transplant experiment suggests host specificity of the mistletoe Agelanthus natalitius in South Africa[J],2014,30:153-163.
APA Okubamichael, Desale Y.,Griffiths, Megan E.,&Ward, David.(2014).Reciprocal transplant experiment suggests host specificity of the mistletoe Agelanthus natalitius in South Africa.JOURNAL OF TROPICAL ECOLOGY,30,153-163.
MLA Okubamichael, Desale Y.,et al."Reciprocal transplant experiment suggests host specificity of the mistletoe Agelanthus natalitius in South Africa".JOURNAL OF TROPICAL ECOLOGY 30(2014):153-163.
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