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Lawrence W. Zettler, Sarah B. Poulter, Kris I. McDonald and Scott L. Stewart

of fungi to orchids in situ, the preservation of seeds alone has raised conservation concerns ( Johansen and Rasmussen, 1992 ; Zettler et al., 2003 ). Compared with their terrestrial counterparts, few epiphytic orchid taxa have been cultivated in

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M.L. Marin and N. Duran-Vila

We thank J. Juarez and J.M. Arregui for their availability and assistance, and L. Navarro for his suggestions and comments. on genetic conservation of citrus. The research was supported by INIA, IBPGR, and a fellowship to the senior author provided

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Lewis W. Jett and Timothy P. Talbot

A cultural practice that can modify and conserve the soil environment is needed in sweetpotato [Ipomoea batatas (L.) Lam.] production. The objective of this research was to evaluate conventional and conservation tillage of sweetpotato with four cover crop species (fallow, ryegrass, rye, and wheat). The cover crops were seeded in late Oct. 1995, and the sweetpotato transplants (`Beauregard') were transplanted at two dates the following spring (May and June). Conservation tillage significantly lowered soil temperature (10 cm depth) during storage root initiation and development. Moreover, each cover crop significantly reduced weed emergence and soil erosion. The ryegrass conservation tillage treatment significantly increased marketable yield of sweetpotato in the first planting date, while rye and wheat performed equally well in the second planting date. In the second planting date, white grub (Phyllophaga ephilida Say) injury to storage roots was significantly higher in the conservation tillage treatments. However, conservation tillage seems to be a viable alternative to the conventional method of sweetpotato production.

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Andrea N. Brennan, Valerie C. Pence, Matthew D. Taylor, Brian W. Trader and Murphy Westwood

for Conservation of Nature’s Red List of Oaks ( Oldfield and Eastwood, 2007 ), roughly 45% were categorized as critically endangered, endangered, vulnerable, or near threatened. Conservation of this genus is challenging because oak acorns do not

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Baldev Lamba and Grace Chapman

and I remember – I do and I understand,” attributed to Confucius, underscores the importance of experiential learning. Our exhibit received awards from many prestigious organizations, testifying to our mission of conservation, environmental

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Chandra S. Thammina, Christopher von Kohn and Margaret R. Pooler

faced with threats from logging, agricultural land use, development, and collection, and are at risk of extinction. According to a recent study by Botanic Gardens Conservation International (BGCI), 48% of the species studied are threatened in the wild

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María del C. Montalvo-Peniche, Lourdes G. Iglesias-Andreu, Javier O. Mijangos-Cortés, Sara L. Nahuat-Dzib, Felipe Barahona-Pérez, Adriana Canto-Flick and Nancy Santana-Buzzy

alternative to genetic variability conservation, crop improvement programs, and production of certified seeds, especially for recalcitrant species. The minimal growth plant method is a common midterm in vitro conservation system and involves the reduction of

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Fanjuan Meng, Mu Peng and Fachun Guan

two or more molecular marker systems is most likely efficient for the conservation and management of peach germplasms. Furthermore, the effects of factors on morphological traits and fruit development should be taken into account when elucidating the

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Carrie A. Radcliffe, James M. Affolter and Hazel Y. Wetzstein

for reintroduction and safeguarding purposes. Ex situ propagation efforts often play an integral role in plant conservation ( Guerrant et al., 2004 ; Maunder and Culham, 1999 ). Tissue culture has been used to propagate rare species ( Fay, 1992 ; Fay

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Martín Mata-Rosas, Rosario Julieta Baltazar-García and Victor Manuel Chávez-Avila

). Discussion With in vitro propagation studies, especially when conservation of endangered species is involved, seeds are the most commonly used and recommended explants because they have great regenerative capacity and are the main source of genetic diversity