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Wenjing Guan and Xin Zhao

countries ( Davis et al., 2008 ). Using this method, rootstock and scion plants are cut halfway through at hypocotyl, respectively; and then they are joined together by aligning the cut surfaces. The rootstock top and the scion root are removed several days

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L. Eric Hinesley, Frank A. Blazich, and Layne K. Snelling

Hardwood and softwood stem cuttings of 5-year-old Atlantic white cedar [Chamaecyparis thyoides (L.) B.S.P.] were cut to 12-cm (short) or 24-cm (long) lengths, treated with 0 to 15 g IBA/liter in 50% isopropyl alcohol, and rooted in a raised greenhouse bench under intermittent mist. When hardwood cuttings were collected in February, short cuttings survived and rooted better than long cuttings. Survival and percent rooting for softwood cuttings collected in late August was virtually 10070 regardless of cutting length. Long cuttings produced more roots and longer roots with hardwood and softwood material. IBA was unnecessary for rooting, but it markedly increased the number of roots. Chemical name used: 1H-indole-3-butyric acid (IBA).

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Nicholas A. George, Kenneth V. Pecota, Blake D. Bowen, Jonathan R. Schultheis, and G. Craig Yencho

labor requirements. Root piece planting in sweetpotato has been investigated since the 1940s but is not reported to be used commercially anywhere in the world. In this work, we review and synthesize the research literature relating to root piece planting

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S.L. Krebs

Root rot caused by the soil-borne pathogen Phytophthora cinnamomi is one of the deadliest and most costly diseases in rhododendron culture. Unfortunately, the majority of cultivars appear to be susceptible to this fungus. Host resistance does occur, but it represents a tolerance of rather than immunity from the disease. A breeding program has been initiated to develop a broader array of root rot resistant cultivars and to determine the genetic basis for resistance. Greenhouse inoculations and screenings of 48 contemporary cultivars yielded seven clones with moderate to high levels of resistance to P. cinnamomi. Protocols for evaluation at the seedling stage were developed in order to screen large breeding populations of about 200 seedlings per cross. Root rot tolerance appears to have low-moderate heritability in these rhododendron populations. Groups of progeny with one resistant parent had a slower mortality rate and higher survivorship (avg. 10%) after 2 months of disease pressure than crosses in which both parents were susceptible (0 survivorship). A recurrent selection strategy is planned to increase the frequency of alleles for resistance in breeding populations of rhododendrons.

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Wei-Ling Guo, Yao-Chien Alex Chang, and Chien-Yuan Kao

). However, a number of problems have restricted the choice of explants, including phenolic exudation, limited numbers of meristems, the difficulty to induce PLBs, and somaclonal variation ( Chugh et al., 2009 ; Sánchez, 1988 ). Although root tips of orchids

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Jingjing Yin, Nina L. Bassuk, Madeline W. Olberg, and Taryn L. Bauerle

Survivorship of high-quality landscape field-grown trees is a particular challenge as a result of differences in post-transplant recovery between species. During bare-root tree transplanting, a major part of the root system is severed, the tree is

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Arthur Villordon and Christopher Clark

( Lawrence et al., 1986 ; Overstreet, 2013 ). Cracks induced by the nematodes can also provide an opportunity for decay organisms to enter the root and cause secondary storage rots. Current management options for Meloidogyne spp. in sweetpotatoes include

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T.R. Konsler, S.W. Zito, J.E. Shelton, and E.J. Staba

Abbreviations: RN, root tissue nutrients; SF; soil fertility; Tg, spectrophotometric measure of total ginsenosides. 1 Professor Emeritus. 2 Associate Professor. 3 Professor. Paper no. 12054 of the Journal Series of North Carolina Agricultural

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Doina Clapa, Alexandru Fira, and Nirmal Joshee

, plantlets rooted in vitro on media favorable for rooting are used ( Bobrowski et al., 1996 ; Erig and Schuch, 2005 ; Fira et al., 2009 ; Najaf-Abadi and Hamidoghli, 2009 ; Radmann et al., 2003 ; Ružic and Laziž, 2006 , 2007 ). Hazarika (2003) , in a

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Mara Grossman, John Freeborn, Holly Scoggins, and Joyce Latimer

plant production cycle. Some commercial producers of liners have reported reduced root mass in plants treated with BA (personal communication). BA has been shown to reduce root growth in in vitro Arabidopsis seedlings ( Auer, 1996 ). Sedum leaf