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M. Damayanti, G.J. Sharma, and S.C. Kundu

The application of gamma radiation for improving the storage of pineapple fruits [Ananas comosus (L.) Merr. cv. Queen] has been studied in an attempt to reduce decay caused by fungal pathogens such as Ceratocystis paradoxa (Dade)-Moreau and Penicillium purpurogenum Stoll. Gamma radiation at 50, 75, 100, 150, and 250 Gy improved shelf life. The maximum tolerable dose was ≈250 Gy. Fruits irradiated with up to 150 Gy and then stored at 25 to 28C maintained their texture better than did the controls. Radiation, particularly at doses >250 Gy, caused browning of the shin and softening of tissues. Browning increased with increasing radiation dose and storage duration. Excessively high doses promoted spoilage. Doses in the range of 50 to 250 Gy, in combination with storage at 11 to 13C, can be used to reduce postharvest losses in pineapple due to fungal diseases and senescence, thereby extending shelf life.

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L. Eric Hinesley and Layne K. Snelling

Dormant branches of Fraser fir [Abies fraseri (Pursh) Poir.] Christmas trees were subjected to single doses of gamma radiation at levels ranging from 0 to 5.0 kGy (0 to 500 kRad). Significant needle loss resulted at doses ≥0.10 kGy and increased with radiation intensity. Irradiation discolored foliage and accelerated drying. Irradiation does not appear to be a viable way to meet insect quarantine requirements on cut Fraser fir Christmas trees.

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Kelly M. Oates, Darren H. Touchell, and Thomas G. Ranney

equipment, either a nuclear reactor or particle accelerator, both of which can produce considerable heat and can cause residual radioactivity in the plant material. Alternatively, the use of ionizing radiation (x-rays or gamma rays) does not result in any

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Shaoyun Lu, Zhongcheng Wang, Yuejing Niu, Zhenfei Guo, and Bingru Huang

, indicating they might produce a denser turf than 7-9. Previous studies using gamma radiation have developed dwarf bermudagrass cultivars ( Burton, 1985 ; Hanna and Elsner, 1999 ; Hanna et al., 1997 ) and st. augustine cultivars ( Busey, 1980 ). This study

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Killian Melsen, Mark van de Wouw, and Ryan Contreras

increase in the mutation rate by ≈15,000% over base levels ( Muller, 1927 ). At almost the same time, Stadler independently showed that X-rays and gamma radiation had similar effects on barley and maize ( Stadler, 1928a , 1928b ). The value of these

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Kristina Košmrlj, Jana Murovec, and Borut Bohanec

use of a gamma source of radiation and an increased interest in X-ray treatments is anticipated ( Food and Agriculture Organization of the United Nations/International Atomic Energy Agency, 2013 ). Also for this reason, the elaborated method might have

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Xuetong Fan, Kimberly J. Sokorai, Brendan A. Niemira, Robert S. Mills, and Mark Yueqian Zhen

dosimetry were performed using a self-contained gamma radiation source (Lockheed Georgia Company, Marietta, GA) as described earlier ( Fan and Sokorai, 2002 ; Shieh et al., 1985 ). After irradiation, lettuce pretreated with 1-MCP or N 2 flushing was stored

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Sima Taheri, Thohirah Lee Abdullah, Nur Ashikin Psyquay Abdullah, and Zaiton Ahmad

/shape, and chlorophyll mutation in leaves have been developed and released in different ornamentals. So far, gamma rays were used to develop 64% of the radiation-induced mutant varieties, whereas 22% of induced mutants were produced by X-rays ( Ahloowalia et

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Davut Keleş, Ceren Özcan, Hasan Pınar, Atilla Ata, Nihal Denli, Namık Kemal Yücel, Hatıra Taşkın, and Saadet Büyükalaca

of pollen wall have significant impacts on the success of pollination with irradiated pollen. Gamma rays obtained from Co 60 source are commonly used for pollen irradiation. When a flower is pollinated with irradiated pollen, the pollen’s vegetative

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M.R. Pooler and R. Scorza

Pollen from the doubled haploid peach [Prunus persica (L.) Batsch] `Hall-D' was irradiated with 0, 290, 530, 820, 1000, 5000, or 9000 Gray (Gy) of gamma radiation, 113 μW·cm-2 of ultraviolet (UV) radiation, or exposed to 100 °C for 2 h. In vitro pollen germination percentages were recorded and pollen was used to pollinate more than 10,000 emasculated or male-sterile peach flowers. Although pollen germination in vitro was stimulated by <1000 Gy of gamma irradiation, seed set following pollination was greatly reduced in all treatments. These results suggest that low levels of irradiation are sufficient to render pollen infertile while still maintaining germination capacity. Such results may be useful for pollination-induced parthenogenetic egg division for the production of maternally derived haploids and for the production of interspecific hybrids.