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Ah-Chiou Lee, Fang-Shin Liao and Hsiao-Feng Lo

Lettuce ( Lactuca sativa L.) is a major freshly consumed vegetable and commonly used in salads worldwide ( Mou, 2008 ). In Taiwan, lettuce is one of the most important leafy green vegetables and is primarily consumed cooked. The production of

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

In 2008, ionizing irradiation was approved by the U.S. FDA for use on fresh Iceberg lettuce and spinach at doses not exceeding 4 kGy to enhance microbial safety and to extend shelf life ( FDA, 2008 ). Both whole head lettuce and fresh-cut lettuce

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Giedrė Samuolienė, Akvilė Urbonavičiūtė, Pavelas Duchovskis, Zenonas Bliznikas, Pranciškus Vitta and Artūras Žukauskas

, is converted to toxic nitrites and N -nitrosocompounds through mammalian and bacterial metabolism. Large amounts of nitrate may be present in leaves and petioles of many leafy vegetables such as lettuce ( Lactuca sativa L.), spinach ( Spinacia

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Alejandro R. Puerta, Suguru Sato, Yutaka Shinohara and Toru Maruo

). Therefore, the solution has to be eventually renewed. However, the disposal of diluted solutions is not likely to damage the environments. Lettuce plants grown in low-nutrient concentration accumulate lower amounts of ions, especially nitrates in leaves

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Ivan Simko and Jinguo Hu

The most common method for mapping genes in lettuce and other cultivated plant species is genetic linkage mapping. This approach involves generating populations derived from single crosses and estimating recombination frequencies between marker

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Qingquan Chu, Jiangang Liu, Khaled Bali, Kelly R. Thorp, Richard Smith and Guangyao (Sam) Wang

growers to search for mechanical means to replace manual management practices ( Taylor et al., 2012 ). According to vegetable producers in Imperial Valley, CA, the time per person to thin 1 acre and hand thinning quality in lettuce have been declining in

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Andrés R. Schwember and Kent J. Bradford

Regional Research Project W-168. We thank Incotec for assistance with the temperature gradient experiments and Seminis Vegetable Seeds for providing the lettuce seeds. Frederick J. Sundstrom and Carlos F. Quiros provided constructive comments on the

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Rebecca Grube and Edward Ryder

. Kohn, K. Subbarao, G. Abawi, M. Melzer, and R. Aburomia for critical review of tis manuscript. We acknowledge the California Lettuce Research Board for financial support of this work.

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Xenia Y. Wolff and Robert R. Coltman

`Salinas' lettuce seeds used in these studies.

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Paolo Benincasa, Marcello Guiducci and Francesco Tei

affect it. Case studies on three vegetable crops in central Italy The effect of N rate, species, and cultivar on the N uptake of sweet pepper, tomato, and lettuce has been investigated by Tei et al. (1999) . The authors found that, in all species