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Abbas Lafta and Beiquan Mou

Temperature is a major environmental factor that influences plant growth and development. Lettuce ( Lactuca sativa L.) is a cool-season crop with optimum growth at an average temperature of 18 °C. Production of lettuce at higher temperature ranges

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Beiquan Mou and Yong-Biao Liu

endorsement, guarantee, or warranty by the U.S. Dept. of Agriculture and does not imply its approval to the exclusion of other products or vendors that may be suitable. This research was supported in part by grants from the California Lettuce Research Board.

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Chenping Xu and Beiquan Mou

et al., 2008 ). Lettuce ( Lactuca sativa L.) is one of the most important salad vegetables in the United States, and contains important phytochemicals, including vitamins, carotenoids, and other antioxidants ( Humphries and Khachik, 2003 ; Nicolle

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Edward J. Ryder

This work was supported in part by the California Lettuce Research Board. Thanks to David J. Milligan for technical assistance.

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Roy E. McDonald, Lawrence A. Risse and Charles R. Barmore

Edith Garrett of South Bay Growers, South Bay, Fla., for supplying the lettuce and Roxanne Wiseman for technical assistance in this work. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations

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Edward J. Ryder

This work was supported in part by the California Lettuce Research Board. Thanks to David J. Milligan for technical assistance.

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Sylvie Jenni and Gaetan Bourgeois

initiation, crisphead lettuce leaves continue to grow, overlapping onto each other to form a head of increasing density and size. At harvest time, maturity is evaluated on the basis of density and size ( Garrett et al., 1969 ; Goddard et al., 1972

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Haly L. Neely, Richard T. Koenig, Carol A. Miles, Teresa C. Koenig and Meriam G. Karlsson

Leafy green vegetables are an important source of NO 3 – in the human diet ( Maynard et al., 1976 ; Santamaria et al., 1999 ; Vogtmann et al., 1984 ). Vegetables with a tendency to accumulate high concentrations of NO 3 – include lettuce

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Edward J. Ryder and Bert J. Robinson

We thank Dick Lindsey, Nunes Vegetables, for providing land for many field trials. Part of this research was supported by a grant from the California Iceberg Lettuce Research Program. The cost of publishing this paper was defrayed in part by

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C.A. Sanchez, S. Swanson and P.S. Porter

Univ. of Fla. Expt. Sta. Journal series no. 10068. We thank South Bay Growers Inc. for providing the lettuce production fields used in these studies and some of the crop care. The cost of publishing this paper was defrayed in part by the payment of