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D.L. Lange

138 ORAL SESSION 37 (Abstr. 639–644) Temperature Stress–Vegetables

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Sacha J. Johnson and Carol A. Miles

High-value vegetable crops such as eggplant, tomato, and watermelon are grafted to increase vigor, yield, tolerance to salinity and temperature extremes, and disease resistance ( Lee, 1994 , 2003, 2007; Paroussi et al., 2007 ; Rivard and Louws

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Robert D. Berghage and Royal D. Heins

Abbreviations: ADT, average daily temperature; DIF, DT - NT; DIBE, days from pinching to day internode started to elongate; DT, day temperature; N, total number of internodes below inflorescence; NT, night temperature; VB, date of first visible bud

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B.Z. Escalante and Alan R. Langille

`Katahdin' potato plants were grown under conditions that did not induce tuberization (noninducing conditions) and the foliage was sprayed with either a growth retardant (BAS-111) at 1000 mg·L-1 or distilled water. Other plants, grown under tuber-inducing conditions, received a foliar spray of gibberellic acid (GA3) at 100 mg·L-1 or distilled water. After 1 week, treatments were repeated. Two-node stem segments were excised from the apical, subapical, medial, and basal sections of each plant 72 hours after the second foliar treatment, disinfested, and inserted into flasks containing 50 mL of Murashige and Skoog medium (2% sucrose). After 3 weeks in a darkened incubator adjusted to 24 °C, tuberization response was evaluated. Orthogonal contrasts revealed significant differences between induced and noninduced controls for tuber number, diameter, and fresh mass. BAS-111 reduced rhizome length and increased tuber number, diameter, and fresh mass. GA3 increased rhizome length, but reduced tuber number, diameter, and fresh mass. Node location influenced tuber development, as basal explants produced significantly more and larger tubers, as well as longer rhizomes, than did apical explants, and subapical segments produced more and larger tubers than did apical segments. There were no significant differences between medial and basal nodal segments with respect to tuber number or tuber/rhizome size. Chemical names used: 1-phenoxy-5,5-dimethyl-3-(1,2,4-triazol-1-yl)-hexan-5-ol (BAS-111); 2,4a,7-trihydroxy-1-methyl-8-methylenegibb-3-ene-1,10-carboxylic acid 1->4 lactone (GA3).

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Paul E. Cappiello

89 POSTER SESSION 13 Temperature Stress/Cross-Commodity

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Orville M. Lindstrom, Tomasz Anisko, and Michael A. Dirr

89 POSTER SESSION 13 Temperature Stress/Cross-Commodity

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John F. Wachter and Paul E. Cappiello

78 ORAL SESSION 13 (Abstr. 084–091) Stress–Cold Temperatures

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Martin P.N. Gent

was 24% higher in winter. This result suggests oxalate will be high when nitrate is high. There is little effect on yield or quality of hydroponic spinach produced at root-zone temperatures of 20, 24, or 28 °C in summer or 15, 20, or 25 °C in winter

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Sean M. Campbell, Brian J. Pearson, and S. Christopher Marble

temperatures required to manufacture rockwool render it biologically inert and, therefore, free from potential weeds, pests, and diseases that might normally hinder germination. This manufacturing process also renders a very consistent substrate that possesses

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John E. Erwin, Royal D. Heins, and Roar Moe

Abbreviations: ADT, average daily temperature; DIF, difference; DT/NT, day/night temperature; FR, far red; LD, long day; NI, night interruption; R, red; SD, short day. 1 Current address: Dept. of Horticultural Science, Univ. of Minnesota, 1970