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Eleazar Reyes and Paul H. Jennings

Roots of `Golden Girl' squash (Cucurbita pepo var. melopepo) and `Encore' cucumber (Cucumis sativus L.), 4- and 3-days-old, respectively, were exposed to 2, 6, 10, and 15C for 24, 48, 96, 144, and 192 hours to compare the sensitivity to chilling temperatures and the subsequent recovery at more favorable temperatures. Seedlings were more sensitive to chilling at 2 and 6C when measured by their ability to resume growth when returned to 26C. Root growth decreased after 48 hours of chilling. Seedlings stressed at 10 and 15C were able to continue root growth at these temperatures and when returned to 26C. However, seedlings at 10C exhibited root-tip browning in both crop species, suggesting disfunction in metabolic pathways that were repressed in seedlings growing at 2C where those symptoms were not present. Effects on root dry weight occurred in the first 24 hours at all temperatures studied. After 96 hours of treatment, seedlings grown at 2 and 6C were irreversibly damaged, as evidenced by their inability to resume growth when returned to 26C. Leakage of electrolytes from squash and cucumber roots increased after 48 hours at 2C. Potassium, Na+, and PO4 -2 were lost in greater amounts than Mg+2, Cl-, and SO4 -2. No difference in ionic leakage occurred at 10 and 15C, and Ca+2 leakage was not detected at any chilling stress temperature.

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Boris Andrés Bran Barrientos and Jong-Yi Fang

. Composition of culture media used for asymbiotic seed germination of Spathoglottis plicata. Seedling development. Germinated seeds that proceeded through subsequent development stages are collectively termed seedlings in this study. Seedling development was

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Wook Oh, Erik S. Runkle, and Ryan M. Warner

subsequent growth and development of petunia and pansy. Materials and Methods Daily light integral treatments during the seedling stage. Seeds of petunia ‘Madness Red’ and pansy ‘Delta Premium Yellow’ were sown into 288-cell (5-mL) plug trays at

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Jayesh B. Samtani, John B. Masiunas, and James E. Appleby

, knowledge on the impact of sublethal herbicide concentrations is scarce ( Marrs et al., 1991 ). Our objective was to determine the effects of field corn herbicides on white oak at different stages of development. Materials and Methods Two

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Rui Zhang, Fang-Ren Peng, Pan Yan, Fan Cao, Zhuang-Zhuang Liu, Dong-Liang Le, and Peng-Peng Tan

total dry weight, which was 1.37 times that of non-root-pruned seedlings. Fig. 2. Effect of root pruning at different development stages on first-year pecan seedling stem, root and total dry weight. Root pruning at each stage with 2/3 of the total length

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Atsu Yamasaki, Akira Kitajima, Norihiro Ohara, Mitsutoshi Tanaka, and Kojiro Hasegawa

differences in embryo development were caused by genetic or environmental factors. Table 5. Percentage of seeds in different embryo developmental stages at 14 weeks after pollination in BSY lines [hybrid seedlings of ‘Southern Yellow’ ( Citrus maxima

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Kaori Itagaki, Toshio Shibuya, Motoaki Tojo, Ryosuke Endo, and Yoshiaki Kitaya

trial of ‘Hokushin’. The growth conditions were the same as in the cotyledon-stage test. When the first true leaf had expanded and the second true leaf had begun to emerge, 10 seedlings of ‘Hokushin’ in trials 1 and 2, 15 of ‘Hokushin’ in trial 3, and 15

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Qingqing Duan, Ye Lin, Wu Jiang, and Danfeng Huang

been no study yet reporting on stomatal development of seedlings during storage. This study investigated the differences in stomatal development during storage under light or dark conditions and the associated photosynthetic performance. Accurately

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Aneela Nijabat, Adam Bolton, Muhammad Mahmood-ur-Rehman, Adeel Ijaz Shah, Rameez Hussain, Naima Huma Naveed, Aamir Ali, and Philipp Simon

relative cell injury at early and late seedling stages. Heat-tolerance levels observed at ES were not consistent with levels at LS, indicating independent genetic control for carrot heat tolerance at different stages of plant development, as has been

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Ute Albrecht and Kim D. Bowman

advanced stages of the disease. Blockage of the translocation stream as a result of infection with liberibacters as demonstrated by Achor et al. (2010) and Schneider (1968) appears to be a major factor of HLB symptom development. The effect of Ca . L