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Kuan-Hung Lin, Shao-Bo Huang, Chun-Wei Wu and Yu-Sen Chang

stress. Both salicylic acid (SA) and calcium chloride (CaCl 2 ) are signal molecules known for their roles in plant adaptation to changing environments. They influence various stress responses and regulate the physiological and biochemical mechanisms in

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Cibele Mantovani, Jonas Pereira de Souza Júnior, Renato de Mello Prado and Kathia Fernandes Lopes Pivetta

salicylic acid concentrations after 300 d of in vitro cultivation. ** P < 0.01. Effect of SA on plant growth and development. The presence of SA reduced the number of leaves in the plants. The results of both examined species were compatible with a negative

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Huifei Shen, Bing Zhao, Jingjing Xu, Xizi Zheng and Wenmei Huang

d of recovery period, leaf samples were collected for physiological, biochemical, and phenotypical analysis. Table 1. Different treatments of salicylic acid (SA) and/or CaCl 2 applied to the leaves of Rhododendron ‘Fen Zhen Zhu’ for improving heat

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Uttara C. Samarakoon and James E. Faust

or 0 to 300 mg·L −1 salicylic acid (SA) to stock plants (n = 6); 1 mg·L −1 = 1 ppm. Discussion Calcium applied to poinsettias at or above 80 mg·L −1 in the form of Ca-EDTA can improve leaf mechanical strength. As reported in our previous studies

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Yang Yang, Runfang Zhang, Pingsheng Leng, Zenghui Hu and Man Shen

; Welling and Palva, 2008 ). Salicylic acid is a growth regulator in plants and is involved in many physiological processes ( Hayat et al., 2010 ; Miura and Tada, 2010 ), and plays an important role in both biotic and abiotic stress ( Ananieva et al., 2004

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Abdullah Ibrahim, Hesham Abdel-Razzak, Mahmoud Wahb-Allah, Mekhled Alenazi, Abdullah Alsadon and Yaser Hassan Dewir

). Salicylic acid is a natural growth regulator of vascular plants that influences several physiological and metabolic processes ( Jayakannan et al., 2015 : Rivas-San Vicente and Plasencia, 2011 ), such as photosynthesis, transpiration, ion uptake, and

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Hakan Aktas, Derya Bayındır, Tuba Dilmaçünal and M. Ali Koyuncu

/v) salicylic acid (an endogenous growth regulator). For both groups DW and MAS, the solutions were applied with a sprayer in equal volume (30 mL) to each tomato bunch. Five days after the beginning of treatments, the following variables of study were determined

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Huiling Wang, Wei Wang, Weidong Huang and Haiying Xu

unaffected, but 150 μ m Pac treatments influenced the cells’ regular growth ( Supplemental Fig. 1 ). Salicylic acid at various tested concentrations all induced flavonoid accumulation in cell cultures ( Supplemental Fig. 2 ). However, when the SA

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Meng-Yee Tee and Paul H. Jennings

Chilling injury can be a serious problem during field germination of sensitive crop species. Because heat shock has been shown to induce chilling tolerance of germinating cucumber seeds, an experiment was initiated to determine the effectiveness of other treatments. Cucumber seeds germinated 20 to 24 h were either heat-shocked at 50C for 2 min or treated with ABA or salicylic acid for 4 h. Following treatment, the germinated seeds were chilled at 2C for 96, 120, or 144 h and then incubated at 25C to determine growth effects on the developing root. All treatments induced chilling tolerance compared to the controls, with ABA and heat shock being most effective after chilling. There did not appear to be an additive response when heat shock was used in combination with ABA. The evidence for different treatment mechanisms will be discussed.

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Ahmet Korkmaz

The effects of incorporating plant growth regulators into the priming solution on low temperature germination and emergence percentage performance of sweet pepper (Capsicum annuum `Demre') seeds before and after seed storage were investigated. Seeds were primed in 3% KNO3 solution for 6 days at 25 °C in darkness containing one of the following: 1, 3, 5, or 10 μm methyl jasmonate (MeJA) or 0.05, 0.1, 0.5, or 1 mm acetyl salicylic acid (ASA). Following priming, seeds were either immediately subjected to germination and emergence tests at 15 °C or stored at 4 °C for 1 month after which they were subjected to germination test at 15 °C. Priming pepper seeds in the presence or absence of plant growth regulators in general improved final germination percentage (FGP), germination rate (G50) and germination synchrony (G10-90) at 15 °C compared to nonprimed seeds which had an FGP of 44%, G50 of 7.3 days and G10-90 of 7.3 days. Priming seeds in KNO3 solution containing 0.1 mm of ASA resulted in the highest germination percentage (91%), fastest germination rate (G50 = 2.2 days) and the most synchronous germination (G10-90 = 6.1 days). Emergence percentages were the highest for the seeds primed in the presence of 0.1 mm ASA (85%) and 3 μm MeJA (84%) while nonprimed seeds had an emergence percentage of 40%. Fastest emergence rates (E50) were also obtained from seeds primed in KNO3 supplemented with 3 μm MeJA (E50 = 15.2 days) and 0.1 mm ASA (E50 = 15.2 days). Shoot fresh and dry weights of pepper seedlings were significantly affected by priming treatments and priming in the presence of 0.1 mm ASA resulted in highest seedling shoot fresh and dry weights. Although all priming treatments improved germination performance of pepper seeds at 15 °C following 1 month of storage, inclusion of 0.1 mm ASA into the priming solution resulted in the highest germination percentage (84%) and germination rate (G50 = 3.8 days). These results indicate that priming seeds in 0.1 mm of ASA or 3 μm MeJA incorporated into the KNO3 solution can be used as an effective method to improve low temperature performance of sweet pepper seeds and that these seeds can be stored for 1 month at 4 °C and still exhibit improved germination performance at 15 °C.