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Gary Gardner

Plant Hormone Signaling. Peter Hedden and Stephen G. Thomas (eds.). 2006. Blackwell Publishing Ltd., Oxford, UK. 377 pp. $211.99, hardcover. ISBN-13:978-14051-3887-1; ISBN-10:1-4051-3887-4. Progress during the past decade in our understanding of

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Valtcho D. Zheljazkov, Tess Astatkie, Thomas Horgan, and S. Marie Rogers

plant hormones at three concentrations [methyl jasmonate (MJ) at 10, 100, and 1000 mg·L −1 ; gibberellic acid (GA3) at 10, 100, and 1000 mg·L −1 ; and salicylic acid (SA) at 10, 100, and 1000 mg·L −1 ]; Treatments 10 to 24 were the residual distillation

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Francisco Roman-García, María Patricia Yahuaca-Mendoza, Javier Farias-Larios, J. Gerardo López-Aguirre*, Sergio Aguilar-Espinosa, and María del Rocío Flores-Bello

The contribution of arbuscular endomycorrhizal fungus (AMF) on hormonal levels increase in chili plants, at different steps is currently unknown. In this experiment was evaluated the effect of Glomus sp. Zac-19, G. etunicatum and G. intraradices, inoculation mirasol and ancho cultivars, under greenhouse conditions. Plants were growing in pots containing 1 kg of substrate (3 sand: 1 soil ratio). The effect was measured on fresh fruit production and indolacetic acid, giberellin GA3 and 6-aminopurine concentration. Also plant parameters measured were: plant height, foliar area, stem diameter, root length, aerial fresh weight, total fresh weight, fruit weight and mycorrhizal colonization. All treatments were imposed using 16 replications in a full random design. Results shown that mycorrhizal colonization average of the three fungus was 44% in mirasol cultivar y 42% in ancho cultivar. Mycorrhizal colonization had an effect on growth and development in both cultivars, expressed in a greater height, leaf number, foliar area, total fresh weigh and fruit mass. Was registered an increase of 80% in the yield in inoculated plants respecting to control. Indolacetic acid and gibberellins concentration in shoots, were bigger in plants colonized by arbuscular mycorrhizal fungus (AMF) than in control. The 6-aminopurine levels in roots of colonized plants by AMF shown higher values. These results suggest that AM fungi modify the hormonal concentration and some growth factors in chili plants.

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Ying Liu, Huawei Song, Juming Zhang, and Michael D. Richardson

tips ( Lv et al., 2013 ; Neumann and Matzner, 2013 ). The effects of plant nutrients and hormones on the development and growth of plant root systems have been widely studied in recent years ( Christin et al., 2009 ; Liu et al., 2013 ; Tanimoto, 2012

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I. Baktir, S. Ulger, L. Kaynak, and David G. Himelrick

Changes in hormone concentrations in leaf, node, shoot tip, and fruit samples of three Turkish olive (Olea europaea L.) cultivars (`Gemlik', `Memecik', and `Tavsan Yuregi') were monitored at monthly intervals over two successive years of the alternate-bearing cycle. Concentrations of abscisic acid (ABA), indole acetic acid (IAA), gibberellic acid-like substances (GA), and kinetin-like cytokinin were determined and their relationship to flower bud formation were examined during “on” and “off” years. Results showed significant differences in IAA, ABA, GA3-like, and kinetin-like cytokinins between “on” and “off” cropping years in various tissues of olive trees. Relative balances between GA3-like and ABA concentrations of tissues appears to exhibit evidence of being a key regulator of floral development and alternate bearing.

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Rongcai Yuan, Walter J. Kender, and Jacqueline K. Burns

The effects of removal of young fruit and application of auxin transport inhibitors on endogenous indole-3-acetic acid (IAA) and abscisic acid (ABA) concentrations were examined in relation to the response of mature `Valencia' orange [Citrus sinensis (L.) Osb.] fruit to abscission materials. ABA concentrations were increased in the fruit abscission zone and pulp but not in the pedicel, peel, or seed of mature fruit by removal of young fruit during the period of reduced response of mature fruit to abscission materials in early May. However, removal of young fruit slightly decreased IAA concentrations in leaves and the abscission zone and pedicel of mature fruit but had no effect on the IAA concentrations in the peel, pulp, or seed of mature fruit. Young fruit had higher IAA concentrations in the abscission zone and pedicel than mature fruit. Application of 2,3,5-triiodobenzoic acid (TIBA), an IAA transport inhibitor, reduced IAA concentrations in the abscission zone of mature fruit but did not influence the IAA concentrations in the pedicel and peel when applied directly to an absorbent collar tied around the pedicel 2 cm above the fruit abscission zone during the less responsive period in early May. ABA concentrations were increased drastically in the fruit abscission zone and pedicel but not in peel by TIBA application. Applications of ABA, or IAA transport inhibitors such as naringenin, quercetin, or TIBA comparably increased the response of mature fruit to the abscission material 5-chloro-3-methyl-4-nitro-1 H-pyrazole (CMN-pyrazole) in early May. These data suggest that young fruit reduce the response of mature `Valencia' oranges to abscission materials through increasing IAA concentrations and decreasing ABA concentrations in the abscission zone of mature `Valencia' orangees.

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Xunzhong Zhang, Wenli Wu, Erik H. Ervin, Chao Shang, and Kim Harich

courses and other turf surfaces to save water. The complex regulatory processes of plant salt adaptation involve control of water flux, cellular osmotic adjustment, and hormonal regulation ( Golldack et al., 2014 ; Ryu and Cho, 2015 ). The decline of cell

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Sanalkumar Krishnan, Yingmei Ma, and Emily Merewitz

in turfgrass management, due to the widespread use of plant growth regulators and other substances altering plant growth physiology. An understanding of hormone responses is also critical for the development of germplasm with tolerance to abiotic and

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Eliezer E. Goldschmidt

For a long time, morphological observations, microscopes, and simple chemical analyses were fruit tree researchers’ major tools. However, then, toward the middle of the 20th century, horticulturists were enchanted by the plant hormone concept. The

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C. Olivella, C. Biel, R. Savé, and M. Vendrell

We thank Mrs. Anna M. Puerta for her help in analysis of hormones and plant water parameter determinations, and Mr. David Serra for plant maintenance in the greenhouse. This work was partially supported by the UE Research Project EC-DG VI PL