Search Results

You are looking at 1 - 10 of 761 items for :

  • Refine by Access: All x
Clear All
Full access

Brandon M. Miller and William R. Graves

, are considered important for posttransplant establishment and survival ( Schultz and Thompson, 1990 ). Initiation of lateral roots is stimulated by auxin and other growth regulators ( Esau, 1965 ). Plant growth regulators have been used with other

Open access

Michele R. Warmund, David H. Trinklein, Mark R. Ellersieck, and Reid J. Smeda

Auxin herbicides have been registered for postemergence control of broadleaf weeds in agricultural crops for more than 50 years ( Peterson et al., 2016 ). Since their initial development, different formulations of auxin herbicides, such as 2,4-D

Free access

Ying Gao, Hao Liu, and Dong Pei

on morphology is easy, but the relationship between the morphology and physiology of walnut catkins has not been established. Auxin is an essential hormone that has been implicated in many aspects of plant growth and development ( Woodward and Barrel

Full access

Ji-Yu Zhang, Zhong-Ren Guo, Rui Zhang, Yong-Rong Li, Lin Cao, You-Wang Liang, and Li-Bin Huang

with varying concentrations of selected auxins and different combinations of media and air temperatures. Materials and methods Plant materials. Pecan seeds were harvested at maturity in Oct. 2012 and planted in Feb. 2013 in a greenhouse at the Nanjing

Full access

Eugene K. Blythe and Jeff L. Sibley

is preferred as cutting material ( Berry, 1994 ). Auxin treatment has traditionally been recommended and used in commercial propagation for rooting cuttings. Knight et al. (1993) rooted stem cuttings of ‘Dwarf Burford’ holly prepared from dormant

Free access

V. Tuli

3-Methyleneoxindole (MO), a metabolite of the plant auxin 1- H-indole-3-acetic acid (IAA), is a potent sulfhydryl reagent that can profoundly affect bacterial growth and metabolism. For investigative purposes, MO is obtained from the degradation of 3-bromooxindole-3-acetic acid (3-Br-lAA) in aqueous media. Alternatively, it can be prepared from the riboflavin-catalyzed photooxidation of IAA. My earlier claims that MO possesses auxin activity were refuted by independent investigators either because the results could not be reproduced when 3-Br-IAA was used, or the results were ascribed to contamination with residual IAA if MO obtained from photooxidation was used. Recent investigations indicate that, contrary to previous assumptions, the quantitative degradation of 3-Br-lAA resulting in the formation of MO is not instantaneous; depending on the purity of 3-Br-lAA, it may take several hours to several days to reach completion. Furthermore, aqueous solutions of MO ≥0.1 mm are rapidly polymerized, thus causing a loss of biological activity. These findings may explain why MO that is derived from 3-Br-lAA often fails to produce auxin action. Ultrapure MO, obtained from either 3-Br-IAA or photooxidation, is 50- to 1000-fold as effective as IAA in the straight growth assay, induction of xylogenesis in parenchymatous tissue, and rooting of explants in tissue culture.

Full access

Eugene K. Blythe

requirement of an auxin treatment to promote rooting of the cuttings has not been noted. Comparing rooting of softwood and hardwood cuttings of confederate rose during the winter, spring, and monsoon seasons in India, Pandey and Vaish (1990) determined that

Open access

Jenny B. Ryals, Patricia R. Knight, and Eric T. Stafne

was to evaluate the effect of auxin sources on rooting for seven species of passion fruit. Materials and methods The seven passion fruit species chosen were banana passion fruit, blue passionflower, two maypops (one from Mississippi and one from

Open access

Liang Zheng, Zibin Xiao, and Weitang Song

rooting capacity ( Pacurar et al., 2014 ). Exogenous environmental conditions including temperature, water and oxygen supply, and auxin application are also critical for promoting the quality of rooting and improving the survival rate of cuttings ( Geiss

Free access

Catarina P. Carvalho, Alejandra Salvador, Pilar Navarro, Adela Monterde, and Jose M. Martínez-Jávega

exposure to ethylene must be adequate using optimum conditions of temperature, ethylene concentration, humidity, and air renewal ( Cuquerella et al., 2004 ). The synthetic auxin 2,4-dichlorophenoxyacetic acid (2,4-D) is a plant growth regulator that has