Auxin herbicides Plant growth regulation

Acylanilides (abbreviated as anilides in this article) are generally used as selective pre- and/or post-emergence herbicides in paddy rice fields. The herbicidal activity of the anilides is similar to those exhibited by the auxin-like plant growth regulators. 

Since his undergraduate years, his research career has focused on the structure-activity relationships of bioactive compounds, starting with the auxin-type plant-growth regulators and herbicides. In 1961, he joined Corwin Hansch at Pomona College in Claremont, California, as a Postdoctoral Research Fellow. From 1961 to 1963, he and Hansch developed a novel procedure to quantitatively analyze structure-activity relationships of agrochemicals and medicines (QSAR). QSAR is regarded as a forerunner to the development of a number of recent computer-aided... 

The notion of using exogenous chemicals to control plant growth, and hence productivity, is not new. Many of the first commercial herbicides (auxin herbicides) were developed as a direct consequence of plant growth regulator research (see Chapter 1, Section 3.3). 

The first study relates to the identification and design of novel herbicides and plant growth regulators that act by inhibiting polar transport of the plant hormone auxin (100). Previous studies (101) had identified seven auxin transport inhibitors, from which it was possible to describe a three-component... 

Arvik et al. (1971), working with the herbicide picloram (which produces effects in higher plants similar to that of auxin-type synthetic growth regulators), found that it had no influence on the algae of a clay loam soil. These workers treated plots with this herbicide at 0.28, 0.56, and 1.12 kg/ha. Samples were collected from three soil levels, three, six, and 18 mon after treatment. None of the 16 species observed was qualitatively or quantitatively affected by the herbicide treatments. 

Growth regulators organic compounds, which in small quantities inhibit, accelerate or in some way influence physiological processes in plants. G.r. include natural (endogenous) substances, e.g. Phytohormones (see) and native inhibitors and many synthetic compounds, especially herbicides and Grot retardants (see). ITie Auxins (see) include natural and synthetic compounds. 

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