Regulator response, plant growth

Although the exact role of boron in plants is unknown, several physiological and biochemical activities associated with tissue boron content have been supported experimentally. This review covers some recent work on the role of boron in (1) organic translocation in plants, (2) enzymatic reactions, (3) plant growth regulator response, (4) cell division, (5) cell maturation, (6) nucleic acid metabolism, (7) phenolic acid biosynthesis, and (8) cell wall metabolism. 

Brovm inoculated a variety of dicotyledons and monocotyledons grovdng in pots in natural soil v/ith Azotobacter paspali. The large increases in early plant grov/th v ere not due to nitrogenase activity around the roots but v/ere more characteristic of plant growth regulator responses. The culture filtrates v/ere as active as the complete culture and they contained materials v/ith lAA, gibberellin and cytokinin-like activity. Others made similar... 

Tables VIII and IX show responses of hydrilla explants to various plant growth regulators and to solstitialin. GA3, BA and solstitialin enhanced elongation at 10-4 or 10 5 M. Zeatin, on the other hand, dramatically increased new shoot initiation in apical explants but had little effect on 2-node explants.

The results presented here demonstrate that these approaches can be applied to Potamogeton sp. and Hydrilla verticillata. In both assay systems, typical responses to known plant growth regulators were observed in most cases. The unique response of P.nodosus to ABA however, clearly shows the importance of not relying solely on "classical" bioassays. 

The orsellinic acid derivative lasiodiplodin 84 and its de-O-methyl congener are found, i.a., in the roots of Arnebia euchroma, a plant which is used in traditional Chinese medicine. These compounds elicit diverse biological responses as inhibitors of prostaglandin biosynthesis, cyctotoxic agents, and plant growth regulators. 

There have been many studies testing regulators on plants, and attempts have been effect on insects. Table I provides representative studies. Table I. Examples of Insect Responses Regulators. the effect of growth made to measure this a summary of some to Applied Growth ... 

Walling, L. L. (2000). The myriad plant responses to herbivores. Journal of Plant Growth Regulation 19 195-216. 

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