The first step toward the discovery of cytokinins was the observation that a cell division plant growth substance
was found to occur in coconut milk (liquid endosperm) (Van Overbeek in 1941).
'There were a large number of pots, reflective insulation to provide maximum light and heat, convector heaters and a bag of a special growth substance
to make the plants grow.
The tallest plantlets of the cold treated cloves could be due to early production of [GA.sub.3] and other growth substances
ascribed to the cold treatment.
Plant growth substances
are well known to enhance the source-sink relationship and stimulate the translocation of photo-assimilates to sink, thereby helping in effective flower formation, fruit and seed development and ultimately enhancing the productivity of crops (Ammanullah et al., 2010).
* Chemical hazards: Contamination with chemicals used in agriculture and the production processes of raw materials such as antibiotics, plant growth substances
and pesticides, as well as food additives such as preservatives, and including chemicals that are used in the production/processing plant such as oil, grease and cleaning agents for equipment and machinery.
As inoculum density increased, the root weight also increased which might be due to the larger amount of growth substances
such as tryptophan and other amino acids when compared nematode un-inoculated plants (Anwar and Van Gundy, 1993; Setty and Wheeler, 1968).
It is evident that organic supplemented medium tends to show morphogenic responses as they are the sources of vitamins, amino acids, organic acids, alternative carbohydrates and growth substances
(George et al., 2008).
2nd International symposium plant growth substances
: intercellular hormonal signaling and applying agriculture Abstracts.
In an effort to determine the effects of homoeopathically potentised plant growth substances
on the shoot growth characteristics of dwarf peas, plant cultures were immersed for 24 hours in solutions containing 4 different plant growth substances
in 12X to 30X potencies.
For example, the section on regulation of root growth has chapters on each of the five major growth substances
, followed by chapters on root signals, environmental sensing, and even two chapters on gravitropism that look at the phenomenon from very different perspectives.
Our bodies produce less of these immune and growth substances