Decapitation of the pea plant resulted in the growth of all the lateral shoots. The initial growth of all lateral buds was somewhat similar. The differential growth rates developed later on. The pattern of growth of lateral shoots varied with the age of the plant when decapitation was performed. The basal shoots dominated when the plants were decapitated at the 2‐leaf stage. At 3‐leaf stage decapitation resulted in the dominance of shoot 5. Decapitation at 4‐or‐more‐leaf stage resulted in the eventual dominance of the suhterminal lateral shoot.
As a rule P‐32 moved to the most actively growing part of the plant, i.e. apex in intact vegetative plant, the growing lateral shoots in a decapitated plant, the elongating subapical parts of the stem and the roots. The various metabolic sinks seemed to compete actively for this nutrient, therefore P‐32 accumulation in any particular growing region of the plant was taken as an indicator of nutrient utilization potential of that part.
The stem apex of an intact plant seemed to loose its dominance with the increasing age of the plant. The loss of apical dominance was almost complete during the reproductive phase of the plant, during which the upper lateral shoots initiated growth. Their growth, however, was inhibited soon because of competition with the other developing sinks, viz., the flower and the fruit.
The amount of soluble carbohydrates in various parts of the pea plant followed essentially the same pattern as did P‐32 accumulation. These distribution patterns were apparently correlated with the growth of the plant.
Vitamins of the B group and vitamin C were applied to purple nutsedge (Cvpcrus rotundus L.) tubers to study their effect on the sprouting rate, initiation and establishment of sprouts, growth of plantlets and development of orthotropic rhizomes in comparison with the corresponding effects of kinetin. Ascorbic acid up to 100 mg 1"' hastened sprouting, whereas vitamins ofthe B group and kinetin retarded sprouting; 100% tubers sprouted in all treatments within 10 days.Unlike kinetin, none of the vitamins resulted in the establishment of more than one sprout per tuber. Riboflavin and pyridoxine promoted root and shoot growth of the plantlets, whereas kinetin produced short, thick shoots and inhibited root growth, with increasing concentration.Ascorbic acid was only second to kinetin in the induction of orthotropic rhizomes, but the former resulted in an increase in rhizome length.
The effects of prolonged geo‐stimulation and presence of 32P on 3‐leaf decapitated pea (Pisum sativum L. cv. Alaska) seedlings were studied with regard to lateral bud elongation as well as accumulation and recovery of isotope.
Prolonged geo‐stimulation favoured the dominance of basally located, upwardly directed buds and suppressed the elongation of subapical bud — a gravimorphic response similar to the one shown by intact geo‐stimulated branches of woody plants. Basal bud 2 was an exception as it dominated both in the above‐ and below‐axis position.
Accumulation of 32P in buds was the result of their own growth, whereas in the other parts of the seedlings accumulation of isotope was not necessarily related to growth.
Geo‐stimulation affected 32P recovery in redistribution experiments, whereas it had no effect in distribution experiments. In the former, the decrease in the isotope level in the seedling suggests a loss of 32P.
Prolonged presence of 32P in the seedlings had a deleterious effect on bud elongation.
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