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Effect of Prolonged Geo‐stimulation and Presence of 32 P on the Elongation of Lateral Shoots of Decapitated Pea Seedlings
Author(s) -
HUSAIN SYED MUSHTAQ
Publication year - 1977
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1977.tb04047.x
Subject(s) - pisum , elongation , apical dominance , biology , seedling , shoot , stimulation , sativum , botany , lateral shoot , horticulture , axillary bud , tissue culture , biochemistry , endocrinology , materials science , metallurgy , in vitro , ultimate tensile strength
Abstract The effects of prolonged geo‐stimulation and presence of 32 P 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 32 P 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 32 P 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 32 P. Prolonged presence of 32 P in the seedlings had a deleterious effect on bud elongation.