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Growth Analysis of Soybeans Treated with TIBA 1
Author(s) -
Tanner J. W.,
Ahmed Shabir
Publication year - 1974
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1974.0011183x001400030009x
Subject(s) - dry matter , biology , cultivar , canopy , yield (engineering) , glycine , growth rate , agronomy , horticulture , botany , amino acid , mathematics , biochemistry , materials science , geometry , metallurgy
A growth analysis study was employed in an attempt to understand the mechanism by which the growth regulator 2,3,5‐triiodobenzolc acid (TIBA) increases soybean [ Glycine max (L.) Merrill] yields. Four soybean cultivars were sprayed at flowering time with an aqueous solution containing TIBA. Under good growth conditions, seed yields were increased by the treatment; no yield response was shown when conditions were poor for growth. Latermaturing cultivars responded more than early‐maturlng cultivars. Total dry matter production and rate of total dry matter production were not altered by TIBA; however, both seed yield and rate of reproductive dry matter production were greater on treated than on control plots. The data support the theory that TIBA acts by slowing vegetative growth and increasing reproductive growth rather than the theory proposing that the increase occurs as a result of improved canopy efficiency. Breeding implications are discussed.