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Effect of Pregermination Treatments on Germination and Growth of Cottonseed at Suboptimal Temperatures 1
Author(s) -
Cole D. F.,
Wheeler J. E.
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/cropsci1974.0011183x001400030035x
Subject(s) - germination , gibberellic acid , biology , cottonseed , sowing , horticulture , gossypium , moisture , fiber crop , malvaceae , agronomy , zoology , botany , chemistry , organic chemistry
Various pregermination treatments were used to determine their effects on germination of cottonseed ( Gossypium barbademe L.) at suboptimum temperatures and to determine whether chilling injury was reduced by these treatments. ‘Pima S‐4’ cottonseed were preconditioned in water and gibbercllic acid (10‐ 3 M) at 10 and 30 C or in adenosine‐ 3′:5′.cyclic monophosphate( cyclic AMP,10‐ 4 M) at 30 C, or were hot‐water‐treated at 70 C for 5 rain. After being preconditioned, seed were chilled for 24 hours at 5 C in water. Seed were germinated over a temperature range of 15.5 to 30 C for 7 days on a thermogradient plate. Germination counts were made daily. The speed and percent of germination were higher for seed preconditioned at 30 C than at 10 C. Hot‐water treatment reduced the sensitivity of seed to gibberellic acid and reduced germination at all temperatures. Chilling injury was reduced by preconditioning in either water, gibberellic acid, or cyclic AMP. Our data suggest that satisfactory cotton stands may be obtained at suboptimum temperatures (below 31 C) by elevating seed moisture and/or treating with a growth regulator prior to planting.