منابع مشابه
Plant Growth Regulators
Plant growth regulators are hormone-like chemicals that occur naturally in plants, and play a central role in their growth and development. Five major classes of plant growth regulators have been identified as plant hormones, but scientists believe that there are more waiting to be discovered. The five growth hormones include auxins, gibberellins, cytokinins, abscisic acid, and ethylene. Collec...
متن کاملButenolides from plant-derived smoke: natural plant-growth regulators with antagonistic actions on seed germination.
Smoke plays an intriguing role in promoting the germination of seeds of many species following a fire. Recently, a bicyclic compound containing a condensed butenolide moiety, 3-methyl-2H-furo[2,3-c]pyran-2-one (1), was reported as a potent germination promoter from plant-derived smoke. In this study, a related butenolide, 3,4,5-trimethylfuran-2(5H)-one (2), which inhibits germination and signif...
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Plant growth regulators (PGRs) are exogenously applied chemicals that alter plant metabolism, cell division, cell enlargement, growth and development by regulating plant hormones or other biological signals. For example, some PGRs regulate stem elongation by inhibiting biosynthesis of gibberellins or through releasing ethylene. PGR effects are widely studied and reported on barley (Hordeum vulg...
متن کاملNew Plant Growth Regulators in Cotton
Over ajbz, I-yearperi'oda range of"ewplantgrowih regularors was tes!ed. or'Ihese onlyAl"G showed any realpromise a detailed report on Ihisprodwc!is avqi7ab/e elsewhere in !heseproceedi'rigs. Work on Pix coi!/71med Iha!short deterinmate culli'vars such as S40 are particularly sensi'ti^e 10 the mappropri'atoprogram apptrca!10n of PI:x, SI!ff'err'rigyie/d losses of between 5 i0 21% when PI::cis us...
متن کاملThe Ortho Effect in Plant Growth-regulators.
Introduction In an earlier publication (2) a comparison was made of the growth regulating activites of various compounds as indicated by the elongation of sections of Avena coleoptiles. From this comparison it was seen that the substitution of various halogen atoms in the phenoxyacetic acid (POA) structure increased its effect on elongation except when both ortho positions were occupied. Also, ...
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ژورنال
عنوان ژورنال: Nature
سال: 1964
ISSN: 0028-0836,1476-4687
DOI: 10.1038/2041240a0