Ethylene evolution and endo-beta-mannanase activity during lettuce seed germination at high temperature
نویسندگان
چکیده
منابع مشابه
Stimulation of lettuce seed germination by ethylene.
Ethylene increased the germination of freshly imbibed lettuce (Lactuca sativa L. var. Grand Rapids) seeds. Seeds receiving either red or far-red light or darkness all showed a positive response to the gas. However, ethylene was apparently without effect on dormant seeds, those which failed to germinate after an initial red or far-red treatment. Carbon dioxide, which often acts as a competitive ...
متن کاملEndo-β-mannanase Activity in Tomato and Other Ripening Fruits
High amounts of endo-β-mannanase (EC 3.2.1.78) activity were extracted from tomato (Lycopersicon esculentum Mill.) fruits when a high-salt-containing buffer was used. Two pI forms of the fruit enzyme were identified, one being much more basic than the many seed isoforms. The number of isoforms increased if a protease inhibitor was not used during extraction. The enzyme was found in the ripe fru...
متن کاملA germination-specific endo-beta-mannanase gene is expressed in the micropylar endosperm cap of tomato seeds.
Endo-beta-mannanase (EC 3.2.1.78) is involved in hydrolysis of the mannan-rich cell walls of the tomato (Lycopersicon esculentum Mill.) endosperm during germination and post-germinative seedling growth. Different electrophoretic isoforms of endo-beta-mannanase are expressed sequentially in different parts of the endosperm, initially in the micropylar endosperm cap covering the radicle tip and s...
متن کاملEffect of Temperature on the Short Chain Fatty Acid-induced Inhibition of Lettuce Seed Germination.
In lettuce, Lactuca sativa short chain fatty acids (C(6) - C(9)) vary in their effectiveness as inhibitors of germination according to temperature; the higher the temperature, the greater the inhibition. A linear relationship exists between temperature and the dose causing half-maximal germination. Nonanoic (C(9)) acid is the most effective.When extrapolated to the abscissa, really zero concent...
متن کاملStimulation of Lettuce Seed Germination by 6-(Substituted) Purines.
Presoaking several varieties of seed, especially lettuce, in various 6(substituted) aminoand thiopurine solutions has been found to increase their rate of germination (3, 5, 6). Recently it was also reported that these purine derivatives are synergistic with gibberellin in inducing these biological responses whereas gibberellin alone was only moderately active in stimulating germination of Earl...
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ژورنال
عنوان ژورنال: Scientia Agricola
سال: 2004
ISSN: 0103-9016
DOI: 10.1590/s0103-90162004000200006