Download Germination Control. Metabolism, and Pathology by T. T. Kozlowski PDF
By T. T. Kozlowski
Seed Biology, quantity II: Germination regulate, Metabolism, and Pathology is part of a three-volume treatise, which goals to compile a wide physique of significant info on seed biology.
Organized into 5 chapters, this e-book starts with a dialogue on environmental keep an eye on of germination and its organic importance. Separate chapters persist with that debate body structure and metabolism of seeds with particular dormancy and anomalous garage heritage, in addition to these germinated less than irregular stipulations.
This paintings could be necessary to numerous teams of study biologists and lecturers, together with agronomists, plant anatomists, biochemists, ecologists, entomologists, foresters, horticulturists, plant pathologists, and plant physiologists.
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Example text
In presence of stress the growth forces exerted by the embryo were insufficient to overcome the tensile strength of the coats unless they were amplified by activation of phyto chrome. This raises the possibility that the capacity of the embryo to grow is a function of its content of active phytochrome, and that any seed capable of germinating without the help of light can do so because it already con tains a sufficient amount of prefabricated active phytochrome. This possibility is supported by results showing that light sensitivity can be induced in light-insensitive varieties of lettuce, as well as in species such as tomato, where light sensitivity is relatively rare, even in absence of stress of any kind, by dark incubation at supraoptimal temperature (in lettuce: Evenari and Neumann, 1953a; Borthwick et ai, 1954) as well as by repeated or prolonged exposure to far-red light, both of which pre sumably reduce the content of active phytochrome (Macinelli and Borth wick, 1964; Mancinelli et al, 1966).
Lengthening the high temperature part of the cycle at the expense of the low tempera ture part resulted in a shortening of the lag phase (hastening the onset), and a reduction in final percentages of germination (Asakawa, 1957b). The implications of such effects on the kinetics of germination under natural conditions have been discussed above in Section I. Seeds of Oryzopsis miliacea (from dispersal units which had been pretreated in sulfuric acid) germinate in darkness to a limited extent at constant temper ature.
Although light intensity was not varied, the overall response to light appeared to be proportional to the total amount of energy, even when divided up into several exposures. When the intervening dark periods became excessively long, the response was progressively reduced. In seeds with such a response type, the energy for full promotion may have to accumulate over u period which is longer than that of the prevailing length of a single day. In the other response type, time is integrated and the period might exceed the prevailing length of a single day even when intensity of radiation is not limiting.