By Theodore T. Kozlowski, Stephen G. Pallardy, Jacques Roy

  • ''The booklet might be worthwhile for college kids and researchers already accustomed to plant body structure since it offers a good technique of having access to the first literature in a magnificent array of issues. The authors are to be counseled for a no-nonsense compilation of the massive literature on woody plant physiology.''
    --THE QUARTERLY overview OF BIOLOGY


    ''...this e-book provides a wide and necessary evaluation for college kids on woody vegetation and lots of fields of utilized and simple plant technological know-how. it may possibly even be used as a reference booklet for researchers.''
    --JOURNAL OF PLANT PHYSIOLOGY

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Oxygen availability to the embryo also may be increased by rupture of the seed coat. In phase IV, which occurs only in depleted storage tissues, the rate of respiration decreases as respiratory substrates are exhausted (Bewley and Black, 1982). When dormant sugar pine seeds imbibed water at 5~ they showed a rapid increase in O 2 uptake, ATE and moisture content during the first 4 days (Murphy and Noland, 1982). A plateau phase followed until 60 days, after which a second marked increase occurred in all three features as dormancy was broken.

However, isocitrate lyase activity increased earlier in the embryonic axis; in the cotyledons the increase occurred only after 3 weeks. Similar increases in isocitrate lyase activity during cold stratification were reported for seeds of Norway maple (Davies and Pinfield, 1980) and sugar pine (Noland and Murphy, 1984). Reserve proteins in seeds frequently are broken down by proteolytic enzymes to soluble nitrogen compounds which are then used in metabolism and growth of various parts of the seedling.

9University of Chicago Press. 12 (A-R) Changes in weight and composition of embryo, megagametophyte, and whole seed of Douglas fir during germination. D, Air-dried seed; S, stratified seed. From Ching (1966). During early germination, the lipids in the gametophyte decreased greatly and were used for embryo development. The dry weight of the embryo increased by 600%, and that of the megagametophyte decreased by 70%. In oily seeds a concomitant increase in activities of lipase, isocitrate lyase, and fructose 1,6-biphosphatase indicates metabolism of stored lipids by gluconeogenesis.

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