Studia Forestalia Suecica
نویسنده
چکیده
Forekomst av gibberellinliknande substanser hos gran (Picea abies (L.) Karst.) och deras betydelse for tillvaxt och blomning Abstract ODC 161.4-174.7 Growing shoots and young seedlings of Norway spruce (Picea abies) contain at least six different gibberellin-like substances; most probably none o f them is identical to gibberellic acid or gibberellin A l. The gibberellin-like substances are all active in a specially designed spruce seedling bioassay, as well as in a number o f traditional gibberellin bioassays. Young spruce seedlings grown in nutrient solution are retarded by the substances Amo-1618, B-995, and CCC. Both root and shoot growth are affected. Gibberellic acid counteracts the effects o f all the retardants on shoot growth, and of Amo-1618 on root growth, but has no effect when supplied alone. Application o f the growth retardants B-995 and CCC to spruce grafts in a seed orchard results in decreased flowering. Preliminary results show, that flowering and non-flowering grafted spruce clones display remarkable differences in the dynamics o f gibberellin-like substances; a high content of these substances during the supposed time o f flower bud initiation is correlated to good flowering ability. All these findings are consistent with the hypothesis, that gibberellins are intimately involved in the process o f flower bud induction. Literature dealing with the occurrence and effects of gibberellins within the class Coniferopsida is summarized.
منابع مشابه
Studia Forestalia Suecica
ODC 232.318 (213) Seeds or fruits of 165 forestry species from nine tropical countries were investigated by x-ray radiography. The results showed that the method can be reliably used for detecting empty, filled, insect-attacked, mechanically damaged and diseased seeds or fruits. The applications o f x-ray radiography in tropical forestry for cone, fruit and seed collection, seed processing, nur...
متن کاملStudia Forestalia Suecica
ODC 232.315 015.28 The ultrastructure of three parts (endos.vernz, rootlets and cotyledorrs) of aged seeds o f Pinus sylvestris L. has been studied. In dry seeds no clear differences resulting from ageing are seen as compared with resting living cells, but during imbibition clear differences are evident. Inhibition of development of the D N A containing structures, mitochondria and plastids, wa...
متن کاملStudia Forestalia Suecica
Seed eluates on the germination blotter-a germinability test? Urlaknde frosubstanser p& groningspapper-ett grobarhetstest? Abstract ODC 232.318: 174.7 Aged seeds o f Scots pine left different eluate spots on the blotter in a ger-ntinator after about 24 hours' incubation. Fresh seeds do not give o f f sucl~ eluates. Anlong the leached substances were found proteins, nucleic acids, anzino acids, ...
متن کاملStudla Forestalia Suecica
Ms received 1976-05-05 LiberForlag/Allmanna Forlaget ISBN 91-38-03190-6. lSSN 0039-3150 Berlingska Boktrpckeriet. Lund 1976
متن کاملSTUDIA FORESTALIA SUECICA Influence of photo- and thermoperiod on the initial stages of frost hardening and dehardening of phytotron-grown seedlings of Scots pine (Pinus silvestris L.) and Norway spruce (Picea abies
ODC 181.212: 181.222: 181.221.1-174.7(485) Seedlings o f Pinus silvestris (L.) and Picea abies ( (L.) Karst.), 16 weeks old, were hardened under various photoand thermoperiods. Dehardening after a period o f chilling was followed by exposure to various temperatures under long and short day conditions. The degree o f frost hardiness o f the seedlings was determined in freezing tests at -7', 11" ...
متن کاملSTUDIA FORESTALIA SUECICA Seasonal Variation of Pigments in Needles A Study of Scots Pine and Norway Spruce Seedlings Grown under Different Nursery Conditions
ODC 164.5: 161(485j[-174.7 Pinus sylvestris + 174.7 Picea abies] The influence of growing conditions upon the pignzentation in needles from xeedlings o f Scots pine and Norway spruce has been studied. The plant material was grown either in the open or in plastic greenhouses. The greenhouses were covered with plastic during the vegetation periods from May to August, and during the rest of the ye...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2004