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EFFECTS OF INDUCTION LEVEL ON MORPHOGENETIC ASPECTS OF ONSET OF SUMMER DORMANCY AND FLOWERING IN HORDEUM BULBOSUM L.

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Hordeum bulbosum is a vernalizable, facultative long-day plant that enters summer dormancy after flowering in spring. Onset of dormancy is characterized by development of a bulb with several dormant regeneration buds, and is closely linked with onset of reproductive development. This has been demonstrated quantitatively by the similarity between the responses of both processes to the combined effects of different levels of thermoinduction and photoinduction. In fully thermoinduced plants, only photoperiods longer than 10 h accelerated apex development, diminished the final number of leaves and spikelet-bearing nodes and resulted in earlier onset of dormancy. A strong positive interaction was observed between the effects of thermo- and photoinduction on the phenomena associated with onset of dormancy and initiation of flowering. The number of reproductive nodes was reduced by raising the level of either factor. Duration of the reproductive phase became shorter as photoinduction was increased, but was not affected by thermoinduction. The possible modes by which development of H. bulbosum in its natural habitat is affected by inductive environment factors is discussed.

Affiliations: 1: Department of Agricultural Botany, Faculty of Agriculture, The Hebrew University of Jerusalem

10.1080/0021213X.1981.10676918
/content/journals/10.1080/0021213x.1981.10676918
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/content/journals/10.1080/0021213x.1981.10676918
1981-05-13
2018-06-23

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