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Abstract Detail


Noy-Porat, Tal [1], Eshel, Amram [2], Golubowicz, Sara [3], Sandler-Ziv, Dorit [3], Kamenetsky, Rina [3], Flaishman, Moshe [3].

Narcissus tazetta: physiological and biochemical aspects of the transition from vegetative to reproductive development.

Accurate timing of plant transition to the reproductive stage is an important adaptive trait that allows florogenesis and further anthesis under most favorable environmental conditions. Genetic and molecular analyses of different plant species revealed distinct but linked pathways that are responsible for detecting the major seasonal cues. However, information regarding the morpho-physiological and biochemical aspects of the transition from the vegetative to the generative stage in herbaceous perennial species is still limited. The effect of storage temperatures on florogenesis in bulbs of Narcissus tazettatext 'Ziva' was examined during three consecutive years. It was shown that the transition of the apical meristem from vegetative to reproductive state requires relatively high temperatures (25-30ºC). Low temperatures (12ºC) inhibited florogenesis completely, while 30ºC and higher, delayed the differentiation of the inflorescence and elongation of flower stalk. Temperature alternations between 20ºC and 30ºC were optimal and fulfilled the temperature requirement of both initiation and differentiation of the inflorescence and individual flowers. NLFtext, a gene homologous of AtLFYtext, was isolated from Narcissustext and characterized. NLFtext expression was detected at the apical meristem throughout its development. However, a significant increase in gene expression was observed during initiation of the inflorescence, afterward the expression decreased and increased again at the stage of formation of individual flower primordia in the inflorescence. NLFtext expression was also influenced by storage temperature. Our results indicate that temperature does not affect NLFtext directly, but might influence other genes, involved in NLFtext regulation.


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1 - Agricultural research Organization of Israel/ Tel Aviv university, Plant Sciences, P.o.b 6, Beit-Dagan, 50250, Israel
2 - Tel Aviv University, Plant Sciences
3 - Agricultural Research Organization of Israel, Plant Sciences

Keywords:
Narcissus
Florogenesis
temperature
LEAFY
meristem.

Presentation Type: Array
Session: TBA
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: 026
Abstract ID:791


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