Flowering time plays significant role for the reproductive success of plants. If flowering is initiated at the wrong time, it will affect the number of seeds produced and significantly reduce reproductive success. Arabidopsis, as the premier model system for molecular and genetic analyses of plant development, has provided a substantial insight into important pathways and mechanisms of its architecture. Four major pathways to flowering have been characterized in Arabidopsis; including environmental induction through photoperiod, temperature, autonomous floral initiation, and regulation by gibberellins. Now a new pathway has been added to these known genetic pathways: age pathwa. Recently, targets of two age-regulated miRNAs (miR156 and miR172) have been implicated in the timely control of several phase transitions in various plant species.
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