PJB-2019-627
GhFPF1 REGULATES THE RELATIONSHIP BETWEEN ROOT SYSTEM AND SHADE AVOIDANCE
AMEER HUSSAIN JARWAR
Abstract
After germination of seed, in higher plants morphogenesis initiates from shoot and root apical meristems. Vegetative growth after a certain phase, the transition to flowering is brought about by the concerted action of endogenous and environmental factors that synchronize plants of a given species to ensure their reproductive development under optimal conditions. Concurrently with the transition to flower promoting factor 1 gene is explicit in the peripheral zone of apical meristems and in floral meristems of Arabidopsis. Constituent manifestation of FPF1 causes early flowering in Arabidopsis under the long-day and short-day conditions and leads to a shortened puerile phase as deliberated by the trichome distribution on the abaxial leaf surface. In the traditional late flowering mutants, over manifestation of FPF1 compensates partially for the late flowering phenotype, indicating that FPF1 acts downstream or in a parallel pathway to the mutated genes. The co-over expression of 35S::AP1 with 35S::FPF1 leads to a synergistic effect on the shortening of the time to flowering under short-day conditions. The co-over expression of 35S::FPF1 and 35S::LFY, however, shows only an additive reduction of flowering time and the conversion of nearly every shoot meristem, except the inflorescence meristem, to a floral meristem under the same light conditions. In addition, the constitutive expression of FPF1 attenuates the severe lfy-1 phenotype under short days and phenocopies to a great extent the lfy-1 mutant grown under long-day conditions. Thus, we assume that FPF1 modulates the competence to flowering of apical meristems.
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