HD-ZIP II transcription factors have been acknowledged as key regulators of plant architecture, modulating it according to environmental stimuli through the interaction with several endogenous hormones. HOMEOBOX ARABIDOPSIS THALIANA 3 (HAT3) e ARABIDOPSIS THALIANA HOMEOBOX 4 (ATHB4) have been involved, alone or redundantly with other HD-Zip II, in the development of embryo, root, SAM, leaf and flower. In all these processes, HD-ZIP II have been strongly connected with auxin homeostasis (1). Within the flower, HAT3 and ATHB4 have been shown to regulate auxin-mediated organ polarity switch during gynoecium formation (2). Here we go into detail on the role of HAT3 and ATHB4 in the flower development. All flower organs are altered in the hat3 athb4 mutant, and the expressiveness of the phenotype is highly variable. Sepals and petals show jagged edges, while stamens show an alteration in anther architecture. In the most severe cases, all organs completely loose adaxial-abaxial polarity, and form completely radiali
ROLE OF HAT3 AND ATHB4 IN FLOWER DEVELOPMENT
SESSA G.;CARABELLI M.
2024
Abstract
HD-ZIP II transcription factors have been acknowledged as key regulators of plant architecture, modulating it according to environmental stimuli through the interaction with several endogenous hormones. HOMEOBOX ARABIDOPSIS THALIANA 3 (HAT3) e ARABIDOPSIS THALIANA HOMEOBOX 4 (ATHB4) have been involved, alone or redundantly with other HD-Zip II, in the development of embryo, root, SAM, leaf and flower. In all these processes, HD-ZIP II have been strongly connected with auxin homeostasis (1). Within the flower, HAT3 and ATHB4 have been shown to regulate auxin-mediated organ polarity switch during gynoecium formation (2). Here we go into detail on the role of HAT3 and ATHB4 in the flower development. All flower organs are altered in the hat3 athb4 mutant, and the expressiveness of the phenotype is highly variable. Sepals and petals show jagged edges, while stamens show an alteration in anther architecture. In the most severe cases, all organs completely loose adaxial-abaxial polarity, and form completely radialiI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
