Pivotal role of STIP in ovule pattern formation and female germline development in Arabidopsis thaliana

Author:

Petrella Rosanna1ORCID,Gabrieli Flavio1,Cavalleri Alex1ORCID,Schneitz Kay2ORCID,Colombo Lucia1ORCID,Cucinotta Mara1ORCID

Affiliation:

1. Università degli Studi di Milano 1 Dipartimento di Bioscienze , , Via Celoria 26, 20133 Milan , Italy

2. , Technical University of Munich 2 Plant Developmental Biology, School of Life Sciences , 85354 Freising , Germany

Abstract

ABSTRACT In spermatophytes the sporophytic (diploid) and the gametophytic (haploid) generations co-exist in ovules, and the coordination of their developmental programs is of pivotal importance for plant reproduction. To achieve efficient fertilization, the haploid female gametophyte and the diploid ovule structures must coordinate their development to form a functional and correctly shaped ovule. WUSCHEL-RELATED HOMEOBOX (WOX) genes encode a family of transcription factors that share important roles in a wide range of processes throughout plant development. Here, we show that STIP is required for the correct patterning and curvature of the ovule in Arabidopsis thaliana. The knockout mutant stip-2 is characterized by a radialized ovule phenotype due to severe defects in outer integument development. In addition, alteration of STIP expression affects the correct differentiation and progression of the female germline. Finally, our results reveal that STIP is required to tightly regulate the key ovule factors INNER NO OUTER, PHABULOSA and WUSCHEL, and they define a novel genetic interplay in the regulatory networks determining ovule development.

Funder

Università degli Studi di Milano

H2020 Marie Skłodowska-Curie Actions

Deutsche Forschungsgemeinschaft

Ministero dell'Università e della Ricerca

Publisher

The Company of Biologists

Subject

Developmental Biology,Molecular Biology

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