Journal
DEVELOPMENT
Volume 146, Issue 1, Pages -Publisher
COMPANY BIOLOGISTS LTD
DOI: 10.1242/dev.172395
Keywords
NO TRANSMITTING TRACT; SEEDSTICK; Fruit; Gynoecium; Medial domain; Septum; Cell wall; Lipids; Polysaccharide; KAWAK
Categories
Funding
- Mexican National Council of Science and Technology (Consejo Nacional de Ciencia y Tecnologia, CONACyT) [243380, 219883, 254467, CB-2012-177739, FC-2015-2/1061, INFR-2015-253504, CB-2015-255069]
- European Union [691109]
- International European Fellowship-METMADS project (FP7 People: Marie-Curie Actions) [302606]
- Universita degli Studi di Milano (RTD-A)
- Marie Curie Actions (MSCA) [691109] Funding Source: Marie Curie Actions (MSCA)
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The gynoecium, the female reproductive part of the flower, is key for plant sexual reproduction. During its development, inner tissues such as the septum and the transmitting tract tissue, important for pollen germination and guidance, are formed. In Arabidopsis, several transcription factors are known to be involved in the development of these tissues. One of them is NO TRANSMITTING TRACT (NTT), essential for transmitting tract formation. We found that the NTT protein can interact with several gynoecium-related transcription factors, including several MADS-box proteins, such as SEEDSTICK (STK), known to specify ovule identity. Evidence suggests that NTT and STK control enzyme and transporter-encoding genes involved in cell wall polysaccharide and lipid distribution in gynoecial medial domain cells. The results indicate that the simultaneous loss of NTT and STK activity affects polysaccharide and lipid deposition and septum fusion, and delays entry of septum cells to their normal degradation program. Furthermore, we identified KAWAK, a direct target of NTT and STK, which is required for the correct formation of fruits in Arabidopsis. These findings position NTT and STK as important factors in determining reproductive competence.
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