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. 2010 Aug 13;16(1):3–18. doi: 10.1007/s12298-010-0005-y

The MIDASIN and NOTCHLESS genes are essential for female gametophyte development in Arabidopsis thaliana

Sier-Ching Chantha 1, Madoka Gray-Mitsumune 1, Josée Houde 1, Daniel P Matton 1,✉
PMCID: PMC3550630  PMID: 23572950

Abstract

Female gametophyte development in Arabidopsis thaliana follows a well-defined program that involves many fundamental cellular processes. In this study, we report the involvement of the Arabidopsis thaliana MIDASIN1 (AtMDN1) gene during female gametogenesis through the phenotypic characterization of plants heterozygous for an insertional mdn1 mutant allele. The MDN1 yeast ortholog has previously been shown to encode a non-ribosomal protein involved in the maturation and assembly of the 60S ribosomal subunit. Heterozygous MDN1/mdn1 plants were semisterile and mdn1 allele transmission through the female gametophyte was severely affected. Development of mdn1 female gametophyte was considerably delayed compared to their wild-type siblings. However, delayed mdn1 female gametophytes were able to reach maturity and a delayed pollination experiment showed that a small proportion of the female gametophytes were functional. We also report that the Arabidopsis NOTCHLESS (AtNLE) gene is also required for female gametogenesis. The NLE protein has been previously shown to interact with MDN1 and to be also involved in 60S subunit biogenesis. The introduction of an AtNLE-RNA interference construct in Arabidopsis led to semisterility defects. Defective female gametophytes were mostly arrested at the one-nucleate (FG1) developmental stage. These data suggest that the activity of both AtMDN1 and AtNLE is essential for female gametogenesis progression.

Keywords: Female gametophyte, Embryo sac, Gametogenesis, Midasin, Notchless, Ribosome biogenesis

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