Os04g0598300
The rice gene Os04g0598300 was reported as APO2 in 2012 by researchers from Japan[1].
Contents
Annotated Information
Gene Symbol
- Os04g0598300 <=> RFL, OSL, FL, APO2, APO2/RFL
Function
- The rice aberrant panicle organization 2 (apo2) mutant which exhibits small panicles with reduced number of primary branches due to the precocious formation of spikelet meristems. The apo2 mutants also display a shortened plastochron in the vegetative phase, late flowering, aberrant floral organ identities and loss of floral meristem determinacy.
- APO2/RFL and APO1, the rice ortholog of Arabidopsis UNUSUAL FLORAL ORGANS, act cooperatively to control inflorescence and flower development.
- APO2/RFL plays a role in suppressing the transition to spikelet meristems.
Expression
Figure 5. Localization of APO2 transcripts in wild-type plants. [1].
- In the vegetative phase, APO2/RFL was expressed in shoot meristems and leaf primordia (Figure 5a), in contrast to the result of Kyozuka et al. (1998)[2] who did not detect the expression in the vegetative meristems. Because apo2 mutants exhibited several phenotypes in vegetative phase, the expression in shoot apical meristems would be reasonable.
- In the reproductive phase, APO2/RFL was expressed in the meristems of primary and secondary branches at primordial and elongating stages (Figure 5b,c), but the expression transiently downregulated from the meristems at stage In5 (Figure 5d). When spikelets were differentiated, APO2/RFL expression was recovered in floral meristems and in primordia of all floral organs, including lodicules, stamens, carpels and ovules (Figure 5e–h). This unique expression pattern during the reproductive phase has not been reported to date. Since the timing of the downregulation coincided with that of the meristem identity change from inflorescence to spikelet and the mutant inflorescence phenotypes seemed to be independent from those in spikelets/flowers, APO2/RFL may independently function between inflorescence and the spikelet/flower stages.
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Labs working on this gene
- Graduate School of Agriculture and Life Sciences, University of Tokyo, Yayoi, Bunkyo, Tokyo 113-0032, Japan,
- National Institute for Bioresources, Okayama University, Kurashiki, Okayama 710-0046, Japan, and
- National Institute of Agrobiological Sciences, Tsukuba, Ibaraki 305-8602, Japan
References
- ↑ 1.0 1.1 Ikeda-Kawakatsu K, Maekawa M, Izawa T, Itoh J, Nagato Y. ABERRANT PANICLE ORGANIZATION 2/RFL, the rice ortholog of Arabidopsis LEAFY, suppresses the transition from inflorescence meristem to floral meristem through interaction with APO1. Plant J. 2012 Jan;69(1):168-80. doi: 10.1111/j.1365-313X.2011.04781.x. Epub 2011 Oct 25. PubMed PMID: 21910771.
- ↑ Kyozuka, J., Konishi, S., Nemoto, K., Izawa, T. and Shimamoto, K. (1998) Down-regulation of RFL, the FLO/LFY homolog of rice, accompanied with panicle branch initiation. Proc. Natl Acad. Sci. USA, 95, 1979–1982.
