The number of grains per panicle significantly contributes to rice yield, but the regulatory mechanism remains largely unknown. Here, we reported a loss-of-function mutant, (), which exhibited panicle abortion and degeneration of spikelets on the apical panicles during the late stage of young panicle development in rice. High accumulations of HO in caused programmed cell death (PCD) accompanied by nuclear DNA fragmentation in the apical spikelets. Map-based cloning revealed that the 3 bp "AGC" insertion and 4 bp "TCTC" deletion mutation of were located in the 3'-UTR regions of , which was confirmed through complementary assays and overexpressed lines. Interestingly, is known as (). Thus, could be a novel allele of . Moreover, the severe damage for panicle phenotype in double mutant indicated that PAA7 could crosstalk with Lax Panicle 2 (LAX2). These findings suggest that PAA7 regulates the development of apical spikelets and interacts with LAX2 to regulate panicle development in rice.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9409353 | PMC |
| http://dx.doi.org/10.3390/ijms23169487 | DOI Listing |
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