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      Panicle Apical Abortion 7 Regulates Panicle Development in Rice (Oryza sativa L.).

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          Abstract

          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, panicle apical abortion 7 (paa7), 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 H2O2 in paa7 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 paa7 were located in the 3'-UTR regions of LOC_Os07g47330, which was confirmed through complementary assays and overexpressed lines. Interestingly, LOC_Os07g47330 is known as FRIZZY PANICLE (FZP). Thus, PAA7 could be a novel allele of FZP. Moreover, the severe damage for panicle phenotype in paa7/lax2 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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          Author and article information

          Journal
          Int J Mol Sci
          International journal of molecular sciences
          MDPI AG
          1422-0067
          1422-0067
          Aug 22 2022
          : 23
          : 16
          Affiliations
          [1 ] State Key Laboratory of Rice Biology and Chinese National Center for Rice Improvement, China National Rice Research Institute, Hangzhou 310006, China.
          [2 ] Institute of Food Crops, Key Laboratory of Jiangsu Province for Agrobiology, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China.
          Article
          ijms23169487
          10.3390/ijms23169487
          9409353
          36012754
          d22c50c0-ca06-41d5-b47c-16dbf26ad15e
          History

          panicle apical abortion,3′-UTR,LAX2,rice
          panicle apical abortion, 3′-UTR, LAX2, rice

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