Abstract：
:Loss of seed shattering has been regarded as a key step during crop domestication. Mutagenesis contributes to the development of novel crop cultivars with a desired seed-shattering habit in a relatively short period of time, but also to uncovering the genetic architecture of seed shattering. 'Minamiyutaka', a non-shattering indica rice cultivar, was developed from the easy-shattering cultivar 'Moretsu' by mutation breeding via gamma-ray irradiation. In present study, we observed significant differences in shattering habit, breaking tensile strength, and abscission zone structure between 'Moretsu' and 'Minamiyutaka'. Whole-genome mutation analysis of 'Minamiyutaka' newly identified a 13-bp deletion causing defective splicing in exon 3 of the OsSh1 gene which has previously been referred to as a candidate for controlling seed shattering. Using CRISPR/Cas9 gene editing, we demonstrated that loss-of-function mutation in OsSh1 causes non-shattering in rice. Furthermore, gene expression analysis suggests that OsSh1 may function downstream of qSH1, a known key gene involved in abscission zone differentiation. Nucleotide diversity analysis of OsSh1 in wild rice accessions and cultivars revealed that OsSh1 has been under strong selection during rice domestication, and a missense mutation might have contributed to the reduction of seed shattering from the wild progenitors to cultivated rice.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Li F,Komatsu A,Ohtake M,Eun H,Shimizu A,Kato Hdoi
10.1038/s41598-020-71972-1subject
Has Abstractpub_date
2020-09-10 00:00:00pages
14936issue
1issn
2045-2322pii
10.1038/s41598-020-71972-1journal_volume
10pub_type
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