期刊
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
卷 23, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/ijms23126598
关键词
maize; ZmCBM48-1; endosperm; starch synthesis; expression profiles
资金
- National Key Research and Development Program of China [2021YFF1000300]
- Anhui Provincial Natural Science Foundation [2008085MC70, 1908085QC133]
- Postdoctoral Science Foundation of Anhui Province, China [2020B411]
In this study, a novel starch regulatory gene, ZmCBM48-1, was identified, which was found to play a positive regulatory role in the starch synthesis pathway by up-regulating several starch synthesis-related genes. Furthermore, its overexpression in rice led to changes in the endosperm cell shape and starch structure of transgenic seeds.
Starch directly determines the grain yield and quality. The key enzymes participating in the process of starch synthesis have been cloned and characterized. Nevertheless, the regulatory mechanisms of starch synthesis remain unclear. In this study, we identified a novel starch regulatory gene, ZmCBM48-1, which contained a carbohydrate-binding module 48 (CBM48) domain. ZmCBM48-1 was highly expressed in the maize endosperm and was localized in the plastids. Compared with the wild type lines, the overexpression of ZmCBM48-1 in rice altered the grain size and 1000-grain weight, increased the starch content, and decreased the soluble sugar content. Additionally, the transgenic rice seeds exhibited an alterant endosperm cell shape and starch structure. Meanwhile, the physicochemical characteristics (gelatinization properties) of starch were influenced in the transgenic lines of the endosperm compared with the wild type seeds. Furthermore, ZmCBM48-1 played a positive regulatory role in the starch synthesis pathway by up-regulating several starch synthesis-related genes. Collectively, the results presented here suggest that ZmCBM48-1 acts as a key regulatory factor in starch synthesis, and could be helpful for devising strategies for modulating starch production for a high yield and good quality in maize endosperm.
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