@article {Duan:2014:0960-7412:547,
title = "SMALL GRAIN 1, which encodes a mitogenactivated protein kinase kinase 4, influences grain size in rice",
journal = "The Plant Journal",
parent_itemid = "infobike://bsc/tpj",
publishercode ="bp",
year = "2014",
volume = "77",
number = "4",
publication date ="2014-02-01T00:00:00",
pages = "547-557",
itemtype = "ARTICLE",
issn = "0960-7412",
eissn = "1365-313X",
url = "https://www.ingentaconnect.com/content/bsc/tpj/2014/00000077/00000004/art00005",
doi = "doi:10.1111/tpj.12405",
keyword = "panicle size, rice, cell proliferation, SMG1/OsMKK4, grain size",
author = "Duan, Penggen and Rao, Yuchun and Zeng, Dali and Yang, Yaolong and Xu, Ran and Zhang, Baolan and Dong, Guojun and Qian, Qian and Li, Yunhai",
abstract = "Although grain size is one of the most important components of grain yield, little information is known about the mechanisms that determine final grain size in crops. Here we characterize rice small grain1 (smg1) mutants, which exhibit small and light grains, dense and
erect panicles and comparatively slightly shorter plants. The short grain and panicle phenotypes of smg1 mutants are caused by a defect in cell proliferation. The smg1 mutations were identified, using a mapbased cloning approach, in mitogenactivated protein kinase
kinase 4 (OsMKK4). Relatively higher expression of OsMKK4/SMG1 was detected in younger organs than in older ones, consistent with its role in cell proliferation. Green fluorescent protein (GFP)OsMKK4/SMG1 fusion proteins appear to be distributed ubiquitously in plant cells.
Further results revealed that OsMKK4 influenced brassinosteroid (BR) responses and the expression of BRrelated genes. Thus, our findings have identified OsMKK4 as a factor for grain size, and suggest a possible link between the MAPK pathways and BRs in grain growth.",
}