作者机构：
[Min HUANG; Li-qin HU] Crop and Environment Research Center for Human Health, College of Agronomy, Hunan Agricultural University, Changsha 410128, P.R.China
摘要：
China has 22% of the world's population but only 7% of the world's arable land. Food security has been a chief mission of the Chinese state since the beginning of the dynastic era and remains a primary objective in the early 21st century. As a result, high yield has been the first priority of farmers, researchers and agricultural agencies in China for a long time.
关键词：
Grain protein concentration;logistic regression;non-protein accumulation;protein accumulation;rice
摘要：
Protein in rice grains is an important source of nutrition for rice consumers. This study mainly aimed to identify the critical factors that determine grain protein concentration in rice. Accumulation parameters, including mean accumulation rate (R-mean) and active accumulation duration (D-active), for protein and non-protein components and their correlations with protein concentration in rice grains were investigated in field experiments conducted over two years with six rice cultivars. Results showed that grain protein concentration ranged from 9.6% to 11.9% across cultivars and years. Accumulation processes of protein and non-protein components were well fitted by the logistic equation for all six rice cultivars in both years, and the ratio of protein to non-protein for R-mean and D-active ranged from 0.08 to 0.12 and 1.01 to 1.33, respectively. Grain protein concentration was significantly correlated with protein to non-protein ratio for R-mean. This study suggests that grain protein concentration is not solely determined by the accumulation of protein or non-protein component, but by the coordination of protein and non-protein accumulation.
作者机构：
[Denardin, Luiz Gustavo de O.; Martins, Amanda P.; Anghinoni, Ibanor] Fed Univ Rio Grande do Sul UFRGS, Interdisciplinary Res Grp Environm Biogeochem, Soil Sci Res Program, BR-91540000 Porto Alegre, RS, Brazil.;[Ciampitti, Ignacio A.; Bastos, Leonardo M.] Kansas State Univ, Dept Agron, Manhattan, KS 66506 USA.;[Moojen, Fernanda G.; Carvalho, Paulo Cesar de F.] Univ Fed Rio Grande do Sul, Grazing Ecol Res Grp, Anim Sci Res Program, BR-91540000 Porto Alegre, RS, Brazil.;[Huang, Min] Hunan Agr Univ, Coll Agron, Changsha 410128, Peoples R China.;[Chabbi, Abad] French Natl Res Inst Agr Food & Environm INRAE, URP3F, F-86600 Lusignan, France.
通讯机构：
[Chabbi, Abad] F;French Natl Res Inst Agr Food & Environm INRAE, URP3F, F-86600 Lusignan, France.
关键词：
Cattle grazing;Glycine max;Lowland;Paddy fields;Soil chemical properties
作者：
Min Huang*;Jiana Chen;Fangbo Cao;Yu Liu;Zhengwu Xiao;...
期刊：
Journal of Cereal Science,2020年91:102902 ISSN：0733-5210
通讯作者：
Min Huang
作者机构：
[Huang M.; Chen J.; Cao F.; Liu Y.; Xiao Z.; Hu L.; Chen G.; Zou Y.] Crop and Environment Research Center for Human Health, College of Agronomy, Hunan Agricultural University, Changsha, 410128, China
通讯机构：
[Min Huang] C;Crop and Environment Research Center for Human Health, College of Agronomy, Hunan Agricultural University, Changsha, 410128, China
作者机构：
[Xiaohong Yin; Jiana Chen; Long Fan; Zui Tao; Min Huang; Yingbin Zou] Crop and Environment Research Center, College of Agronomy, Hunan Agricultural University, Changsha, 410128 China
通讯机构：
[Min Huang] C;Crop and Environment Research Center, College of Agronomy, Hunan Agricultural University, Changsha, 410128 China
通讯机构：
[Huang, Min] H;Hunan Agr Univ, Coll Agron, Crop & Environm Res Ctr Human Hlth, Changsha 410128, Peoples R China.
关键词：
Amylose content;early season rice;grain quality;grain yield
摘要：
Eating quality is of paramount importance to rice (Oryza sativa L.) consumers and soft rice with low amylose content has become popular in China This study was conducted to evaluate the performance of soft rice grown in the early season (ES) dominated by non-soft rice. Field experiments were conducted in Yongan and Santang, Hunan Province, China from 2016-2018. Results showed that grain amylose content in soft rice cultivars was consistently lower in the ES compared to the late season (LS). The lower grain amylose content in the ES compared to the LS was partly attributed to higher average daily mean temperature during grain filling. No significant relationship was observed between grain yield and seed amylose content in ES rice. Soft rice cultivars produced a similar average grain yield to non-soft rice cultivars in the ES. These results encourage breeders to develop more ES rice cultivars with soft texture to meet the consumer demand for this type of rice.
通讯机构：
[Huang, Min] H;Hunan Agr Univ, Coll Agron, Crop & Environm Res Ctr, Changsha 410128, Hunan, Peoples R China.
摘要：
Low light is a common environmental factor that adversely affects rice yields. This study was conducted to evaluate the combined effect of hill density and nitrogen (N) fertilizer rate on yield attributes in hybrid rice under low-light conditions. Field experiments were conducted in 2014 and 2015. Two hybrid rice cultivars (Y-liangyou 1 and Luoyou 9348) were grown under combinations of three hill density levels (high, 40 x 10(4) hills ha(-1); moderate, 27 x 10(4) hills ha(-1); low, 14 x 10(4) hills ha(-1)) and two N rate levels (high, 240 kg ha(-1); moderate, 143-148 kg ha(-1)), and shaded from heading to maturity. Grain yield was highest in the combination of high hill density and moderate N rate and significantly declined with decreasing hill density combined with increasing N rate for both cultivars in both years. Averaged across two cultivars and two years, grain yield declined by about 4% for each 10% decrease in hill density combined with each 10% increase in N rate. A significant reduction in spikelet filling percentage was observed with decreasing hill density combined with increasing N rate in Y-liangyou 1 in 2015 and Luoyou 9348 in 2014. The same trend was observed for grain weight in Y-liangyou 1 in 2014 and Luoyou 9348 in 2015. These results indicate that adopting the practice of decreasing hill density combined with increasing N rate can result in poor grain filling and consequently yield decline in hybrid rice under low-light conditions.
