Entity

Time filter

Source Type


Li Z.,Shandong Academy of Agricultural Sciences | Li Z.,National Engineering Laboratory for Wheat and Maize | Liu K.,Shandong Academy of Agricultural Sciences | Liu K.,National Engineering Laboratory for Wheat and Maize | And 13 more authors.
Maydica | Year: 2013

To increase summer maize grain yield in North China Plain, we conducted field experiments with three densities (3, 6, and 9 plants m-2) on two plant types (a flat type, LD981, and a compact type, LD818) during 2010 and 2011 summer maize growing seasons to study leaf area index (LAI), above ground dry matter accumulation, grain filling rate, and grain yield. The results indicated that with the density increased, the LAI in the both varieties enhanced; however, plant density at the rate of 9 plants m-2 significantly (LSD, P < 0.05) increased LAI in LD818. Increasing densities enhanced the above ground dry matter of LD818, but not of LD981. With the density increased, the grain filling rate in the both varieties declined, but during the later growing season, the grain filling rate in LD818 was higher than that in LD919. Irrespective of plant density at the rate of from 3 to 6 or 6 to 9 plants m-2, the grain No. per ear, 1,000-kernel weight, and ears No. per m2 in LD981 were all lower than those in LD818; this was the main reason why with the increased density, the population yield in LD981 was lower than that in LD818. These results indicate that in North China Plain, increasing plant density could enhance the grain yield of compact type summer maize. Source


Li Z.,China Agricultural University | Li Z.,Shandong Academy of Agricultural Sciences | Li Z.,National Engineering Laboratory for Wheat and Maize | Chen Y.,China Agricultural University | And 16 more authors.
Shengtai Xuebao/ Acta Ecologica Sinica | Year: 2012

In order to investigate high densities and planting methods of summer maize in north China, in 2010-2011, two varieties (Ludan 981, LD981, and Ludan 818, LD818) were selected and planted in two densities (6 0000 and 90000 plants/ hm2) at two planting methods (single and double plants at one place). In this experiment, eight treatments were designed to study the effect of planting methods on root-shoot development and grain yield of summer maize under high densities. The results showed that vertical distribution of canopy resulted in a trend that dry matter weight increased with planting density increased; however, root vertical distribution resulted in a opposite trend. Under high density conditions, there were different competitive ability of root and shoot between different maize varieties. The canopy of LD981 was more sensitive to space, and its space competition of root was stronger than that of the canopy, hence, the yield limiting factor of LD981 was the kernel storage capacity; however, the root of LD818 was more sensitive to space, and its space competition of canopy was stronger than that of the root, hence, the yield limiting factor of LD818 was the spike number per unit. Under the condition of 60000 plants/ hm2, the quality of canopy structure and function of LD981 was better, double plants at one place reduced competitive stress in the canopy, as a result, achieved root and shoot equilibrium. Hence, the population yield enhanced; under the condition of 90000 plants/ hm2, the quality of canopy structure and function of LD818 was better, double plants at one place alleviated root competition, the quality of canopy structure and function improved partly, therefore, the root and shoot coordinated, which let to the yield increased. Source


Zhang S.,Shandong Academy of Agricultural Sciences | Zhang S.,Key Laboratory of Wheat Biology and Genetic Improvement On North Yellow and Huai River Valley | Zhang S.,National Engineering Laboratory for Wheat and Maize | Song G.,Shandong Academy of Agricultural Sciences | And 29 more authors.
Journal of Biotechnology | Year: 2014

With the frequent occurrence of climatic anomalies, spring frost has become a significant limiting factor on wheat production, especially during the reproductive growth stage. A high-throughput sequencing technology was applied and a total of 54 million clean reads that corresponded to 7.44. Gb of total nucleotides were generated. These reads were then de novo assembled into 120,715 unigenes with an average length of 627. bp. Functional annotations were then obtained by aligning all unigenes with public protein databases. In total, 9657 potential EST-SSRs were identified, and 6310 primer pairs for 1329 SSRs were obtained. Meanwhile, a comparison of four tag-based digital gene expression libraries, which was built from the control and cold-treated young spikes were performed. Overall, 526 up-regulated and 489 down-regulated genes were identified, and GO and KEGG pathway analyses of those genes were further conducted. Based on these results, a series of candidate genes involved in cold response pathways were identified, and 12 of them were confirmed by qRT-PCR. The combination of RNA-Seq and digital gene expression analysis in this study provides a powerful approach for investigating the transcriptional changes and obtained a large number of unigenes annotated to public databases. © 2014 Elsevier B.V. Source

Discover hidden collaborations