检索结果-南通市图书馆

Causes of Poor Grain Plumpness of Two-Line Hybrids and Their Relationships to the Contents of Hormones in the Rice Grain

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2007年第8期6卷 930-940页

作者： ZHAO Bu-hong ZHANG Hong-xi zhu qing-sen YANG Jian-chang Key Laboratory of Crop Genetics and Physiology of Jiangsu Province Yangzhou University Yangzhou 225009 P.R. China Lixiahe Region Agricultural Research Institute of Jiangsu Province Yangzhou 225007 P.R.China

This study was designed to elucidate the grain filling characteristics and the causes of poor grain plumpness of some two-line hybrid rice combinations and their hormonal mechanism. Six varieties, including three two-line hybrid rice combinations, that show differences in seed-setting and grain filling, were used. And the contents of starch, sucrose, zeatin （Z）＋ zeatin riboside （ZR）, indole-3-acetic acid （IAA）, and abscisic acid （ABA）, the ethylene evolution rate, activities of sucrose synthase （SuSase） and starch synthase （StSase） in grains, the seed-setting and grain filling rate were investigated. The correlations amongst these were analyzed. The results showed that the poor grain filling of two-line hybrids was mainly attributed to the higher unfilled grain rate and the lower filling degree of inferior grains. During the early and mid grain filling periods, the sucrose content in inferior grains was greater than that in superior grains for the combinations with poor grain filling, indicating that the substrate concentration was not the principal factor for their slow grain filling and poor grain plumpness of the inferior grains of two-line hybrids. Z ＋ ZR, IAA, and ABA in superior grains were obviously greater than those in inferior grains at early grain filling stage. The maximum and mean contents of Z ＋ ZR, IAA, and ABA were positively very significantly correlated with the maximum and mean grain-filling rate, filling degree, and grain weight. The evolution rate of ethylene was greater in inferior grains than in superior grains and greater for the combinations with poor grain plumpness than those with good grain plumpness at the early or mid filling stages. The evolution rate of ethylene was negatively and significantly correlated with the grain filling rate, the grain filling degree, and the grain weight. Spraying ethephon （ethylene-releasing agent） at the early grain filling stage increased the evolution rate of ethylene, reduced the ABA content and activit

关键词： two-line hybrid rice grain-filling hormonal regulation physiological mechanism

Symptom of the Shrunk-Grain Panicle and the Change Characteristics in Its Grain

在线全文

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2008年第1期7卷 10-18页

作者： ZHANG Zu-jian LANG You-zhong PAN Mei-hong YANG Jian-chang zhu qing-sen Key Laboratory of Crop Genetics and Physiology of Jiangsu Province Yangzhou University Yangzhou 225009 P.R.China

Over the past two years, an abnormal growth phenomenon Jiangsu Province of China. The phenomenon is described in called shrunk-grain panicle has occurred in a large area in details by figures and characters in this article. The method with a japonica rice Wuyujing 3 as the experimental material, the characteristics of grain morphology distribution and the grain weight were studied. Normal and shrunk-grain panicles were sampled from several representative areas. The length, width, and weight of the normal grains were distributed as regular, continuous, and single peaks. Plant growth typically had a right-leaning tendency. On the contrary, the distribution of the grain morphology and weight were irregular and nearly double that of the shrunk-grain panicle. The proportion of the cumulative distribution in the two kinds of peaks was closely related to the degree of shrunk-grain panicle. The article discusses the phenomenon＇s symptoms, problems, and diagnosis.

关键词： rice japonica shrunk-grain panicle symptom grain weight distribution

Effects of Lodging at Different Filling Stages on Rice Yield and Grain Quality

在线全文

学校读者我要写书评

暂无评论

Rice science 2012年第4期19卷 315-319页

作者： LANG You-zhong YANG Xiao-dong WANG Mei-e zhu qing-sen Key Laboratory of Crop Genetics and Physiology of Jiangsu Province Yangzhou University

The effects of lodging of rice plants from 20 d after full heading to maturity on yield and grain quality were investigated with a hybrid rice combination Liangyoupeijiu and a japonica rice cultivar CY-6. The results showed that, except for brown rice rate, almost all parameters for yield and grain quality including ratio of grain length to grain width, gelatinization temperature and gel consistency, were significantly influenced by lodging and thus deteriorated. Regression analysis suggested that, lodging one day earlier at the grain-filling stage could cause 2.66% to 2.71% of yield loss, 1.8 to 2.6 percentage points decrease of seed-setting rate, 0.26 to 0.32 g reduction of lO00-grain weight, 0.097 to 0. 155 percentage point decline of milled rice rate, as well as 0.13 to 0.27 percentage point increase of chalky grain rate, and 0.021 to 0.024 percentage point rise of protein content, and subsequently lower the eating quality.

关键词： rice lodging filling stage yield grain quality

Water-requirement Characteristics and Water-saving Irrigation Indices of Dry-raised Rice Seedlings in Paddy Field

在线全文

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2001年第1期 107-115页

作者： YANG Jian-chang WANG Wei WANG Zhi-qin LIU Li-jun DING Zhi-jia zhu qing-sen Agricultural College Yangzhou University Yangzhou 225009 Agricultural College Yangzhou University Yangzhou 225009 Agricultural College Yangzhou University Yangzhou 225009 Agricultural College Yangzhou University Yangzhou 225009 Seed Station of Yiling Township Jiangdu County Agricultural College Yangzhou University Yangzhou 225009

The dry-raised seedlings (D-RS)of rice had obvious superiority in tillering and growth after transplanting. Especially under the condition of water-saving irrigation or low soil moisture, D-RS had more productive tillers, higher dry matter accumulation, larger grain-filling rate, slower senescence of leaves and stronger root activity during ripening, and higher grain yield, compared with the moist-raised seedlings (MRS). D-RS had smaller yield reduction than M-RS when subject to heavy water stress. The results suggested that D-RS had the ability to adapt to lower soil moisture in paddy field. Basedon the response of D-RS to soil moisture at each growth stage, the water-saving and high-yielding irrigation indices through controlling lowlimit soil water potential were proposed, i.e. soil water potential was - 15 - - 20 kPa from the recovery to the criticalleaf-age of productive tillering, - 20 - - 40 kPa from the critical leaf-age of productive tillering to secondary branch-differentiating stage, - 15 - - 25 kPa from secondary branch-differentiating stage to 20 days after heading and - 25 - - 35 kPa from 21 to 45 days after heading.

关键词： Rice Dry-raised seedlings Soil water potential Irrigation indices

Source-Sink and Grain-Filling Characteristics of Two-Line Hybrid Rice Yangliangyou 6

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rice science 2006年第1期13卷 34-42页

作者： ZHAO Bu-hong WANG Peng ZHANG Hong-xi zhu qing-sen YANG Jian-chang Key Laboratory of Crop Genetics and Physiology of Jiangsu Province Yangzhou University Yangzhou 225009 China Lixiahe Region Agricultural Research Institute of Jiangsu Yangzhou 225007 China

With two-line hybrid rice Yangliangyou 6 （YLY6） and Liangyoupeijiu （LYPJ） and three-line hybrid rice Shanyou 63 （SY63） as materials, the source, sink and flow characteristics in association with grain filling were investigated. The seed-setting rate, grain filling degree and grain yield of YLY6 and SY63 were significantly higher than those of LYPJ. The export and transformation percentages of the matter in culms and sheaths of YLY6 and SY63 were significantly higher than those of LYPJ. Activities of sucrose synthase, adenosine diphosphoglucose pyrophosphorylase, starch synthase and starch branching enzyme in grains were higher for YLY6 and SY63 than for LYPJ, and were very significantly correlated with maximum grain filling rate, mean grain filling rate, grain filling degree and grain weight. The spikelet number, grain yield and total sink load per area of vascular bundle and phloem of YLY6 and SY63 were significantly smaller than those of LYPJ, and the greater the load, the lower seed-setting rate and the poorer grain filling. The transportation rate per area phloem of YLY6 was greater than that of LYPJ or SY63. The results suggest that YLY6 possesses strong source, great sink activity and efficient flow, which lay a physiological base for its high seed-setting rate and good grain filling.

关键词： hybrid rice source-sink characteristics grain filling enzyme activity

Effect of pyrite content on chalcopyrite flotation under different regrinding conditions

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 49-57页

作者： Zejun Wang qing Shi Guofan Zhang Yuxuan zhu Binbin Li School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources Central South UniversityChangsha 410083China

This study aimed to investigate the effect of varying pyrite(Py)content on copper(Cu)in the presence of different regrinding conditions,which were altered using different types of grinding media:iron,ceramic balls,and their mixture,followed by flotation in the cleaner *** flotation performance of rough Cu concentrate can be improved by changing the regrinding conditions based on the Py *** electron microscopy,X-ray spectrometry,ethylenediaminetetraacetic acid disodium salt extraction,and X-ray photoelectron spectroscopy studies illustrated that when the Py content was high,the use of iron media in regrinding promoted the generation of hydrophilic Fe OOH on the surface of Py and improved the Cu *** ceramic medium with a low Py content prevented excessive Fe OOH from covering the surface of chalcopyrite(Cpy).Electrochemical studies further showed that the galvanic corrosion current of Cpy-Py increased with the addition of Py and became stronger with the participation of iron media.

关键词： chalcopyrite regrinding media pyrite galvanic corrosion flotation

Source-sink Characteristics and the Translocation of Assi- milates in New Plant Type and Intersubspecific Hybrid Rice

在线全文

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2002年第2期1卷 155-162页

作者： YANG Jian-chang, ZHANG Wen-hu, WANG Zhi-qin, LIU Li-jun and zhu qing-sen( Key Laboratory of Crop Cultivation and Physiology, MOA , Yangzhou University, Yangzhou 225009) Key Laboratory of Crop Cultivation and Physiology MOA Yangzhou University Yangzhou 225009

Both new plant type (NPT) and intersubspecific hybrid rice (IHR) had large sink size (total number of spikelets per m2), however, poor grain filling limited their potential in the grain yield. Compared to the three-line indica hybrid of Shanyou 63 (CK), NPT and IHR showed higher photosynthetic potential, higher dry matter accumulation and higher ratio of dry weight to spikelets (total dry wt./total number of spikelets) from heading to harvest. But both exhibited a low export percentage and transfer ratio of assimilates, low partitioning of 14C to grains from labeled flag leaves, low harvest indices and low physiological activities (IAA content and activities of ATPase and starch synthase) of grains at early grain-filling stage. The physiological activities of grains at early filling stage were significantly correlated with the export percentage and transfer ratio of assimilates, ripened-grain percentage and grain plumpness (r = 0.85 - 0.95). The source-sink ratio (dry matter wt./spikelet and nonstructural carbohydrate/spikelet) at heading was positively correlated with physiological activities of grains (r = 0. 84 - 0. 97 ). It is suggested that low physiological activities of grains at early filling stage is attributed to low source-sink ratio at heading, and the low sink activity weakens the ability to remobilize assimilates into grains, and leads to poor grain filling in NPT and IHR.

关键词： Rice New plant type Intersubspecifiic hybrid Source-sink Assimilate translocation

Variation among Rice Cultivars in Root Acidification and Its Relation to Cadmium Uptake

在线全文

学校读者我要写书评

暂无评论

Rice science 2006年第4期13卷 278-282页

作者： LIU Jian-guo XU Hai CAI Guo-liang QIAN Min WANG De-ke zhu qing-sen Department of Environmental and Safety Engineering Jiangsu Polytechnic University Changzhou 213016 China Agricultural College Yangzhou University Yangzhou 225009 China

To understand the mechanisms of Cd uptake and accumulation in rice, soil acidification by root activities was investigated in six rice cultivars differing in Cd accumulation. The results showed a significant difference among the cultivars in pH of pot water and root exudate. Soil acidification abilities varied with rice cultivars. Both pH of pot water and root exudate were lower in indica cultivars than in japonica ones. The difference in root acidification was larger in Cd treated cultivars than the control. Under Cd stress, the pH of pot water and root exudate correlated negatively and significantly with Cd concentrations in rice plants. It was suggested that the soil acidification by root exudates, especially in Cd contaminated soils, may be one of the mechanisms responsible for Cd uptake in rice cultivars.

关键词： cadmium rice (Oryza sativa) root acidification uptake

Trinuclear gold-catalyzed site-selective alkylation of peptides

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年第1期68卷 249-256页

作者： qing-Yun Fang Chengyihan Gu Yinghan Chen Wencheng Yan Yong Liang Weipeng Li Chengjian zhu Jie Han Jin Xie State Key Laboratory of Coordination Chemistry Jiangsu Key Laboratory of Advanced Organic Materials Chemistry and Biomedicine Innovation Center (Chem BIC) School of Chemistry and Chemical Engineering Nanjing University Green Catalysis Center College of Chemistry Zhengzhou University State Key Laboratory of Natural Medicines China Pharmaceutical University

Selective modification of peptides has always been a challenging issue. The selective alkylation of peptides can alter the biological activity and physical properties of molecules, and it has gained significant research interest. We herein disclose an intriguing gold-catalyzed alkylation of peptides using bench-stable unactivated alkyl bromides under photoredox catalysis. A wide range of structurally diverse primary, secondary and tertiary alkyl bromides serve as effective coupling partners to precisely connect with the α-C(sp3)–H in glycine residue of peptides. This protocol demonstrates an exceptionally broad scope for alkyl halides and excellent tolerance for a wide range of useful functional groups. A series of relay transformations to construct cyclic peptides, to proceed click reaction and to realize peptide fluorescence labeling further enhance its synthetic practicality. In addition, mechanistic studies and density functional theory(DFT) calculations reveal an inner-sphere and subsequent outersphere single electron transfer(SET) mechanism.

关键词： gold catalysis peptide alkylation C-C coupling radical

同方期刊数据库