To provide key data for feeding oat breeding in Chengdu plain, the genetic diversity of agronomic traits of 179 oat germplasm accessions were objectivly evaluated in this research. 14 agronomic traits were evaluated, a morphological diversity index was calculated for each of them. The cluster and principal component analyses were performed for 10 selected quantitative traits among them. It was found that the trait with the highest genetic diversity index was length of flag leaf (H′=2.04), and the highest coefficient of variation (33.41%) was for vegetative tiller number. Cluster analysis divided the 179 oat germplasm accessions into five major groups. Group Ⅰ would provide excellent parent material for breeding seed varieties. Group Ⅱ was with potential for breeding high for tillering ability. Group Ⅲ was without obvious beneficial traits. The characters of group Ⅳ were general. Group Ⅴ was considered to provide excellent parent material for breeding projects involving multiple target traits. The principal component analysis reduced the 10 analyzed traits to 5 principal components which cumulatively explained 84.57% of the data variation. The first principal component was closely related to nutrient composition of forage grass. The second and the third principal component mainly reflected the leaf morphological characteristics. The fourth principal component mainly reflected tiller. The fifth principal component mainly reflected height. Tin summary, the 179 evaluated oat germplasm accessions introduced to Chengdu plain, have wide genetic diversity. Multivariate evaluation of measured traits indicated that accessions CF002393, CF003690, CF014719 and CF003691 can be used as parents to improve local oat varieties.

To accurately evaluate the resistance of wheat varieties in Huanghuai wheat area to the current circulating wheat stripe rust races, and to understand the disease resistance genes in the high-generation lines and their distribution in the wheat area, a total of 194 high-generation wheat lines from Hebei, Henan, Shandong and Anhui Provinces were collected from 2022 to 2023. CYR34 was used to identify the resistance of stripe rust fungus at seedling stage. Mixed races (CYR32, CYR33, and CYR34), artificial inoculation nurseries (Yangling, Shaanxi, YL) and natural disease nurseries (Jiangyou, Sichuan, JY) were set up to identify the resistance at the adult plant stage. Seventeen SNP markers of the 14 known disease resistance genes were used for molecular detection, and the genes that may be contained in the wheat lines were speculated. The result showed that 149 (76.40%) of the materials showed resistance to CYR34 at seedling stage. For the results of adult plant identification, 137 (70.62%) materials showed resistance in YL; 174 (86.60%) materials showed resistance in JY, and 124 materials (63.92%) showed disease resistance in both YL and JY environments. The results of molecular marker detection showed that the disease resistance genes carried in the lines were Yr6, Yr7, Yr9, YrZH84, YrSP, YrAS1676, Yr29, Yr30, Yr78, Yr86, and YrLT26, among which Yr6, Yr9, YrZH84, Yr30, and YrLT26 had a significant effect on the disease resistance of the lines, yet no materials containing Yr18 or Yr85 were detected in the lines. The combination of Yr7+Yr29+Yr9, Yr7+Yr29+YrZH84,Yr7+Yr29+YrZH84+YrSP,Yr7+Yr29+Yr9+YrZH84+YrSP and other resistance genes had good disease resistance in the field, which could be used as a reference in the breeding process. Compared with the results of stripe rust resistance in the wheat area in the past ten years, the resistance of wheat lines in the northern Huanghuai area was significantly enhanced, with 63.92% of the lines showing resistance. The level of disease resistance breeding still needs to be improved.

To clarify the effects of one-time basal application of different types of controlled-release fertilizers on rice-stubble wheat, a field experiment was conducted using the wheat cultivar Huaimai 139. Four types of controlled-release fertilizer treatments were applied: vegetable oil-coated controlled-release compound fertilizer (A, N 26%), polyurethane-coated controlled-release compound fertilizer (B, N 32%), polyurethane-coated controlled-release nitrogen fertilizer (C, N 43%), and water-based resin-coated nitrogen fertilizer (D, N 43%). A treatment with split application of urea was used as control (CK, nitrogen applied at a basal to tillering to jointing to booting ratio of 5∶1∶2∶2), and a non-nitrogen treatment (N0) was set up caculate the nitrogen efficiency. The dry matter production, nitrogen accumulation, yield and economic benefits of rice-stubble wheat under different treatments were analyzed. The results showed that, compared with CK, A and B treatments significantly reduced nitrogen accumulation from jointing to heading and from heading to maturity, as well as nitrogen use efficiency. In A and B treatments, the number of spikes, grains per spike, and thousand-kernel weight were significantly decreased, leading to lower yield. C treatment significantly increased nitrogen accumulation at all key growth stages, enhanced photosynthetic capacity, nitrogen use efficiency, dry matter accumulation at maturity, thousand-kernel weight, yield, and net economic benefits. Yields in 2021-2022 and 2022-2023 increased by 3.89% and 5.35%, respectively, and the net benefit in 2022-2023 increased by 3.27%. D treatment showed no significant difference compared with CK in nitrogen accumulation patterns or yield, indicating stable performance. In conclusion, one-time basal application of polyurethane-coated nitrogen fertilizer can effectively meet nitrogen demand during mid-to-late growth stages, optimize yield formation, and improve both yield and economic efficiency.

Wheat above ground biomass (AGB) serves as a crucial indicator for assessing its growth status. Currently, unmanned aerial vehicles (UAVs) equipped with various optical sensors have been extensively utilized for monitoring wheat AGB. However, in the late stages of wheat growth, high vegetation coverage hinders optical sensors from capturing information within the canopy, thereby diminishing the accuracy of AGB monitoring. To mitigate this issue, this study incorporated point cloud characteristic parameters (PCs), which are related to canopy height, as representative indicators of canopy structure for estimating AGB using spectral indices, including color indices (CIs) and vegetation indices (VIs). The accuracy of AGB estimation models was then compared before and after the inclusion of PCs. The results revealed variations in the effectiveness of AGB estimation using different characteristic parameters during the jointing, heading, and filling stages of wheat growth. In the training set, the effect of CIs was slightly lower than that of VIs, while in the validation set, it was marginally higher. Although PCs did not exhibit the most remarkable performance across the three key periods, their stability was notably strong, and certain canopy structural characteristics demonstrated potential for AGB prediction. When individual features were used for AGB prediction, the r² values ranged from 0.47 to 0.75. In contrast, integrating the three features of CIs, VIs, and PCs substantially enhanced the accuracy of the AGB estimation model. Specifically, during the three growth stages, the model's r² values were 0.79, 0.81, and 0.77, and the root mean square error (RMSE) was 0.42, 0.74, and 0.80 t·hm^-2, respectively. Among different types of remote sensing features, support vector machine regression (SVM) provided superior estimation results compared to Gaussian process regression (GPR). Therefore, by integrating the three features (CIs, VIs, and PCs) and employing the SVM algorithm, an effective estimation of wheat AGB can be achi.

To explore the effects of amino acid chelated zinc on the yield and quality of wheat, Zhengmai 1860 was used as the experimental material. The treatments included spraying 0.2% and 0.4% concentrations of zinc sulfate, zinc aspartate, and zinc glycinate after anthesis, with spraying water as the blank control. The effects of zinc spraying on the yield and quality of wheat were studied. The results showed that spraying 0.2% zinc aspartate significantly increased the 1 000-grain weight of wheat at the two experimental sites of Longting, Kaifeng and Dancheng, Zhoukou by 6.17% and 6.58%, respectively; significantly increased the grain yield of wheat at the two sites by 5.05% and 5.32%, respectively; and significantly increased the bulk density of wheat at the two sites by 2.16% and 2.32%, respectively. Spraying zinc significantly reduced the degree of softening of wheat flour at the two sites by 16.06% to 26.98% and 12.21% to 34.27%, respectively. Spraying zinc aspartate significantly increased the wet gluten content of wheat flour at the two sites by 5.72% to 10.51% and 5.28% to 6.53%, respectively; significantly increased the maximum resistance of dough at the two sites by 17.27% to 20.96% and 12.25% to 14.13%, respectively; and significantly increased the sedimentation index of wheat flour at Longting, Kaifeng site by 19.69% to 28.14%. Spraying 0.2% zinc glycinate significantly increased the wet gluten content of wheat flour at the two sites by 6.27% and 7.40%, respectively; significantly increased the resistance at constant deformation of dough at the two sites by 18.37% and 8.21%, respectively; and significantly increased the dough development time and stability time of wheat flour at the Dancheng, Zhoukou site by 36.53% and 30.78%, respectively. In conclusion, spraying 0.2% zinc aspartate after anthesis can increase the 1 000-grain weight, grain yield and test weight of wheat, reduce the degree of softening of wheat flour, and increase the wet gluten content and tensile resistance of dough.

To investigate the effects of nitrogen and phosphorus management during mid-late growth stages on starch and protein synthesis and accumulation in wheat grains, a study was conducted using the medium-strong gluten wheat cultivar Zhengmai 1860. Two single-factor completely randomized experiments were implemented across two locations (Kaifeng Longting and Zhoukou Dancheng) with consistent soil fertilization rates. Six nitrogen-phosphorus management treatments were established: CK (control): topdressing urea at jointing stage; Nt: twice topdressing urea at jointing and flowering stages; Nu: post-flowering spraying urea; P: post-flowering spraying K₂HPO₄; NtP: twice topdressing urea at jointing and flowering stages + post-flowering spraying K₂HPO₄; NuP: post-flowering spraying urea and K₂HPO₄. The study analyzed differences in grain soluble sugar content, starch synthase activity, starch content, amino acid content, nitrogen metabolism-related enzyme activity, protein content, dry matter accumulation at maturity, grain yield, and yield components under these treatments. The results showed that compared with CK, post-flowering urea or K₂HPO₄ spraying significantly increased grain soluble sugar content at both sites. Notably, the NuP treatment demonstrated a more substantial effect, registering an increase of 16.91 to 37.63 percentage points; Nt enhanced starch synthase activity only at Zhoukou Dancheng, while P significantly increased both bound and soluble starch synthase activities at both sites, with NuP exhibiting superior effects (18.34%—32.24% increase); Nt had no significant effect on starch content, but NtP significantly increased starch content at both sites. NuP improved starch content only at Kaifeng Longting; Nu increased amino acid content only at Zhoukou Dancheng, whereas NuP enhanced it significantly at both sites; NuP significantly boosted glutamine synthetase and glutamate synthase activities at both sites. Nt showed no effect on protein content, but NtP increased protein content at Zhoukou Dancheng, and the NuP treatment significantly increased the protein content in wheat grains at both experimental sites. During the maturity stage, the increase ranged from 3.35 to 3.68 percentage points; Both NtP and NuP significantly increased grain yield at both sites (8.12%—11.51%); In conclusion, combined treatments of twice topdressing urea at jointing and flowering stages with post-flowering K₂HPO₄ spraying (NtP) or post-flowering co-application of urea and K₂HPO₄ (NuP) effectively promoted starch and protein synthesis/accumulation and enhanced yield in wheat grains.

Cytokinin response regulators (RR), as important components of the cytokinin signaling pathway, perform critical functions in cytokinin signaling output and regulation of downstream gene signaling responses. In order to investigate the role of wheat RR genes in response to low-temperature stress, we cloned the A-type cytokinin responsive regulator gene TaRRA6-D from the wheat cultivar Dongnongdongmai 1 (Dn1), performed bioinformatics analysis, subcellular localization analysis, and promoter activity analysis under low-temperature. We also genetically transformed Arabidopsis wild type to create overexpression lines for phenotypic observation of root length and cold resistance evaluation. Bioinformatics analysis showed that the TaRRA6-D gene (TraesCS5D02G140200) was 1 088 bp in total length, with a coding sequence of 696 bp, which was localized to wheat chromosome 5D, and the encoded protein was an unstable hydrophobic protein. The phylogenetic tree analysis showed that the wheat TaRRA6-D protein was most closely related to the RR proteins of Aegilops tauschii and Hordeum vulgare. Transient expression analysis of transformed tobacco showed that TaRRA6-D protein was localized in the nucleus. Analysis of cis-acting elements in the promoter region of the gene showed that the TaRRA6-D promoter region contained cis-acting elements responsive to low-temperature, drought, light, and a variety of hormones. Expression pattern analysis of the transformed Arabidopsis thaliana lines showed that TaRRA6-D promoter activity was induced to express by low-temperature. Phenotypic observations showed that root length of the overexpression lines increased significantly compared with the wild type, with or without the addition of 6-BA. Seedling freezing resistance assay showed that seedlings of overexpression lines were significantly resistant to low-temperature compared with wild type, and 6-BA treatment significantly improved the freezing resistance of seedlings.

The late spring cold disaster caused by low temperature in spring occurs frequently in China. It is of great significance to analyze the gene regulation mechanism of wheat in response to low temperature to resist the genetic improvement. In this study, the gene expression characteristics of wheat young spikes subjected to low temperature during meiosis was analyzed using transcriptome technology under artificially controlled environmental conditions. The results indicate that low temperature during meiosis stage can cause damage to the ultrastructure of anther tissue, leading to a significant decrease in seed setting rate. The differentially expressed genes (DEGs) in young spikes under low temperature mainly involve pathways such as hormone signal transduction, photosynthesis, circadian rhythm-plants, sugar metabolism, DNA replication, etc. The encoding genes of actin depolymerization factor (ADF), late embryonic development abundant protein (LEA), CCCH zinc finger protein, etc. were significantly upregulated at all time points of low temperature treatment, which may be involved in regulating the resistance response of wheat spikes to low temperature.

The vernalization gene VRN-D1 locus includes three major allelic variations, namely the dominant allelic variations Vrn-D1a and Vrn-D1b related to spring growth habit and semi-winter growth habit, and the recessive allelic variation vrn-D1 related to winter growth habit. In order to clarify the effects of different allelic variations at the VRN-D1 locus on the heading date and cold resistance of wheat in the Huang-Huai winter wheat region, in this study, 156 wheat varieties (lines) were used to identify the phenotypic traits of heading date and cold resistance. The wheat materials carry the same allelic variations at the known major vernalization gene VRN-A1, VRN-B1, and VRN-B3 loci as well as the photoperiod gene Ppd-D1 locus, but have different allelic variations only at the VRN-D1 locus. The results showed that there were extensive variations at the heading date, over-wintering seedling mortality rate, and dead stem rate among the 156 wheat varieties (lines). Analysis of variance indicated that the heading date was mainly affected by genotype, environment, and the interaction between genotype and environment, while the over-wintering seedling mortality rate and dead stem rate were mainly affected by genotype and environment. There were significant differences in the heading date among the three allelic variations at the VRN-D1 locus, and the heading date from early to late ranked as Vrn-D1a, Vrn-D1b, and vrn-D1. Under all environmental conditions, the cold resistance of the recessive vrn-D1 was significantly better than that of the dominant Vrn-D1a and Vrn-D1b, with the average over-wintering seedling mortality rate decreased by 19.20% and 11.18%, respectively, and the average over-wintering dead stem rate decreased by 16.53% and 8.03%, respectively. Compared with Vrn-D1a, Vrn-D1b exhibited better cold resistance, with the average over-wintering seedling mortality rate and dead stem rate decreased by 8.02% and 8.52%, respectively. The results in this study provide important information for the utilization of different allelic variations at the VRN-D1 locus to improve the heading date and cold resistance.

Wheat germplasms are the important foundation for wheat breeding. In this study, the genetic diversity was analyzed for 40 wheat germplasms from Pingdingshan region using SSR molecular markers. Results showed that the percentage of polymorphic bands for SSR primers ranges from 35% to 100%, with an average of 74.5%. A total of 164 polymorphic bands were obtained by 29 pairs of SSR primers, with an average of 5.60 bands for a single pair of SSR primers. The effective number of alleles, Nei's gene diversity index, and Shannon's information index of SSR primers ranged from 1.17 to 1.66, from 0.11 to 0.38, and from 0.17 to 0.55, respectively, with the average values of 1.43, 0.26, and 0.39, respectively. The genetic similarity coefficient between different wheat germplasms is distributed between 0.55 and 0.98, with an average of 0.77. Based on the genetic similarity coefficient, the 40 wheat germplasms can be divided into five groups. Of them, group I contained three wheat germplasms; group Ⅱ contained eleven wheat germplasms; group Ⅲ contained five wheat germplasms; and group IV contained three wheat germplasms. Group Ⅴ contained the largest number (eighteen) of wheat germplasms, accounting for 45.0% of the total wheat germplasms. The result of principal component analysis was basically consistent with the results of cluster analysis. In addition, DNA fingerprints of the 40 wheat germplasms were constructed with SSR primers.