Analysis of Combining Ability of Drought Tolerance in Maize

By using complete-diallel cross design（Griffing method I）, the influence of the combination of different high-yield genotypes of maize on the drought tolerance of their offspring, the general combining ability, the specific combining ability and the back cross effect of drought tolerance between parents and the main genetic parameters for drought tolerance were analyzed. The result indicated that there were significant differences in general combining ability effects（GCA） of maize; there were highly significant differences in special combining ability effects（SCA）; there was no significant difference in reciprocal effects（R）. There were apparent differences in drought tolerance among six parents; to be specific, Zheng 58 had the highest drought tolerance, while PH4CV had the lowest. Improving drought-tolerant parents with Zheng 58, Ji 853 and Xinzi 8717 had gain superiority effects on the increase of drought tolerance in offspring. The influence of the genetic additive effect on the drought tolerance of offsprings varied with different parents and combinations. Therefore, the expression of drought tolerance inheritance genes was determined only by the additive and non-additive genetic effects but had little relationship with reciprocal effects. The selection of drought tolerance of maize should be conducted at higher generations.

Research on the Impact of Venture Risk Tolerance on R&D investments:Based on Entrepreneur Ability

How do start-ups enhance risk tolerance and core competition through product,technology,and service development?What is the relationship between the core competitiveness of start-ups and R&D investments?Based on the perspective of entrepreneurial ability,222 questionnaires were used to study the factors affecting the risk tolerance of start-ups and analyze the effect of risk tolerance on R&D investments.The research shows that the interactions of entrepreneur ability and start-up funds have a positive effect on the risk tolerance of start-ups,and the risk tolerance can positively promote R&D investment willingness and intensity for new products,technologies,and services.Also,R&D investment willingness plays a partial intermediary role between the risk tolerance of start-ups and the intensity of R&D investments.

Phosphorus Nutrient Characteristics of Different Maize (Zea mays L.) Inbreds for Tolerance to Low-P Stress

Phosphorus nutrient characteristics of different maize inbred lines to low-P stress were studied at stages of seedling, steming, earing, silking under pot culture. In the periods of seedling and steming, P uptake efficiency was the main contributor to P tolerance, and the relative P content in P-tolerant genotypes, 99180 and 99239 were higher than that in sensitive genotype, 99152. At earing stage, P-tolerant genotypes, compared to P-sensitive ones, had higher accumulation of P in upper leaves. When came to the silking stage, P uptake and redistribution efficiency of P-tolerant genotypes were higher than those in 99152. The results also suggested that there are different mechanisms of P nutrient uptake and distribution in different P-tolerant genotypes. Inbred line 99239, according to the investigation, was considered as an efficient stock in the P-uptake while 99180 fallen to the efficient stock of P redistribution.

Combining Ability and Genetic Effects of Germination Traits of Brassica napus L.Under Waterlogging Stress Condition

Cross combinations from six rapeseed cultivars and lines were evaluated under waterlogging stress condition in order to understand the genetic mechanism of waterlogging tolerance of Brassica napus L.and provide reasonable improvement programs.There were six germination traits investigated on combining ability and heritability using complete diallel crossing method designed for 30 combinations from those six cultivars and lines.The traits included relative root length,stem length,fresh weight per plant,survival rate,electrical conductivity,and vigor index.After flooding treatment,the six traits of parents and F1 were analyzed.The general combining ability（GCA） and special combining ability（SCA） of germination traits were analyzed using Griffing I method.Among 30 cross combinations,the GCA was significantly different among six waterlogging resistance traits.The SCA of these traits was significantly different except the SCA of electrical conductivity.As a representative trait of waterlogging tolerance in rapeseed,relative vigor index had the highest narrow heritability and relatively low broad heritability.The cultivars Zhongshuang 9 and P79 had higher tolerance potential to waterlogging stress.It can be concluded that combining ability and genetic effects of relative vigor index during germination stage could be used to identify the waterlogging tolerance of rapeseed in breeding program.

Genomic Prediction of Arsenic Tolerance and Grain Yield in Rice: Contribution of Trait-Specific Markers and Multi-Environment Models

Many rice-growing areas are affected by high concentrations of arsenic(As).Rice varieties that prevent As uptake and/or accumulation can mitigate As threats to human health.Genomic selection is known to facilitate rapid selection of superior genotypes for complex traits.We explored the predictive ability(PA)of genomic prediction with single-environment models,accounting or not for trait-specific markers,multi-environment models,and multi-trait and multi-environment models,using the genotypic(1600K SNPs)and phenotypic(grain As content,grain yield and days to flowering)data of the Bengal and Assam Aus Panel.Under the base-line single-environment model,PA of up to 0.707 and 0.654 was obtained for grain yield and grain As content,respectively;the three prediction methods(Bayesian Lasso,genomic best linear unbiased prediction and reproducing kernel Hilbert spaces)were considered to perform similarly,and marker selection based on linkage disequilibrium allowed to reduce the number of SNP to 17K,without negative effect on PA of genomic predictions.Single-environment models giving distinct weight to trait-specific markers in the genomic relationship matrix outperformed the base-line models up to 32%.Multi-environment models,accounting for genotype×environment interactions,and multi-trait and multi-environment models outperformed the base-line models by up to 47%and 61%,respectively.Among the multi-trait and multi-environment models,the Bayesian multi-output regressor stacking function obtained the highest predictive ability(0.831 for grain As)with much higher efficiency for computing time.These findings pave the way for breeding for As-tolerance in the progenies of biparental crosses involving members of the Bengal and Assam Aus Panel.Genomic prediction can also be applied to breeding for other complex traits under multiple environments.

容错动态性如何提升员工适应性绩效?——一个有调节的中介模型

员工适应性绩效是企业应对环境变化的重要基础,而容错动态性为解释员工适应性绩效提供了新视角。文章基于情绪事件理论、自我调节理论和资源保存理论,以306名科技型企业在职员工为调研对象,明晰了容错动态性对员工适应性绩效影响的路径和边界条件。结果表明:容错动态性对员工适应性绩效具有显著的正向影响;元认知能力在容错动态性与员工适应性绩效之间发挥中介作用;任务责任心调节容错动态性与元认知能力之间的关系,并进一步调节了容错动态性通过元认知能力对员工适应性绩效起的间接作用。研究从组织情绪视角提出了容错动态性是员工适应性绩效的另一影响因素,为企业提升员工适应性绩效提供新方法。

基于低pH适应性进化策略提高小白链霉菌ε-聚赖氨酸合成能力

小白链霉菌(Streptomyces albulus)是ε-聚赖氨酸(ε-poly-L-lysine,ε-PL)的工业生产菌,其在发酵生产过程中遭受低p H胁迫,易造成ε-PL合成能力下降。因此,该文采用一种逐级增加选择压力的低p H适应性进化策略,经过连续93 d的适应性进化,实现S.albulus GS114耐受p H值由4.0降低到3.6。经过大量筛选,获得了低p H适应性进化菌株S.albulus ALE4.0、S.albulus ALE3.8和S.albulus ALE3.6;结合低p H耐受性和摇瓶发酵实验,确定最优适应性进化菌株为S.albulus ALE3.6。进一步考察不同p H值对S.albulus ALE3.6合成ε-PL的影响发现,S.albulus ALE3.6在不同p H值条件下,较出发菌株S.albulus GS114均表现出发酵优势。最后,采用恒定p H 4.0补料分批发酵方式,在5 L发酵罐水平实现S.albulus ALE3.6的ε-PL产量达到43.7 g/L,较出发菌株提高了63%。研究结果一方面表明通过适应性进化方法可以显著提高S.albulus的低p H耐受能力,另一方面也说明通过增强S.albulus低p H耐受性是提高其合成ε-PL能力的有效途径。

Pig pangenome graph reveals functional features of non‑reference sequences

Background The reliance on a solitary linear reference genome has imposed a significant constraint on our compre-hensive understanding of genetic variation in animals.This constraint is particularly pronounced for non-reference sequences(NRSs),which have not been extensively studied.Results In this study,we constructed a pig pangenome graph using 21 pig assemblies and identified 23,831 NRSs with a total length of 105 Mb.Our findings revealed that NRSs were more prevalent in breeds exhibiting greater genetic divergence from the reference genome.Furthermore,we observed that NRSs were rarely found within coding sequences,while NRS insertions were enriched in immune-related Gene Ontology terms.Notably,our investigation also unveiled a close association between novel genes and the immune capacity of pigs.We observed substantial differences in terms of frequencies of NRSs between Eastern and Western pigs,and the heat-resistant pigs exhibited a substantial number of NRS insertions in an 11.6 Mb interval on chromosome X.Additionally,we discovered a 665 bp insertion in the fourth intron of the TNFRSF19 gene that may be associated with the ability of heat tolerance in South-ern Chinese pigs.Conclusions Our findings demonstrate the potential of a graph genome approach to reveal important functional features of NRSs in pig populations.

虾源罗伊氏黏液乳杆菌的分离鉴定及其性质研究

本试验旨筛选一株防治水产致病菌能力强的虾源乳酸菌,并对其抑制水产致病菌的性质进行研究。以健康南美白对虾的不同肠段菌群为菌株分离来源,采用CaCO 3-MRS固体培养基分离纯化乳酸菌,再通过抑菌能力试验和溶血试验复筛获得安全菌株。对筛选的乳酸菌菌株进行16S rRNA测序鉴定,并评价其生长特性、耐受性、抗生素敏感性及不同处理的发酵上清液对水产病原菌的抑菌能力。结果显示:对常见水产致病菌抑菌能力最强的安全菌株经16S rRNA测序鉴定为罗伊氏黏液乳杆菌SAMMRS-1G。在菌株的生长特性上,罗伊氏黏液乳杆菌SAMMRS-1G的最适培养pH为5.0,最适培养温度为39℃,4~14 h为其对数生长期;从耐受性上看,罗伊氏黏液乳杆菌SAMMRS-1G对人工胃肠液和渗透压均具有一定的耐受性,在pH 3.0条件下静置培养4 h存活率为90.7%,3.0 g/L的胆盐浓度下培养4 h存活率为85.3%,60‰高盐度条件下静置培养4 h存活率为98.7%;在不同处理对罗伊氏黏液乳杆菌SAMMRS-1G发酵上清液抑菌能力影响方面,发酵上清液对致病菌的抑菌能力为创伤弧菌>金黄色葡萄球菌>副溶血弧菌>腐败希瓦氏菌>沙门氏菌>嗜水气单胞>大肠杆菌>假交替单胞菌>溶藻弧菌>霍乱弧菌>哈维弧菌,且发酵上清液具有良好的热稳定性,蛋白酶处理后抑菌能力在原来的82%以上,具有较强的稳定性;小鼠安全性试验表明,罗伊氏黏液乳杆菌SAMMRS-1G对小鼠的生长性能和脏器指数均无负面影响。综上可知,本试验筛选出的虾源罗伊氏黏液乳杆菌SAMMRS-1G是一株耐受性好、防治水产致病菌能力强、代谢产物活性稳定、具有益生菌潜力的安全乳酸菌,可为水产养殖替抗产品的开发提供参考菌种。

母乳嗅觉、味觉刺激联合非营养性吸吮对早产儿喂养耐受性及发育情况的影响

目的:探讨母乳嗅觉、味觉刺激联合非营养性吸吮在早产儿中的应用效果。方法:选取2021年9月—2023年9月莆田市第一医院收治的86例早产儿作为研究对象,按随机数表法分为两组,各43例。对照组采取常规干预,观察组采取母乳嗅觉、味觉刺激联合非营养性吸吮干预。对比两组康复相关指标、喂养耐受情况、吮吸能力及发育情况。结果:观察组每次残留奶量低于对照组,每日排便次数多于对照组,胎粪排尽时间、达全肠道喂养时间、胃管拔除时间、喂养过渡时间、达出生体重时间短于对照组,差异有统计学意义(P<0.05)。观察组喂养不耐受总发生率为4.65%,低于对照组的18.60%,差异有统计学意义(P<0.05)。干预后,观察组喂养效率、吮吸速率高于对照组,差异有统计学意义(P<0.05)。观察组出生14天体重增长、头围增长、身长增长均高于对照组,差异有统计学意义(P<0.05)。结论:母乳嗅觉、味觉刺激联合非营养性吸吮可以缩短早产儿经口喂养时间,改善吮吸能力,减少喂养不耐受,促进身体发育。

依从性曲线的阶段性护理对冠状动脉搭桥术患者术后心功能及运动耐力的影响

目的探讨依从性曲线的阶段性护理对冠状动脉搭桥术患者术后心功能及运动耐力的影响。方法选取2022年1月至2022年12月期间在南阳医学高等专科学校第一附属医院收治的90例冠状动脉搭桥术患者为研究对象,采用随机数字表法随机分成干预组、参照组,各45例。参照组接受常规护理模式,干预组结合依从性曲线的阶段性护理,持续干预6个月。对比两组疾病知识掌握度、锻炼依从性及干预前后生活质量[生活质量评定表(QOL)]、左室舒张末期内径(LVEDD)、成年人健康自我管理能力测评量表(AHSMSRS)、左室射血分数(LVEF)、运动耐力[6 min步行试验(6MWT)]。结果干预组知识掌握率(95.56%)高于参照组(82.22%),差异有统计学意义(P<0.05);干预组锻炼依从率(100.00%)高于参照组(86.67%),差异有统计学意义(P<0.05);干预后,两组LVEF指标明显升高、LVEDD指标明显降低,且干预组LVEF指标明显高于参照组、干预组LVEDD指标明显降低于参照组,差异有统计学意义(P<0.05)。干预后,两组AHSMSRS、QOL评分,6MWT水平均明显升高,且干预组高于参照组,差异有统计学意义(P<0.05)。结论依从性曲线的阶段性护理能进一步提高患者依从性,促进冠状动脉搭桥术患者心功能恢复,提高其生活质量。

甜高粱苗期镉耐性和富集能力综合评价

为筛选和鉴定出镉(Cadmium,Cd)富集能力强的甜高粱(Sorghum bicolor L.)品种,以期为利用甜高粱修复Cd污染土壤提供优异材料。本研究以26个甜高粱品种为材料,采用沙培盆栽试验,设置Cd胁迫(5 mg·kg^(-1)Cd^(2+))和对照(0 mg·kg^(-1))2个处理,测定苗期甜高粱生长特性和生理指标以及根部、茎叶的Cd含量,以各单项指标的耐性指数作为衡量耐Cd性的依据,运用主成分分析、隶属函数法和系统聚类综合评价Cd耐性和富集能力。结果表明:根长、株高、根鲜重、根干重、茎叶鲜重、茎叶干重、叶绿素含量、POD活性、SOD活性、MDA含量在品种和Cd处理间均存在极显著差异(P<0.01)。主成分分析将10个单项指标转化成3个相互独立的综合指标,利用隶属函数法分析,得到不同品种苗期耐Cd性综合评价值(D值);通过对D值进行聚类分析,筛选出3份耐Cd性强的品种;进一步采用欧氏距离法对D值、富集系数和转移系数进行聚类分析,将26个甜高粱品种划分成4类,其中‘辽甜6号’和‘F10’属于Cd耐性强且富集转移性强的品种,适用于修复土壤Cd污染。

潮州地区慢性阻塞性肺疾病的慢病管理

目的探讨慢性阻塞性肺疾病(chronic obstructive pulmonary disease,COPD)慢病管理(chronic disease management,CDM)在潮州地区的应用。方法将2020年04月—2021年04月收治的120例住院COPD患者按照随机数字表法分为2组,每组60例,对照组予以常规管理,观察组予以慢病管理。比较2组干预前后自我管理能力、对疾病认知程度、运动耐力、治疗依从性以及生活质量。结果观察组管理3个月、6个月、12个月后自我管理量表评分高于对照组(P<0.05);观察组管理3个月、6个月、12个月后慢性阻塞性肺疾病知识问卷(COPD—Q)评分高于对照组(P<0.05);观察组管理后3个月、6个月、12个月后6 min步行距离(6MWD)大于对照组(P<0.05);慢病管理12个月后观察组治疗依从性较对照组高(P<0.05);观察组管理后3个月、6个月、12个月后COPD生存质量评分低于对照组(P<0.05)。结论慢病管理可以帮助COPD患者提高院外自我管理能力与治疗依从性,提升疾病认知程度以及运动耐力,改善患者生活质量。

一品红对重金属锌胁迫的耐受性及其富集能力

【目的】通过观察一品红(Euphorbia pulcherrima Willd.)在不同水平锌(Zn)胁迫下的生长生理变化,探讨一品红应用于植物修复重金属污染土地的潜力,为Zn污染土壤的治理提供新思路。【方法】以一品红扦插苗为试验材料,采用不完全随机区组设计进行盆栽试验,设置6种土壤Zn污染浓度处理:0 mg/kg(CK,不添加Zn试剂)、T1(200 mg/kg)、T2(300 mg/kg)、T3(500 mg/kg)、T4(800 mg/kg)和T5(1000 mg/kg)(干重),4次重复。试验期间每隔14 d测量1次株高、地径;第112天采样测定一品红的生物量、根系形态指标(根长、总投影面积、根表面积、平均直径、根体积和根尖数)、叶片数、叶面积、叶绿素含量、丙二醛(MDA)含量以及Zn富集含量,计算耐性系数(TI)和转运系数(TF)。【结果】①与对照组相比,不同浓度Zn处理的一品红株高增量、地径增量、生物量、根体积、叶片数、叶面积、叶绿素含量受到不同程度的抑制,但均未观察到明显的重金属毒害症状。②一品红对Zn的抗逆性较强,表现在:TI均大于50%,随土壤Zn污染浓度的增加呈现“低促高抑”现象;MDA含量在高锌浓度下增加;叶片相对电导率变化不显著。③一品红植株体内不同部位的锌含量都与土壤Zn浓度呈正相关关系,不同组织对Zn的吸收能力为根>叶>茎。在所有Zn处理下,一品红地上部分Zn含量显著高于根部,除T1处理的TF为0.96外,其他处理的TF>1,适合用于植物提取。【结论】一品红对Zn具有一定的耐受性,在土壤Zn浓度为1000 mg/kg时的Zn富集性和地上部分Zn迁移能力较强。同时作为观赏植物,一品红在重金属污染区进行植物修复还可以绿化美化环境。

茶树铝吸收和铝耐受研究进展

茶树(Camellia sinensis(L.)O.Kuntze)生长在热带和亚热带地区酸性(pH 4.0~5.5)土壤中,与大多数作物不同,它能够在高铝(Al)含量的土壤中存活,而且生长过程中需要吸收Al元素,因此被认为是一种能够超富集Al的植物。文章对茶树根部的Al吸收、Al在茎中的运输及叶片的贮存等相关过程进行了全面综述,同时分析了不同部位和细胞组成在Al富集方面的特性及茶树的多种Al耐受机制,并对未来的研究方向进行了展望,旨在为茶叶产业的可持续发展提供重要的理论依据和实践指引。

转录调节蛋白TP53基因敲除增加斑马鱼耐寒能力与运动行为的研究

转录调节蛋白TP 53(Tumor protein 53)调控多种重要生物学过程,包括细胞周期、DNA损伤、修复和细胞凋亡等.在各种应激条件下tp53会被激活并发挥与应激相关的调控作用,但tp53在鱼类低温应激下的作用尚不明了.本文首先检测在低温应激条件下斑马鱼(Danio rerio)中tp53的表达变化,然后利用tp53^(-/-)斑马鱼敲除模型研究了敲除tp53对斑马鱼低温耐受能力和运动的影响.RT-qPCR结果显示:在8℃低温条件下野生型斑马鱼全鱼和鳃组织中tp53的mRNA水平显著升高.低温耐受实验显示:8℃低温下tp53^(-/-)斑马鱼的耐受能力增强,半数致死时间(lethal time to 50%mortality, LT50)显著高于WT(Wild type)对照组(P<0.000 1).运动行为学实验发现:与28℃相比,18℃低温下WT和tp53^(-/-)斑马鱼的移动距离、平均速度和活跃度均显著降低(P<0.000 1);同时发现在28℃和18℃条件下,tp53^(-/-)斑马鱼的移动距离、平均速度和活跃度均显著高于WT组.研究结果说明tp53参与斑马鱼的低温响应过程,敲除tp53后斑马鱼的耐寒能力与运动能力增强.本文为鱼类的低温耐受机制和运动行为学研究提供了新思路.

利用低聚半乳糖双歧杆菌的筛选及益生特性研究

短链低聚半乳糖(SC-GOS)是双歧杆菌的有效增殖因子。本试验从婴儿粪便样品中筛选得到7株高效利用SC-GOS的双歧杆菌,经16S r DNA鉴定,它们为1株为长双歧杆菌婴儿亚种BI_Y46,2株为两歧双歧杆菌(BB_Y22、BB_S7),2株假小链双歧杆菌(BP_Y43、BP_YA)以及2株长双歧杆菌(BL_S34、BL_H26)。以婴儿双歧杆菌M63和婴儿双歧杆菌ATCC15697为对照,观察菌株形态并分析益生特性,初步筛选出具有应用潜力的益生菌株。结果表明,BI_Y46形态特殊,分叉状有菌毛;BB_Y22、BP_Y43的胞外多糖产量超过0.45 mg/mL;BL_H26菌体表面蛋白含量较高,为0.74 mg/mL,BB_Y22、BB_S7含量在0.35~0.45 mg/mL范围;同时BP_Y43、BB_Y22具有较强的表面疏水性和自聚集能力;在模拟胃液中及胆盐存在下,BB_Y22、BI_Y46对胆盐和胃液的刺激显示出较强的耐受性。抑菌试验显示BI_Y46、BB_S7上清液对大肠杆菌ATCC 25922的抑菌效果较强。结论:长双歧杆菌婴儿亚种BI_Y46、两歧双歧杆菌BB_Y22以及假小链双歧杆菌BP_Y43具有较好的益生潜力,为开发含有低聚半乳糖和双歧杆菌的产品提供一定参考。

一株耐盐菌GL的分离鉴定及促生特性分析

利用海底的淤泥进行分离挑选得到一株耐盐性较强的菌株,该菌为细长的棒状且菌体较长,菌落发白,用接种针易刮起,发出微臭气息.经过16S rRNA序列比对,该菌株与嗜热脂肪土芽孢杆菌菌株GL(KX254601.1)之间关系可信度达到100%,故将其定名为嗜热脂肪土芽孢杆菌(GL).经过对该菌株在1%~10%盐浓度下生长曲线分析,3%~6%的NaCl浓度内菌株最高OD 600能达到1.5,但是当盐浓度达到10%时菌株生长受到严重影响.菌株GL在1%~9%盐浓度下长势良好,其最佳生长盐浓度为2%.对该菌种的固氮、产铁载体以及促进种子萌发能力进行分析,可以看到在0~2.5%盐浓度下,Ashby无氮培养基上菌落周围均有透明圈,说明该菌株在0~2.50%的盐浓度下具有较好的固氮能力.菌株在0~150 mmol/L的盐浓度下可以产生铁载体,能够促进小白菜种子在盐胁迫条件下萌发和生长,说明该菌株在盐胁迫条件下具有较好的促生特性.

针对音变问题改进的维汉神经网络机器翻译鲁棒性方法研究

由于维吾尔语具有音变差异,在记录时容易混淆,这对机器翻译的容错能力提出了挑战。从词粒度研究的角度出发,针对维吾尔语中具有明显语音特性的音变词的翻译问题,采用字符级神经网络机器翻译(Character level Neural Network Machine Translation,CharNMT)结构,并结合覆盖率机制进行优化,这一方法不仅提高了音变词的翻译质量,还展现出较好的容错能力。在基础模型取得了1.25 Blue分的提升,并在训练和解码速度方面也具有优势。

铅卤钙钛矿泄漏对垂穗披碱草幼苗生长的影响

本研究通过模拟铅卤钙钛矿泄漏导致的不同铅(Pb)胁迫梯度(0,36,72,130,170和260 mg·kg^(-1)),监测高寒草甸优质牧草垂穗披碱草幼苗生长情况,重点分析Pb胁迫对垂穗披碱草幼苗Pb富集能力和耐受能力的影响。结果表明:1)垂穗披碱草的出苗率并未受到Pb胁迫梯度的显著影响,但出苗速率和出苗持续时间随Pb胁迫增加而显著降低;2)Pb胁迫显著抑制垂穗披碱草幼苗高度,但单株幼苗生物量则表现为浓度效应,小于72 mg·kg^(-1) Pb浓度作用不显著,大于72 mg·kg^(-1)时表现为抑制作用,在260 mg·kg^(-1)时无法萌发;3)垂穗披碱草幼苗的Pb富集能力显著降低,Pb耐受范围为68.42~205.94 mg·kg^(-1);4)结构方程模型表明,铅卤钙钛矿泄漏导致的Pb胁迫通过降低土壤pH和增加硝态氮含量改变垂穗披碱草幼苗生长情况,进而影响其Pb富集能力和耐受范围。土壤pH值和硝态氮含量是影响垂穗披碱草幼苗生长的重要因子,在铅卤钙钛矿泄漏情境下可以通过提高土壤pH增加其Pb耐受能力。