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1.
摘要:本文研究大穗大粒小麦籽粒灌浆干物质积累模型及灌浆特性与粒重的相关分析。结果表明:小麦籽粒干重变化呈“S”曲线,灌浆速率和籽粒水分含量均呈正态曲线。最大灌浆速率Rmax,渐增期(R1)快增期(R2)和缓增期速率(R3),渐增期持续天数(T1)是影响粒重的重要参数,各阶段灌浆速率与持续时间呈显著负相关。因此在大穗大粒高产小麦栽培和育种中可通过选育高灌浆速率,尤其是高快增期灌浆速率的品种;通过适当的栽培措施协调灌浆速率与持续时间的矛盾,增加缓增期灌浆速率而提高粒重  相似文献   

2.
温光敏两系杂交小麦灌浆特性研究   总被引:1,自引:0,他引:1  
对温光敏两系杂交小麦籽粒灌浆干物质积累模型及灌浆特性与粒重的相关性进行了分析,结果表明:温光敏两系杂交小麦籽粒干重变化呈"S"曲线,整个灌浆过程中,杂交小麦的干物质增幅都比常规小麦高,且达到快速增长的时间要早。杂交小麦的灌浆速率和籽粒水分含量均呈正态曲线,其灌浆速率比同期常规小麦高。最大灌浆速率Rmax,快增期(R2)和缓增期速率(R3),渐增期持续天数(T1)是影响粒重的重要参数。因此提高渐增期和快增期速率对提高小麦粒重尤为重要。  相似文献   

3.
夏玉米籽粒灌浆特性及其与粒重的相关性分析   总被引:1,自引:0,他引:1  
以登海605和登海618为材料,分析了不同处理夏玉米籽粒灌浆特性及灌浆参数与粒重的相关性。结果表明:夏玉米籽粒干物质积累呈Logistic曲线的变化趋势;籽粒灌浆呈现先增大后减小的变化趋势,可分为渐增期、快增期和缓增期3个阶段;提高平均灌浆速率R、渐增期灌浆速率R1、灌浆快增期灌浆持续时间T2和缓增期灌浆持续时间T3等灌浆参数指标,对于提高夏玉米成熟期粒重具有重要的作用;籽粒最大灌浆速率出现的时间主要受渐增期持续时间影响;灌浆期最大灌浆速率Rmax与快增期籽粒灌浆速率R2和缓增期灌浆速率R3呈极显著正相关。  相似文献   

4.
小麦籽粒灌浆特性研究   总被引:11,自引:1,他引:11  
根据 1998~ 2 0 0 0年对不同小麦品种灌浆特性的观察 ,利用logistic方程拟合其籽粒灌浆过程 ,并推导出一系列次级灌浆参数。用通径分析逐步回归等统计方法分析了不同灌浆参数与粒重的关系。结果表明 ,籽粒灌浆速率和灌浆期持续天数是影响鲁中南高产小麦粒重的 2个重要因素 ,灌浆速率的作用更大。进一步分析表明 ,灌浆快增期灌浆速率、持续天数和渐增期灌浆速率密切相关。因此 ,提高渐增期灌浆速率对增加粒重尤为重要  相似文献   

5.
不同熟期小麦籽粒灌浆特性的研究   总被引:4,自引:0,他引:4  
为了解河西地区不同熟期类型小麦品种籽粒灌浆特性及其对粒质量的影响,对6个不同熟期类型(早、中、晚)春小麦品种的籽粒灌浆特性进行了比较研究.用logistic方程拟合籽粒灌浆过程,并推导出了次级参数,同时对粒质量与不同参数进行了相关和回归分析.结果表明:晚熟品种平均灌浆速率(R)高、灌浆期(T)较长、灌浆高峰灌浆强度大且持续时间长,缓增期灌浆速率(R3)急剧下降.早熟品种灌浆期短,灌浆高峰灌浆强度小、持续时间短,缓增期灌浆速率高于中、晚熟品种.回归分析结果表明:从整个灌浆过程来看,平均灌浆速率对粒质量的影响大于整个灌浆持续时间.从阶段灌浆参数分析来看,渐增期灌浆速率(R1)、快增期灌浆速率(R2)和缓增期灌浆持续时间(T3)是影响河西地区不同熟期春小麦粒质量的主要参数,其中快增期灌浆速率对粒质量的作用更大一些.  相似文献   

6.
小麦籽粒灌浆参数与粒重的相关及通径分析   总被引:5,自引:1,他引:5  
选择新春8号等6个春小麦品种,用Richards方程对籽粒灌浆过程进行拟合,通过T测验、相关分析及通径分析等方法对籽粒灌浆参数分析探讨.结果表明,灌浆各阶段不同灌浆参数间存在显著差异.从灌浆时间来看,灌浆持续时间T1和T3变异系数较大,Tmax.R、T、D和T2则相对稳定;从灌浆速率看,Rmax.R、R、R2变异系数小,比较稳定;R1和R3的变异系数较大,易受环境影响.渐增期灌浆速率R1与千粒重呈极显著负相关;快增期持续天数T2、缓增期灌浆速率R3、灌浆活跃期D与千粒重呈极显著正相关.灌浆参数对千粒重的直接通径系数大小依次为灌浆活跃生长期>最大灌浆速率Rmax.R>缓增期灌浆速率R3>渐增期灌浆速率R1>快增期持续天数T2>快增期灌浆速率R2,延长灌浆活跃期对稳定和提高千粒重具有重要意义.  相似文献   

7.
干旱胁迫下冬小麦灌浆特性分析   总被引:2,自引:0,他引:2  
在干旱胁迫条件下 ,以豫西地区种植的 6个主要小麦品种为试验材料 ,用Logistic方程对籽粒灌浆过程拟合 ,并推导出一系列次级参数 ,用相关与逐步回归等分析方法对不同灌浆参数与粒重关系进行分析。结果表明 ,干旱条件下籽粒灌浆速率对小麦粒重形成作用显著 ,而灌浆持续时间与粒重形成无显著相关关系 ,特别是提高渐增期和快增期灌浆速率对提高粒重尤为重要  相似文献   

8.
以目前河南省生产上大面积推广的高肥小麦品种和洛阳农科院新培育的小麦品种为材料,研究不同习性小麦籽粒灌浆的特性及其灌浆特性比较。用Logisitic方程对不同习性小麦品种的籽粒灌浆过程进行了拟合;用变异系数法分析了灌浆各参数的变异大小,用相关分析研究了灌浆参数与粒重的关系。结果表明:(1)对所有品种来说,T3,R3的变异系数较大,其次是R1和R,Tmax和T品种间差异小,相对稳定;对春性品种来说,品种间变异较大的是T3和R3,相对稳定的是Tmax和T;相对于半冬性品种,T3和R3的变异大,其次是R1和T1,T和Rmax的变异小。(2)对所有品种来说最大灌浆达到时间Tmax、最大灌浆速率Rmax、平均灌浆速率R和各阶段灌浆速率是影响粒重的主要因素,而且R对粒重的影响达极显著水平;而对春性品种,与粒重显著相关的灌浆参数为Rmax、R、R2;半冬性品种,平均灌浆速率R、R1和T2与粒重显著相关。针对河南省小麦灌浆后期常有干热风的气候特征,通过栽培措施协调不同习性小麦品种灌浆速率与持续时间的矛盾,选育平均灌浆速率较高的高肥小麦品种,从而达到增加粒重、获得高产的目的。  相似文献   

9.
不同熟期小麦品种籽粒灌浆参数与粒重相关性研究   总被引:7,自引:0,他引:7  
以河北省近年生产种植的3个不同熟期类型(早、中、晚)冬小麦品种为试验材料,用Logistic方程对籽粒灌浆过程进行拟合,通过T测验以相关等方法对籽粒灌浆特性进行分析探讨,结果表明,早熟品种籽粒的平均灌浆速率(R),灌浆持续时间(T),灌浆强度和灌浆程度,不同程度的等于或高于中熟品种和晚熟品种:在灌浆各阶段不同期类型的部分灌浆参数间有显著差异,T值,R值,快增期灌浆速率R2和时间T2、缓增期灌浆速率R3和时间T3对粒重(y)作用显著,从育种角度考虑,北方冬麦区增加粒重以提高R而不加长T好。  相似文献   

10.
播种期对周麦18号籽粒灌浆特性及产量构成的影响   总被引:2,自引:0,他引:2  
2007~2008年度对不同播种期条件下的周麦18号籽粒灌浆特性及产量性状进行了研究。结果表明,播种期对周麦18号籽粒灌浆和粒重有显著影响,籽粒灌浆持续期T、最大灌浆速率出现时间Tmax、渐增期持续时间T1、缓增期持续时间T3均随着播种期推迟而降低;最大灌浆速率Rmax、平均灌浆速率R和快増期持续时间T2、快増期灌浆速率R2、缓增期灌浆速率R3则随着播种期推迟而先升高后降低。进一步的研究表明,影响周麦18号粒重的灌浆参数主要是平均灌浆速率R和最大灌浆速率Rmax,此外,不同阶段的灌浆速率和灌浆持续时间对粒重也有较大影响。通过对产量构成因素的影响分析,本试验条件下,于10月12~17日播种,有利于产量构成因素协调发展,获得较高产量。  相似文献   

11.
Wheat grain yield is generally sink-limited during grain filling. The grain-filling rate (GFR) plays a vital role but is poorly studied due to the difficulty of phenotype surveys. This study explored the grain-filling traits in a recombinant inbred population and wheat collection using two highly saturated genetic maps for linkage analysis and genome-wide association study (GWAS). Seventeen stable additive quantitative trait loci (QTLs) were identified on chromosomes 1B, 4B, and 5A. The linkage interval between IWB19555 and IWB56078 showed pleiotropic effects on GFR1, GFRmax, kernel length (KL), kernel width (KW), kernel thickness (KT), and thousand kernel weight (TKW), with the phenotypic variation explained (PVE) ranging from 13.38% (KW) to 33.69% (TKW). 198 significant marker-trait associations (MTAs) were distributed across most chromosomes except for 3D and 4D. The major associated sites for GFR included IWB44469 (11.27%), IWB8156 (12.56%) and IWB24812 (14.46%). Linkage analysis suggested that IWB35850, identified through GWAS, was located in approximately the same region as QGFRmax2B.3-11, where two high-confidence candidate genes were present. Two important grain weight (GW)-related QTLs colocalized with grain-filling QTLs. The findings contribute to understanding the genetic architecture of the GFR and provide a basic approach to predict candidate genes for grain yield trait QTLs.  相似文献   

12.
不同棱型大麦材料灌浆特性分析   总被引:3,自引:0,他引:3  
以10个大麦品种(品系)为材料,用Logistic曲线方程对其灌浆过程进行拟合.结果表明:不同棱型大麦灌浆参数不同,二棱大麦的灌浆平均速率(R),灌浆渐增期速率(R1),最大灌浆速率(Rmax),理论最大粒质量(K)和千粒质量显著大于四棱大麦.二棱大麦千粒质量与灌浆平均速率(R)和灌浆渐增期速率(R1)呈显著正相关.四棱大麦千粒质量与灌浆缓增期速率(R3)呈极显著正相关,与灌浆最大速率(Rmax)、灌浆快增期速率(R2)和灌浆最大速率出现时间(Tmax)呈显著正相关.  相似文献   

13.
灌溉方式对寒地水稻产量及籽粒灌浆的影响   总被引:3,自引:1,他引:2  
【目的】研究不同灌溉方式对寒地水稻茎蘖动态、干物质积累和籽粒灌浆特征的影响,以深化灌溉方式对籽粒灌浆过程调控的认识,为指导水稻高产、高效栽培提供依据。【方法】试验以空育131和垦稻24为试验材料,在大田设置重干湿交替灌溉(W1)、轻干湿交替灌溉(W2)和浅水灌溉(W3)3 种灌溉处理,分析灌溉处理对寒地水稻产量形成和籽粒灌浆特性的影响。【结果】不同灌溉方式对寒地水稻茎蘖数、成穗率、干物质积累量、抽穗后茎鞘干物质转运、籽粒灌浆、产量及其构成的影响均存在显著差异,W2和W1处理能够有效控制无效分蘖,增加结实率,降低植株高度和缩短倒3、4节间长度,其中W2处理下成穗率提高,干物质积累及转运能力增强,且千粒重也有明显增加。从灌浆特性上看,灌溉方式下空育131和垦稻24籽粒鲜重增加与花后天数呈二次曲线关系,模拟效果以垦稻24表现最佳,最大籽粒鲜重(Ymax)均以W2处理最大;W2处理下籽粒灌浆速率大且呈单峰曲线变化,前期生长迅速,到达最大灌浆速率时间早;籽粒干重增重可用Richards方程对籽粒灌浆过程进行分析,相关系数在0.9940-0.9995,品种间籽粒灌浆中达到最大生长速率的时间(Tmax),最大生长速率(Gmax)以及平均生长速率(Gmean)均表现为垦稻24>空育131。在产量方面,2012年W2处理下2个品种产量较W1处理增加13.91%-28.26%,较W3处理产量增加5.31-9.95%;2013年较W1处理产量增加22.05%-25.67%,较W3处理产量增加5.15-7.70%。因此,轻干湿交替灌溉方式的增产途径是农艺性状配置合理,抽穗后干物质积累能力强及所占比例高,茎鞘干物质转运能力强,形成较高的群体素质;籽粒灌浆中最终生长量(A)和起始生长势(R0)增加,Tmax值缩短,Gmax值和Gmean值提高;对二次枝梗作用效果大于一次枝梗,其中3粒二次枝梗粒数和产量明显增加,收获指数、千粒重和结实率高,最终籽粒产量高。【结论】灌溉方式对寒地水稻产量形成和籽粒灌浆过程的调控产生较大影响,从增产角度上看,目前轻干湿交替灌溉方式更适合在寒地水稻高产、高效栽培中应用,而重干湿交替和浅水灌溉不利于寒地水稻产量的增加。  相似文献   

14.
不同熟期春玉米品种的籽粒灌浆特性   总被引:20,自引:2,他引:20  
【目的】明确目前东北地区主推不同熟期春玉米品种粒重形成过程的籽粒灌浆特性,为玉米籽粒发育调控和熟期选择提供理论依据。【方法】选用东北区40个不同熟期的高产春玉米品种。在同一环境条件下,采用60 000株/hm2大田种植。调查各品种出苗至成熟的生育天数,依据生育期对不同品种的熟期进行分类,研究不同熟期品种产量和百粒重的差异;运用Logistic模型解析不同熟期品种的籽粒灌浆过程,分析积累起始势、灌浆速率、灌浆时间等籽粒灌浆参数及其与产量相关性。【结果】依据联合国粮农组织标准,东北地区目前主推的玉米高产品种按生育期长短可分为中熟(I)、中晚熟(II)、晚熟(III)和超晚熟(IV)4类,其中晚熟品种最多(50%),生育期121-130 d,其次为超晚熟品种(25%),生育期131-140 d,中熟品种和中晚熟品种最少(均为12.5%),生育期分别为101-110 d和111-120 d。60 000株/hm2试验密度下,4个类型品种以晚熟品种产量最高,超晚熟品种次之,中熟品种产量最低;中熟品种产量比晚熟、超晚熟和中晚熟品种分别低45%、44%和35%。中晚熟、晚熟和超晚熟品种产量无显著差异(P>0.05),但显著高于中熟品种(P<0.05)。灌浆初期,中熟品种百粒重最低,超晚熟品种百粒重最高,灌浆30 d后,中晚熟品种百粒重增长速度最快,中熟品种百粒重增长速度最慢。4类熟期品种籽粒灌浆速率均呈单峰曲线变化,中熟品种的灌浆峰值最高,超晚熟品种最低。各品种达到灌浆峰值后,超晚熟品种灌浆速率下降最慢,中熟品种下降最快。运用Logistic方程可较好地拟合籽粒灌浆过程(R>0.99),将各熟期品种灌浆过程划分为渐增期、快增期和缓增期,中熟品种籽粒灌浆参数中积累起始势(R0)、最大灌浆速率(Rmax)、渐增期持续时间(T1)、快增期和缓增期灌浆速率(v2, v3)明显高于其他熟期类型品种,其灌浆活跃期(P)、快增期和缓增期持续时间(T2, T3)及渐增期灌浆速率(v1)则明显低于其它熟期类型品种。相关分析表明,不同熟期品种产量与灌浆活跃期、有效灌浆时间(t3)、渐增期灌浆速率、快增期和缓增期持续时间极显著正相关;与积累起始势、最大灌浆速率、渐增期持续时间、快增期和缓增期灌浆速率极显著负相关。【结论】中熟品种灌浆启动快,灌浆活跃期和有效灌浆时间短,中晚熟、晚熟和超晚熟品种灌浆启动慢,灌浆活跃期和有效灌浆时间长;在保证籽粒安全成熟前提下,延长灌浆活跃期、有效灌浆时间、快增期和缓增期持续时间,提高渐增期灌浆速率,有利于提高不同熟期玉米产量。  相似文献   

15.
Compared with single agronomic practices management during grain formation, knowledge about integrated agronomic practices management on grain-filling characteristics and physiological function of endogenous hormones was limited. In order to clarify this issue, two field experiments, integrated agronomic practices management(IAPM), T1(local conventional cultivation practices), T2(an optimized combination of cropping systems and fertilizer treatment), T3(treatment based on high-yield studies), and T4(further optimized combination of cropping systems and fertilizer treatment), and nitrogen rate testing(NAT)(four nitrogen rates, 0, 129.0, 184.5, and 300.0 kg N ha–1) were performed with summer maize hybrid Zhengdan 958(ZD958). Results showed that with increased nitrogen rate, the endogenous hormone balance was promoted and the grain-filling characteristics were improved sufficiently to resulting in a significant increase in grain yield. However, the grain-filling characteristics deteriorated and yield was reduced with excessive nitrogen fertilization. However, IAPM could promote hormone balance and improve grain filling characteristic. The indole-3-acetic acid(IAA), zeatin riboside(ZR), and gibberellin(GA3) contents under T2 and T4 treatments were higher and the abscisic acid(ABA) content was lower, and the ZR and GA3 contents under T3 were higher than those under T1. Those resulted in the maximum grain-filling rate(Wmax) and the active grain-filling period(P) under T2, T3 and T4 were significantly increased than those under T1, and hence promoted kernel weight and grain yield. So IAPM promoted hormone balance by improving tillage model, optimizing fertilizer rate and fertilization period, appropriately increasing planting density and delaying harvest, which promoted grain filling rate and lengthened active grain-filling period, finally increased grain yield.  相似文献   

16.
There is limited information about the combined effect of shading time and nitrogen(N) on grain filling and quality of rice. Therefore, two japonica super rice cultivars, Nanjing 44 and Ningjing 3, were used to study the effect of shading time and N level on the characteristics of rice panicle and grain filling as well as the corresponding yield and quality. At a low N level(150 kg N ha~(–1), 150 N), grain yield decreased(by 21.07–26.07%) under the treatment of 20 days of shading before heading(BH) compared with the no shading(NS) treatment. These decreases occurred because of shortened panicle length, decreased number of primary and secondary branches, as well as the grain number and weight per panicle. At 150 N, in the treatment of 20 days of shading after heading(AH), grain yield also decreased(by 9.46–10.60%) due to the lower grain weight per panicle. The interaction of shading and N level had a significant effect on the number of primary and secondary branches. A high level of N(300 kg N ha~(–1), 300 N) could offset the negative effect of shading on the number of secondary branches and grain weight per panicle, and consequently increased the grain yield in both shading treatments. In superior grains, compared with 150 N NS, the time to reach 99% of the grain weight(T_(99)) was shortened by 1.6 to 1.7 days, and the grain weight was decreased by 4.18–5.91% in 150 N BH. In 150 N AH, the grain weight was 13.39–13.92% lower than that in 150 N NS due to the slow mean and the maximum grain-filling rate(GR_(mean )and GR_(max)). In inferior grains, grain weight and GR_(mean) had a tendency of 150 N NS150 N BH150 N AH. Under shaded conditions, 300 N decreased the grain weight due to lower GR_(mean) both in superior and inferior grains. Compared with 150 N NS, the milling and appearance qualities as well as eating and cooking quality were all decreased in 150 N BH and 150 N AH. Shading with the high level of 300 N improved the milling quality and decreased the number of chalky rice kernels, but the eating and cooking quality was reduced with increased chalky area and overall chalkiness. Therefore, in the case of short term shading, appropriate N fertilizer could be used to improve the yield and milling quality of rice, but limited application of N fertilizer is recommended to achieve good eating and cooking quality of rice.  相似文献   

17.
以七个籽粒大小不同的玉米杂交种为材料,在三个播期中评价籽粒生长性状的稳定性。结果表明,终结体积的基因型与播期互作不显著,其余性状均存在显著的基因型与播期互作。对于最大鲜体积、终结体积和粒重,只有基因型与播期互作中的线性部分显著。多数大粒型组合的终结体积、最大鲜体积、粒重和有效灌浆期表现较稳定。大粒型杂交种多数性状比小粒型具有较大的均数和回归系数,粒重的稳定性参数与终结体积、有效灌浆期和实际灌浆期的稳定性参数存在一定相关。  相似文献   

18.
去苞叶对夏玉米籽粒灌浆特性和产量的影响   总被引:7,自引:0,他引:7  
【目的】在大田试验条件下,设置不同去苞叶处理,研究去苞叶后夏玉米产量、籽粒体积、干重、脱水速率、籽粒灌浆速率以及籽粒黑层出现和乳线消失所需时间的变化,以期明确去苞叶对夏玉米籽粒产量和籽粒灌浆特性的作用。【方法】以先玉335(XY335)、郑单958(ZD958)和登海661(DH661)为试验材料,设置不同去苞叶处理:去苞叶1/4(S1)、去苞叶1/2(S2)和苞叶全去(S3)以及对照(CK),研究去苞叶对夏玉米产量、籽粒灌浆特性以及籽粒黑层出现和乳线消失所需时间的影响等。【结果】去苞叶后夏玉米产量显著下降,XY335的S1、S2和S3处理的产量较CK分别下降9.45%、13.78%和27.89%,ZD958分别下降10.72%、15.07%和24.75%,DH661分别下降9.31%、16.01%和22.35%,去苞叶数越多,产量下降幅度越大。去苞叶后夏玉米的千粒重和穗粒数等产量构成因素显著下降,S3处理影响最显著,XY335的S3处理千粒重和穗粒数分别下降15.30%和14.87%,ZD958分别下降11.22%和15.24%,DH661分别下降15.10% 和8.55%。此外,去苞叶显著影响夏玉米的籽粒灌浆特性,影响随去苞叶数的增多而显著加剧。去苞叶后籽粒到达最大灌浆速率时的天数(Dmax)显著减少,S3处理影响最显著,XY335、ZD958和DH661的S3处理的Dmax较CK分别缩短3 d、4 d和3.5 d。去苞叶后灌浆速率最大时的生长量(Wmax)和籽粒灌浆活跃期(P)等也均显著降低,且去苞叶数目越多,Wmax和P的下降幅度越大,XY335﹑DH661和ZD958的S3处理的Wmax较CK分别下降12.75%、17.78% 和17.12%。XY335﹑DH661和ZD958的S1﹑S2、S3的P较CK分别下降6.22%、9.82%和11.78%,5.39%、8.39%和13.09%,0.17%、2.39%和5.97%。去苞叶后籽粒鲜重和籽粒体积显著下降,籽粒脱水速率显著提高,灌浆时间减少,籽粒乳线消失时间和籽粒黑层出现时间较正常发育的籽粒缩短,S3处理影响最显著,XY335﹑ZD958和 DH661的S3处理的籽粒乳线消失所需时间较CK分别缩短10 d、6 d和4 d,籽粒黑层出现所需时间较CK分别缩短10 d、5 d 和4 d。【结论】去苞叶后灌浆速率最大时的生长量、达最大灌浆速率时的天数和籽粒灌浆活跃期均显著降低,籽粒脱水速率显著提高,导致籽粒灌浆时间缩短,籽粒干物质积累量显著下降,籽粒乳线消失和黑层出现的时间较正常发育籽粒缩短,进而严重影响夏玉米籽粒的正常灌浆,最终导致夏玉米产量显著下降,且其影响程度随去苞叶数目的增加而加剧。  相似文献   

19.
The objectives of this study were to investigate ethylene and 1-aminocylopropane-1-carboxylic acid (ACC) in rice grains and root bleeding sap during the grain filling period and their relationship to the grain filling rate. Two high lodging-resistant rice (Oryza sativa L.) cultivars were grown in pots or tanks. Three treatments, including well watered (WW), moderate soil-drying (MD) and severe soil-drying (SD), were conducted from 9 days of post-anthesis until maturity. The effects of chemical regulators on the concentrations of ethylene and ACC in the grains were also studied. The results show that MD significantly increased the grainfilling rate and grain weight, whereas SD significantly reduced the grain-filling rate and grain weight. Concentrations of ethylene and ACC in the grains were very high at the early grain filling stage and then sharply decreased during the linear period of grain growth. MD reduced the ACC concentrations and ethylene evolution rate, whereas SD remarkably increased the ACC concentrations and ethylene evolution rate. Both the ethylene evolution rate in rice grains and the ACC concentrations in the root-bleeding sap were significantly and positively correlated with the ACC concentrations in rice grains. The ethylene evolution rate was significantly and negatively correlated with the grain-filling rate. The application of amino-ethoxyvinylglycine (AVG), an inhibitor of ethylene synthesis, at 9–13 days of postanthesis significantly reduced the ACC concentrations and ethylene evolution rate of grains, but significantly enhanced the activities of sucrose synthase, ADP glucose pyrophosphorylase and soluble starch synthase. The results were reversed when ethephon, an ethylenereleasing agent, was applied. The results suggest that moderate soil drying during the grain-filling period in rice could inhibit the production of ethylene and ACC and therefore accelerate grain filling and increase grain weight. __________ Translated from Acta Agronomica Sinica, 2007, 33(4): 539–546 [译自: 作物学报]  相似文献   

20.
为探究内源激素含量对燕麦灌浆过程的影响,分别于2020和2021年,以9个不同基因型的燕麦品种为试验材料,设置大田试验,测定灌浆粒重、灌浆期光合特性、旗叶碳代谢酶(蔗糖磷酸合成酶SPS、蔗糖合酶SS)活性、生长素(IAA)、赤霉素(GA3)、玉米素核苷(ZR)、脱落酸(ABA)含量及成熟期粒重,通过方差分析和聚类分析,探究不同基因型燕麦灌浆期生理特性、内源激素差异。结果表明:不同品种间,内源激素含量及其他生理特性差异均达显著水平(P<0.05),按照灌浆粒重,将供试的9个品种分为灌浆较强和较弱两类,其中灌浆较强品种到达灌浆盛期的时间较早,灌浆启动时间也早于其他品种;灌浆粒重拟合程度较好,灌浆过程中的净光合速率、碳代谢酶活性较高,粒重优于其他品种;灌浆较强品种单穗粒重较灌浆较弱品种高11.8%~176.5%;灌浆较强品种旗叶IAA、GA3、ZR含量较灌浆较弱品种高12.6%~118.2%、7.2%~98.0%、21.4%~72.2%,(GA3+ZR+IAA)/ABA较灌浆较弱品种高39.3%~311.9%。在各内源激...  相似文献   

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