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不同播期和品种小麦小花结实的粒位差异 总被引:7,自引:0,他引:7
确定小麦不同小穗位和小花位发育与结实特性是实现大穗多粒的重要前提,本文通过对冬,春性小麦品种分期播种试验得出,较高的小穗结实力是增加穗粒数的重要因素,不同播期,品种之间,小穗粒重和粒数呈现相同的变化趋势,中部以及基部小穗粒重与穗粒重之间呈高度正相关,体现环境差异的播期效应以对中部小穗发育的影响为主,而冬,春性品种的基因型差异可反映在各个小穗位上,第2小花粒的子粒发育状况反映整个小穗的生产能力,结果表明,促进中部优势小穗(第5-15小穗)结实和第1-3小花位子粒发育是提高小花结实率和穗粒重的关键。 相似文献
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河南小麦品种穗粒数性状的动态变化及全基因组关联分析 总被引:1,自引:0,他引:1
《分子植物育种》2017,(10)
穗粒数是小麦产量构成的重要因子,研究小麦穗粒数及其相关性状的变化规律与遗传机制对于高产育种具有指导意义。以198份河南种植或审定的小麦品种(系)为材料,在4个环境下鉴定穗粒数相关性状表现,选用660K SNP芯片检测材料的基因型并进行全基因组关联分析。发现穗粒数存在着广泛的变异,穗粒数、穗长、总小穗数、可育小穗数和不育小穗数的广义遗传力分别为77.43%、87.54%、85.45%、79.70%和68.08%,2002年以前、2003-2008年、2009-2014年和2015年以来育成品种的平均穗粒数分别为35.71个、36.85个、37.40个和37.98个,随着育种时期的推进总小穗数和可育小穗数也表现出逐渐提高的趋势。共发现41个和穗粒数等性状相关联的位点,分布在除了1D、3A、3D、4B和4D的16条染色体上,单个关联位点的表型变异贡献率(R2)范围为6.19%~20.83%,其中10个位点至少在2个环境中稳定表达。对关联位点进一步分析发掘了多个与穗粒数性状相关的优异等位变异,如7A上AX-109368219(A)能增加穗粒数1.86粒,2A上AX-111674224(C)能提高总小穗数0.96个,2D上AX-111582877(G)能提高可育小穗数0.73个。研究揭示近五十年河南小麦穗粒数性状的动态变化及其规律,获得了多个和穗粒数等性状关联位点及等位变异,为小麦产量性状的遗传改良及分子设计育种提供了技术支持和基因资源。 相似文献
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播种密度对冬小麦不同穗位与粒位结实粒数和粒重的影响 总被引:16,自引:1,他引:15
利用重穗型小麦品种兰考矮早八和中间型品种周麦18,研究了不同播种密度对结实粒数与粒重的小穗位和粒位效应的影响。结果表明,不同穗型冬小麦品种小穗位结实粒数、小穗重及不同粒位粒重均随着小穗位自基部至顶部呈先增后降的二次曲线变化;不同穗型冬小麦品种穗部籽粒的分布差异显著,主茎穗的结实特性及粒重均优于分蘖穗;随着播种密度的下降,穗部结实特性和粒重有优化的趋势,重穗型品种兰考矮早八对密度的反应更为敏感,中间型品种周麦18小穗位和粒位对播种密度的调节效应较强;不同部位小穗粒重因结实粒数的差异表现出不同的粒位效应,下部和中部小穗位的第2粒位粒重较大,而位于上部和顶部小穗位第1粒位粒重较大,第3粒位粒重次于第1和第2粒位,第4粒位粒重最小。在小麦栽培中,应在保证主茎穗的基础上适当增加分蘖穗的比例。并在保证结实粒数的基础上提高粒重,尤其是下部小穗的结实粒数和粒重。同时,在保证第1、2粒位粒重的前提下最大限度地发挥第3、4粒位的粒重潜力,可以使小麦实现高产稳产。 相似文献
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为探明植物激素乙烯对小麦穗发育和籽粒形成的影响,以春小麦扬麦15为材料,在药隔期使用乙烯利与乙烯受体抑制剂1-甲基环丙烯(1-MCP)处理植株,分析籽粒形态并观察穗部性状,探究乙烯利和1-MCP处理前后穗发育进程和穗部不同部位籽粒形成过程。结果表明,乙烯利对小麦小花退化过程无显著影响,而1-MCP能显著降低小花退化率;乙烯利能够促进籽粒成熟,加速籽粒发育,减小籽粒体积;1-MCP会延缓小麦的生长发育,促进颖果生长,增加籽粒体积;乙烯利显著降低了小麦株高、顶部穗粒数、顶部穗粒重以及千粒重;高浓度乙烯利还能显著降低小穗数、顶部和中部穗粒数、每穗粒数等。1-MCP能够显著提高小麦颖果干重、颖果鲜重、小穗数、中部穗粒数、基部穗粒数、每穗粒数以及穗粒重,最终增加千粒重。 相似文献
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黄淮麦区4省小麦种质农艺性状的比较分析 总被引:1,自引:0,他引:1
为明确小麦种质资源的遗传差异和特点,提高其利用效率,以株高、穗长、小穗数、穗粒数、千粒重5个主要农艺性状为指标,对来自黄淮麦区4省(河北、山东、河南和山西)的263个小麦品种(系)进行统计分析。显著性分析结果表明,除穗粒数外,4个省的小麦种质在其余各农艺性状上差异极显著。变异性分析结果表明,供试材料的5个农艺性状中穗粒数变异系数最大,小穗数变异系数最小;4省中,河北小麦株高、千粒重的变异系数最小,穗粒数变异系数最大;河南小麦穗长、小穗数和穗粒数的变异系数最小,千粒重变异系数最大;山东小麦穗长的变异系数最大;山西小麦株高、小穗数的变异系数最大。相关分析结果表明,株高与穗长呈极显著正相关,与小穗数呈极显著负相关;穗长与小穗数、穗粒数呈极显著正相关;小穗数与穗粒数呈极显著正相关;千粒重与穗粒数呈极显著负相关。因此,在育种实践中,可根据4省小麦种质农艺性状的变异特点筛选符合目标性状的亲本材料,同时加强种质基因库的更新。 相似文献
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薏苡主要农艺性状的相关及通径分析 总被引:9,自引:0,他引:9
对来自不同地区的12个薏苡种质资源的10个主要数量性状进行了相关、通径和主成分分析,结果表明:薏苡10个主要数量性状之间存在相关关系,其中生育期与株高、主茎小花数、节数、千粒重呈极显著正相关而与小花数和穗粒数呈极显著负相关;生育期长的品种正向效应大于负向效应。生育期、主茎小花数、小花结实数是影响单株产量的主要因素,且以主茎小花数影响和贡献最大。 相似文献
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外源多胺对小麦小花退化的调控机制 总被引:1,自引:0,他引:1
小麦穗粒数与小花退化密切相关,多胺是调控小花发育的一种重要植物生长调节剂。本研究利用小麦品种(系)双大1号(大穗型)和西农538 (小穗型),于小花退化阶段在穗部施用腐胺(Put)、亚精胺(Spd)和精胺(Spm),分析外源多胺对小麦小花退化的影响及其与内源激素、植株碳氮的关系。结果表明,外源Spd和Spm显著抑制小花退化、提高了可孕小花数目,而Put加具有显著的负效应;并且多胺的调控具有明显的位置效应,对小穗上部弱势小花退化的调控效应显著大于下部强势小花。施用外源Spd和Spm后,弱势小花中Spd、Spm显著增加,同时玉米素+玉米素核苷(Z+ZR)含量及其与脱落酸(ABA)的比值也显著升高,而内源乙烯的释放速率降低,并且弱势小花中可溶性总糖和可溶性蛋白质含量显著提高。外源Put对弱势小花的控调效应与此相反,施用后弱势小花中Put、ABA含量以及内源ETH释放速率显著提高,而(Z+ZR)与ABA比值和可溶性总糖含量降低。因此认为,多胺参与了对小麦小花退化的调控,其对小麦小花退化的调控与内源激素、植株碳氮代谢密切相关。 相似文献
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Increasing sink size (i.e. number of grains m−2 ) has been the way of the genetic improvement for obtaining higher grain yield of wheat. We have studied under field conditions the number of fertile florets and grains per spike and individual grain weight of three bread wheat cultivars ( Klein Favorito, Eureka FCS and Buck Pucara ) which were previously selected to represent cultivars released at different eras (1920, 1940 and 1980, respectively) in Argentina (S lafer and A ndrade 1989).
The three cultivars Buck Pucara, Eureke FCS , and Klein Favorito averaged 56.9, 48, and 34.5 grains spike−1 . Differences were observed in both main shoot and tiller spikes. The number of fertile florets at anthesis was greater in the modern cultivar than in the other two cultivars; however, the intermediate and old cultivars did not significantly differ in this trait. Differences in number of florets and number of grains spike were independent of the number of spikelets spike−1 ; spikelet numbers did not vary among the three cultivars. Therefore, both the number of fertile florets produced per spikelet and the ability of the cultivar to set grains in those florets were responsible for the different number of grains spike−1 among cultivars. The modern, high yielding cultivar had a lower individual grain weight than the old, low yielding cultivar when the average of all grains were considered; but basal grains of its central spikelets were as heavy as those of the other cultivars.
We suggest (i) that the modern cultivars of Argentina have increased their ability both to produce fertile florets and to set grains, and (ii) that the lower individual grain weight of the modern cultivars does not imply an increased competition for resources as a consequence of their higher number of grains. 相似文献
The three cultivars Buck Pucara, Eureke FCS , and Klein Favorito averaged 56.9, 48, and 34.5 grains spike
We suggest (i) that the modern cultivars of Argentina have increased their ability both to produce fertile florets and to set grains, and (ii) that the lower individual grain weight of the modern cultivars does not imply an increased competition for resources as a consequence of their higher number of grains. 相似文献
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小麦籽粒产量及穗部相关性状的QTL定位 总被引:12,自引:7,他引:5
由小麦品种花培3号和豫麦57杂交获得DH群体168个株系,种植于3个环境中,利用305个SSR标记对籽粒产量和穗部相关性状(穗长、穗粒数、总小穗数、可育小穗数、小穗着生密度、千粒重和粒径)进行了QTL定位。利用基于混合线性模型的QTLNetwork 2.0软件,共检测到27个加性效应和13对上位效应位点,其中 8个加性效应位点具有环境互作效应。相关性高的性状间有一些共同的QTL位点,表现出一因多效或紧密连锁效应。5D染色体区段Xwmc215–Xgdm63,检测到控制籽粒产量、穗粒数、总小穗数、可育小穗数和小穗着生密度5个性状的QTL位点,各位点的遗传贡献率较大且遗传效应方向相同,增效等位基因均来源于豫麦57,适用于分子标记辅助育种和聚合育种。控制千粒重与穗粒数的QTL位于染色体不同区段,有利于实现穗粒数与粒重的遗传重组。 相似文献
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Relationships between grain yield attributes and response to agronomic practices of dwarf and tall genotypes in the major U.S. wheat region were investigated. Isogenic tall, semidwarf, and doubledwarf (Norin 10/5/Pawnee) 'Pawnee' winter wheat ( Triticum aestivum L.) lines were planted in a split-split-plot design with nitrogen fertilizer rates of 0, 50, and 100 kg ha−1 as main plots and seeding rates of 30, 60, and 90 kg ha−1 as subplots in four replications at Hutchinson and Manhattan, Kansas, during 1980–1981. There was no evidence that dwarf lines responded better than the tall line to nitrogen fertilizer; however, percentage fertile spikelets, spike length, harvest index, and kernel number per spike of the semidwarf line were favored by high nitrogen rates. Grain yield was more responsive to seeding rate in the doubledwarf line than in the other lines, and test weight and spike number per unit area were more responsive to seeding rate in one or both dwarf lines than in the tall line. Grain yield of each genotype depended highly on the predominant yield attributes — usually spike number per unit area and/or kernel weight — at one or both locations. 相似文献
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玉米雌穗分化与籽粒发育及败育的关系 总被引:6,自引:2,他引:6
以郑单958 (ZD958)和登海661 (DH661)为试材,比较研究了4.5、7.5、10.5万株hm-2三个种植密度下,雌穗分化与籽粒发育及败育的关系。结果表明,密度对玉米雌穗原基开始分化的时间无影响(不同密度下,穗原基均在播后28~29 d左右开始分化),对吐丝期分化的小花总数影响很小。但是高密度推迟了雌穗的分化进程,增加了败育花和未受精花的数目,导致正常成熟小花数目的降低。与低密度相比,高密度下DH661正常小花数减少了100.0个,ZD958减少了76.4个。高密度加大了雌雄穗吐丝开花间隔,降低了吐丝植株的比例(DH661吐丝植株占93.64%;ZD958的占81.80%),推迟了吐丝时间,使单株吐丝量减少,散粉持续时间缩短,导致败育增加。正常受精的小花在灌浆期也会发生籽粒败育,尤其是在花后10 d左右败育严重。相关分析表明,玉米最终的穗粒数与开花期以及花后10 d、20 d的冠层底部透光率相关性显著,花败育率与开花前冠层底部透光率显著负相关。 相似文献
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Evaluation of grain yield and its components in wheat cultivars and landraces under near optimal and drought conditions 总被引:3,自引:0,他引:3
In a 2-years experiment, 30 wheat cultivars and 21 landraces from different countries were tested under near optimum and drought
stress conditions. Plant height, number of sterile spikelets per spike, spikelets per spike, number of kernels per spike,
kernel weight per spike, 1000 kernel weight and grain yield were evaluated. The number of kernels per spike, 1000 kernel weight
and especially yield were more sensitive to drought stress in the cultivars than plant height and number of spikelets per
spike, while in the landraces these traits did not differ under drought stress compared to near optimum conditions. The average
yield of cultivars was significantly better than the average yield of landraces under near optimum as well as drought stress
conditions. Path coefficient analysis showed that for cultivars under near optimum conditions there was no significant direct
association of any of the analysed characters with yield, while under drought stress conditions, number of kernels per spike
had a significant positive direct effect. Under drought stress conditions, the number of sterile spikelets displayed a negative
direct effect, while kernel weight per spike had a positive direct effect on yield. Hierarchical cluster analysis was used
as a tool to classify cultivars and landraces according to their yield ability under near optimum and drought stress conditions.
Among the cultivars, two groups out of five and among one of three in the landraces were characterised by high yields in both
near optimum as well as under drought stress conditions. These genotypes may serve as sources of germplasm for breeding for
drought tolerance.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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Yield determination in triticale as affected by radiation in different development phases 总被引:4,自引:0,他引:4
Gaspar Estrada-Campuzano Daniel J. Miralles Gustavo A. Slafer 《European Journal of Agronomy》2008,28(4):597-605
The critical period for grain yield determination has not been determined for triticale. We aimed to identify it, determining the relative importance of both the major yield components and the dry matter acquisition by the spikes at anthesis. A field experiment was carried out with two triticales, differing in tillering capacity, subjected to shading treatments at five different timings from early tillering to maturity. Results showed that reductions in grain yield were more significant when shading was imposed during 3 weeks before and 1 week after anthesis. Reductions in grain yield by shading treatments were associated with lower number of grains per m2 more than with changes in the average grain weight. Reductions in grains per m2 were due to reductions in the number of fertile florets per spike, affecting grains per spike. The assimilate acquisition by the spikes during the critical period was a key determinant of floret survival. Grain number per m2 was related with photothermal quotient during 30 days before anthesis and spike dry weight at anthesis, though the goodness of the prediction compared with wheat, was lowered by poorer grain setting percentage. 相似文献