共查询到20条相似文献，搜索用时 31 毫秒
1.
S—3307浸种对小麦种子活力和幼苗素质的调节效应 总被引：3，自引：1，他引：2
用不同浓度的S-3307溶液浸种，对小麦种子发芽率没有明显地影响，对发芽势和发芽指数有抑制作用，分别降低11.1％～22.2％和6.9％～16.0％。用S-3307溶液浸种的，由于单株于重增加，尤其是根系干重增加较多，所以活力指数有所提高。用S-3307溶液浸种的，麦苗素质提高．抗逆性增强，先合性能改善，为提高单产奠定基础。 相似文献
2.
本试验以当年刚收获的休眠小麦济南17种子为材料,研究了发芽温度、发芽床两因素对休眠小麦种子发芽势、发芽率的影响。结果表明：休眠小麦种子最适宜的发芽条件是20℃、沙床。 相似文献
3.
M. Farooq S. M. A. Basra H. Rehman & B. A. Saleem 《Journal of Agronomy and Crop Science》2008,194(1):55-60
In rice–wheat systems, late sowing of wheat is the major reason of low yield. This yield reduction is principally due to lower and erratic germination, and poor crop establishment because of low temperature prevailing. The present study was conducted to explore the possibility of improving late sown wheat performance by seed priming techniques. Seed priming strategies were: on‐farm seed priming, hydropriming for 24 h, seed hardening for 12 h and osmohardening with KCl or CaCl2 for 12 h. Seed priming improved emergence, stand establishment, tiller numbers, allometry, grain and straw yield, and harvest index. However, seed priming techniques did not affect plant height, number of spikelets, number of grains and 1000 grain weight. Osmohardening with CaCl2 gave more grain and straw yield and harvest index compared with control and other priming treatments, followed by osmohardening with KCl and on‐farm seed priming. Improved yield was attributed principally to better stand establishment and improved number of fertile tillers. Seed priming techniques can be effectively used to improve the performance of late sown wheat. 相似文献
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花楸树果实浸泡液的萌发抑制作用 总被引：2，自引：0，他引：2
对花楸树种子形态及果肉、种子、去皮种子不同浸泡时间下的浸泡液对小麦和白菜种子发芽率及幼苗生长的抑制作用进行了研究。结果表明,花楸树果实果肉、种子、去皮种子浸泡液中均含有水溶性萌发抑制物质,不仅抑制小麦、白菜种子萌发,而且抑制其幼苗高生长和根的伸长。在几种浸泡时间中,浸泡8小时的去皮种子浸泡液对白菜、小麦种子发芽率的抑制作用最为明显,其发芽率分别为65%、89%,但随着浸泡时间的延长而降低;浸泡8h的果肉浸泡液对白菜和小麦幼苗高生长和根伸长的抑制作用最为明显,种子和去皮种子浸泡液(8h)的抑制作用对小麦和白菜的抑制作用次之,随着浸泡时间的延长,果肉浸泡液的抑制作用逐渐减弱,因而采收下来的果实及时净种是清除果肉水溶性抑制物质简单有效的方法。种子内部所含的一些成分是引起种子休眠及发芽率低的内因。 相似文献
5.
Genetic mapping within the wheat D genome reveals QTL for germination, seed vigour and longevity, and early seedling growth 总被引：1，自引：1，他引：0
Quantitative trait loci (QTL) controlling germination, seed vigour and longevity, and early seedling growth were identified
using a set of common wheat lines carrying known D genome introgression segments. Seed germination (capacity, timing, rate
and synchronicity) was characterized by a standard germination test, based either on the 1 mm root protrusion (germination
sensu stricto) or the development of normal seedlings. To quantify seed vigour, the same traits were measured from batches
of seed exposed for 72 h at 43°C and high (ca. 100%) humidity. Seed longevity was evaluated from the relative trait values.
Seedling growth was assessed both under non-stressed and under osmotic stress conditions. Twenty QTL were mapped to chromosomes
1D, 2D, 4D, 5D, and 7D. Most of the QTL for germination sensu stricto clustered on chromosome 1DS in the region Xgwm1291–Xgwm337. A region on chromosome 7DS associated with Xgwm1002 harboured loci controlling the development of normal seedlings. Seed vigour-related QTL were present in a region of chromosome
5DL linked to Xgwm960. QTL for seed longevity were coincident with those for germination or seed vigour on chromosomes 1D or 5D. QTL for seedling
growth were identified on chromosomes 4D and 5D. A candidate homologues search suggested the putative functions of the genes
within the respective regions. These results offer perspectives for the selection of favourable alleles to improve certain
vigour traits in wheat, although the negative effects of the same chromosome regions on other traits may limit their practical
use. 相似文献
6.
Md. Abu Hasan Jalal Uddin Ahmed Tofazzal Hossain Md. Abdul Khaleque Mian Md. Moynul Haque 《Journal of Crop Science and Biotechnology》2013,16(1):69-74
To examine the effect of high temperature during seed development and maturation on seed quality of wheat, seeds of four heattolerant and two heat-sensitive wheat genotypes obtained normal and high temperature growing conditions were tested for quality. High parent plant growth temperature during seed development and maturation resulted in poor seed quality. The effect of parent plant growth temperature on seed germination and speed of germination was inconsistent between heat tolerant and heat-sensitive wheat genotypes. Seed vigor as indicated by seed density, conductivity of seed leachates, seedling dry weight, production of normal seedlings, seed reserve utilization efficiency, and seedling emergence were reduced in all wheat genotypes due to higher parent plant growth temperature but heat-sensitive wheat genotypes were affected more than the heat-tolerant genotypes. 相似文献
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预浸及赤霉素对番茄种子发芽的影响 总被引：1，自引：1，他引：1
当年收获的新鲜番茄籽经过适时(12小时)通气吸水处理后再度干燥至原含水量,短期贮藏后萌发实验表明,番茄种子预浸可以有效地破除新鲜籽的“浅休眠”,可以缩短番茄种子的萌发时间,提高种子萌发的一致性,并明显地增加幼苗主根的长度。种子发芽基质若添加一定浓度的赤霉素,也可以打破番茄鲜籽的“浅休眠”,但对番茄种子发芽的其它特点影响不大。试验结果还表明,预浸与赤霉素时番茄种子的生活力没有明显的作用。 相似文献
9.
以红蓼(Polygonum orientale L.)种子为试验材料,研究不同药剂和不同水温浸种、不同储藏方式对红蓼种子萌发的影响.结果表明:红蓼种子在0.5 g/mL浓度的NaOH下浸泡45 min发芽率最高,达99.63％;综合NaOH浓度及处理时间,在0.3～0.5 g/mL范围,浸泡45 min可以使红蓼种子发芽快而整齐,发芽率高.低温贮藏可以打破红蓼种子休眠,室外地表自然放置发芽率较高,达19.93％,显著高于常温保存.红蓼种子浸种2h后吸水速度最快,24 h达吸水高峰;60℃温水浸种24 h发芽效果好于其他水温,发芽率达26.67％;70℃处理种子失去生活力.萘乙酸、吲哚乙酸处理红蓼种子效果不显著.种皮硬度及休眠是影响红蓼种子发芽的主要原因. 相似文献
10.
Because preharvest sprouting decreases quantity and quality of wheat grain, researchers need effective protocols to assess
response to preharvest sprouting conditions. The aim of this study was to determine which temperature gives the greatest difference
in seed germination and expression of seed dormancy in 10 spring wheat genotypes. The genotypes were grown in the field near
Swift Current, Saskatchewan in 2000 in a randomized complete block with four replicates. Seed samples were harvested at approximately
25% moisture content (wet weight basis) and dried to 12% moisture content with minimal after-ripening. Germination was under
controlled environment at temperatures of 10, 15, 20 and 30 °C in darkness. A weighted germination index (WGI) was calculated.
The analysis of WGI, for each temperature, showed highly significant (p ≤ 0.01) genotype effects on germination. Most genotypes decreased in WGI (increased dormancy) as temperature was increased
from 10 to 30 °C. The greatest differences in seed germination tended to be at 15 °C and 20 °C. The level of seed dormancy
depended on the genotype and germination temperature.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
11.
“一串红”种子引发技术研究 总被引：1，自引：0，他引：1
采用了多因子变量的方法,以当年采收(优质)和自然储藏1年(劣质)的一串红种子为材料,用不同浓度PEG、KNO3、PEG+KNO3和不同处理时间对一串红种子进行引发效果研究,旨在提高一串红种子的发芽率。结果表明:(1)1.0%PEG处理12h可以提高优劣种子的发芽率约为16.7%;(2)2.5%KNO3处理12h提高的发芽率分别为20%,26.7%;(3)1.0%PEG+2.5%KNO3处理优劣种子12h发芽率分别可以提高23.3%,26.7%. 相似文献
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多胺对玉米种子吸胀期间耐冷性和种子发芽能力的影响 总被引：20，自引：2，他引：18
以玉米耐寒自交系黄C和低温敏感自交系Mo17为材料, 研究了亚精胺(Spd)和精胺(Spm)引发对玉米种子吸胀中的耐冷性和种子发芽能力的影响。种子经0.25 mmol L-1的Spd和Spm引发72 h后, 在5℃下低温吸胀不同时间(12、24、36和48 h)。结果表明, Spd和Spm引发提高了胁迫期间两自交系胚内过氧化物酶(POD)、过氧化氢酶(CAT)、超氧化物歧化酶(SOD)和抗坏血酸过氧化物酶(APX)活性, 以及可溶性蛋白质和脯氨酸(Pro)含量, 降低了胚渗出液的核苷酸含量, 同时显著提高发芽率, 并显著缩短平均发芽时间。低温吸胀48 h后, 与对照相比, Spd和Spm处理分别提高两自交系种子的平均发芽率18.5%和14.0%, 分别缩短平均发芽时间1.21 d和1.14 d。黄C在种子吸胀期间的耐冷性强于Mo17。总之, Spd和Spm处理能提高玉米种子吸胀期间的耐冷性, 提高低温胁迫下种子发芽能力。 相似文献
14.
冬小麦种子的发育及其田间活力 总被引：1，自引：1，他引：0
１９９３－１９９４年北京对六冬小麦品种籽粒发育程度及不同发育程度籽粒的发芽力、活力进行了研究。从花后５天开始每３天取样一次,测定籽粒的干重,观察了其中两种材料发育早期籽粒种胚的器官分化,对各发育程度种子进行了标准发芽测定及田间幼苗活力鉴定。 相似文献
15.
以转反义TRX s基因豫麦18和对照（豫麦18）为试材，测定了小麦种子萌发过程中胚乳内thiocalsin、苹果酸脱氢酶、谷丙转氨酶的活性以及游离氨基酸含量的变化。结果表明，反义TRX s基因的导入能够增加对thiocalsin和苹果酸脱氢酶的抑制，降低其活性，使储存蛋白更难于被降解，谷丙转氨酶增高的速度减慢，种子氨基酸代谢减弱。说明蛋白质代谢缓慢是转反义TRX s基因小麦抗穗发芽的一个主要原因。 相似文献
16.
转反义TRX s基因对小麦萌发过程中储藏蛋白降解的影响 总被引：1，自引：0，他引：1
以转反义TRX s基因豫麦18和对照（豫麦18）为试材,测定了小麦种子萌发过程中胚乳内thiocalsin、苹果酸脱氢酶、谷丙转氨酶的活性以及游离氨基酸含量的变化。结果表明,反义TRX s基因的导入能够增加对thiocalsin和苹果酸脱氢酶的抑制,降低其活性,使储存蛋白更难于被降解,谷丙转氨酶增高的速度减慢,种子氨基酸代谢减弱。说明蛋白质代谢缓慢是转反义TRX s基因小麦抗穗发芽的一个主要原因。 相似文献
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白皮小麦收获前穗发芽及品种抗性机制探讨 总被引：24，自引：1，他引：23
对４８个白皮小麦种质及２个红皮小麦种质连续３年测定结果,品种间收获前穗发芽率,籽粒发芽率及收获后种子休眠特性差异显著。穗发芽敏感性因年份和种子发育时期而异,开花后３５－４０天较敏感,品种间差异大。休眠期长短与穗发芽率间呈极显著负相关。收获后的种子α－淀粉酶活性,降落值,与穗发芽率间分别呈极显著正相关和极显著负相关。 相似文献
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河北种质库部分作物种子生活力监测分析 总被引：1，自引：0，他引：1
对河北省种质库中21种作物1.3万多份种子进行了生活力监测,结果表明,①贮存12~17年后,94.55%以上的被监测种子发芽率仍保持在80%以上,但有292份种子(占被监测份数的2.00%)发芽率出现了明显下降(从80%以上降至70%以下)。②不同作物种子发芽率的变化趋势不完全相同,燕麦和冬小麦亲本两种作物种子平均监测发芽率出现了显著下降。同一作物不同品种、荞麦、冬小麦和玉米不同类型、燕麦入库不同批次、夏大豆不同收获年代等贮藏后发芽率的变化也存在明显差异。与黄粒玉米相比,白粒玉米监测发芽率显著低于入库发芽率,但尚需扩大监测品种数量以验证其普遍性。 相似文献