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1.
萌发3天的花生种子胚轴核酸总含量达高峰,以后随萌发时间延长而降低。DNA含量萌发第1天最高,以后渐减,且高活力种子明显高于中等活力种子。RNA含量为萌发后第3天最高,其后下降,但中等活力种子含量高于高活力种子。紫外吸收扫描表明,中等活力花生种子紫外吸收峰下降,吸收波长也发生改变,且在萌发后期更为显著,表明胚轴核酸的变化与种子活力密切相关。 相似文献
2.
应用ELISA测定了萌发花生种子中CaM的含量,种子的大部分CaM存在于胚轴中,小部分存在于子叶。高活力种子CaM含量较高,在吸胀48h出现一个特征峰,随种子活力下降,CaM含量也减少,其特征峰延迟至 72h才出现,且峰值也低,Ca~(++)可提高种子活力,也提高CaM的含量,使特征峰从72h提早到48h出现,TFP使种子CaM含量下降,直至萌发96h仍来山现特征峰,Ca~(++)、CaM与种子活力密切相关。 相似文献
3.
花生种子(粤油116)经纯甲醇浸种1小时,活力明显下降,活力指数是对照的29％;细胞膜透性增大,浸种过程溶质渗漏增加。种子经甲醇胁迫后在珍珠岩中预吸水3小时,能部分地抵消甲醇的胁迫效应,种子活力提高,膜有所修复,水分的存在使甲醇的伤害作用更大,在种子劣变程度和甲醇浓度之间没有正相关。 相似文献
4.
花生种子经人工老化处理后活力明显下降,用25％PEG处理可提高种子活力,从扫描电镜观察看到,高活力种子胚根表皮细胞完整,老化处理后,表皮细胞呈疏松突起,严重的成块状脱落,皮层裸露,出现畸形很尖,能谱分析表明,高活力种子胚根尖细胞内含有多种元素,其含量的百分比顺序为:K>Ca>Si>P>S>Al>Cl。根尖含Ca最多,越往上部逐渐减少;K的含量却相反,根尖最低,越往上部越高,人工处理的种子Ca含量明显下降,老化10天以上的种子,胚根尖细胞的Ca完全消失,K的含量也随老化时间的增加而减少,PEG渗调处理能明显增加Ca的含量,减少细胞劣变的损伤,防止表皮细胞的脱落,因而提高种子活力。 相似文献
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用5个不同浓度的油菜素内酯溶液浸种处理黄豆种子,放在2种不同的温度下培养,观测其对种子发芽、下胚轴和胚根生长的影响.结果表明,用不同浓度的天然油菜素内酯处理对黄豆种子的发芽率和下胚轴生长均有明显的促进作用.在15℃和27℃下,0.05mg/L的油菜素内酯处理的黄豆种子发芽率最高,都达到了93.3%,分别比对照组增加了19.8%和14.8%;27℃下0.05mg/L的油菜素内酯处理的黄豆种子下胚轴伸长最长,达13.6cm;15℃和27℃下各油菜素内酯处理的黄豆种子胚根伸长均低于对照组,表明油菜素内酯对胚根的生长有抑制作用. 相似文献
7.
以黄瓜品种＂津研4号＂为材料,研究了低温下黄瓜种子萌发过程中脂肪酶活性和脂肪酸含量的变化.结果表明：常温下黄瓜种子萌发过程中脂肪酶活性随时间呈现先升高再降低的变化趋势,脂肪酸含量随时间增加而增加;低温胁迫下脂肪酶活性、脂肪酸含量也呈现出与常温相同的趋势,但脂肪酶活性高峰出现的时间远远滞后于常温,脂肪酶的最大活性高于常温. 相似文献
8.
《文山学院学报》2014,(3):17-20
采用化学法萃取和GC-MS法对花生和紫苏种子的含油率及其脂肪酸组分进行研究。实验结果表明,花生的含油率为34.60%,紫苏种子的含油率为39.40%。GC-MS分析结果表明,花生油中共检测出8种脂肪酸组分,即:亚油酸、油酸、棕榈酸、硬脂酸、山嵛酸、10-十八碳烯酸、花生酸、花生一烯酸;紫苏种子油中共检测出5种脂肪酸组分,即:棕榈酸、亚油酸、α-亚麻酸、硬脂酸和10-十八碳烯酸。花生油中脂肪酸的主要组分是亚油酸53.05%、油酸31.74%、棕榈酸7.95%;紫苏种子油脂肪酸的主要组分是α-亚麻酸80.06%、亚油酸11.83%、棕榈酸5.37%。花生油和紫苏种子油中不饱和脂肪酸的含量分别为85.21%和92.81%。 相似文献
9.
选用花生种子为试材,研究不同浓度的硒对花生苗期生长及脂肪酶活力的影响.结果表明:在硒浓度为0.5 mg.L-1时,硒对花生种子发芽率和发芽势有较好的促进作用;硒浓度为1.0 mg.L-1时,MDA含量较低,叶绿素含量较高;硒浓度为3.0 mg.L-1时,脂肪酶活力较高,有利于花生的生长发育;硒浓度为5.0 mg.L-1时,对花生根长和POD活性有较好的促进作用.综合分析,低浓度硒能提高花生种子的发芽率,增加发芽势和根长,对花生苗期生长有促进作用,但高浓度(6.0 mg.L-1)时对花生种子的萌发和幼苗生长则有明显的抑制作用. 相似文献
10.
研究了人工老化处理时间(1、2、4、6、8、10、12、14、16、18 d)和自然老化1 a对卫红花一号种子发芽势、发芽率和简易活力指数的影响.结果表明:随着人工老化处理时间的延长,红花种子的发芽势、发芽率和简易活力指数呈下降趋势,其中人工老化处理1~4 d对种子发芽势、发芽率、简易活力指数的影响不大.自然老化1 a的红花种子活力与老化处理6 d的红花种子活力水平相当,与对照相比各项指标差异显著. 相似文献
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12.
Dong-dong CAO Jin HU Xin-xian HUANG Xian-ju WANG Ya-jing GUAN Zhou-fei WANG 《Journal of Zhejiang University. Science. B》2008,9(12)
The changes of kernel nutritive components and seed vigor in F1 seeds of sh2 sweet corn during seed development stage were investigated and the relationships between them were analyzed by time series regression (TSR) analysis. The results show that total soluble sugar and reducing sugar contents gradually declined, while starch and soluble protein contents increased throughout the seed development stages. Germination percentage, energy of germination, germination index and vigor index gradually increased along with seed development and reached the highest levels at 38 d aider pollination (DAP). The TSR showed that, during 14 to 42 DAP, total soluble sugar content was independent of the vigor parameters determined in present experiment, while the reducing sugar content had a significant effect on seed vigor. TSR equations between seed reducing sugar and seed vigor were also developed. There were negative correlations between the seed reducing sugar content and the germination percentage, energy of germination, germination index and vigor index, respectively. It is suggested that the seed germination, energy of germination, germination index and vigor index could be predicted by the content of reducing sugar in sweet corn seeds during seed development stages. 相似文献
13.
采用光谱法对几种干果中蛋白质的含量进行分析.光谱法的最大吸收波长为280nm,回归方程为A=0.5321C-0.0173,相关系数r=0.9999,线性范围为0～1.4973mg/mL.变异系数0.24％,回收率为99.32％～103.3％.实验结果表明,测定的干果样品中花生仁蛋白质含量最高为243mg/g. 相似文献
14.
在全光照条件下培养红树植物桐花树(Aegiceras Corniculatum)3a龄苗1a,以人工海水(盐度8g.kg-1)为对照,研究了淡水种植对桐花树开花结果的影响.结果表明:人工海水组比淡水组提前23d出现花蕾;淡水组的最早始花日期比人工海水组延迟了50d.两种处理下桐花树的花序数随时间的变化呈现出两个生长高峰期,即第一个生长高峰期出现在2010年12月,第二个生长高峰期在2011年4月.在4月份,淡水组的花序数显著多于人工海水组.两种处理的桐花树座果数及其成熟果实的果重、粗度和长度之间均不存在显著差异.试验表明,桐花树在淡水环境里能够正常开花结果. 相似文献
15.
Dong-dong Cao Jin Hu Xin-xian Huang Xian-ju Wang Ya-jing Guan Zhou-fei Wang 《Journal of Zhejiang University. Science. B》2008,9(12):964-968
The changes of kernel nutritive components and seed vigor in F1 seeds of sh
2 sweet corn during seed development stage were investigated and the relationships between them were analyzed by time series
regression (TSR) analysis. The results show that total soluble sugar and reducing sugar contents gradually declined, while
starch and soluble protein contents increased throughout the seed development stages. Germination percentage, energy of germination,
germination index and vigor index gradually increased along with seed development and reached the highest levels at 38 d after
pollination (DAP). The TSR showed that, during 14 to 42 DAP, total soluble sugar content was independent of the vigor parameters
determined in present experiment, while the reducing sugar content had a significant effect on seed vigor. TSR equations between
seed reducing sugar and seed vigor were also developed. There were negative correlations between the seed reducing sugar content
and the germination percentage, energy of germination, germination index and vigor index, respectively. It is suggested that
the seed germination, energy of germination, germination index and vigor index could be predicted by the content of reducing
sugar in sweet corn seeds during seed development stages.
Project supported by the National Natural Science Foundation of China (No. 30370911) and Education Department of Zhejiang
Province, China (No. 20070147) 相似文献
16.
“生态足迹”作为一种生物物理量的定量测评方法,在全球范围内应用越来越广泛。本文在获取大量基础数据的基础上,计算了楚雄市1993--2007年的生态足迹。通过计算发现,楚雄市的人均生态足迹逐年上升,从1993年的0．68hm2上升到2007年的1．02hm2。其中,耕地生态足迹增长对人均生态足迹上升的贡献率最大。生态足迹的上升与GDP的增长有明显的相关关系（R=0．803）,通过曲线拟合,发现二者CUB曲线拟合度最高,为0．829。 相似文献
17.
Ms. Evelyn Unes Hansen 《Innovative Higher Education》1980,4(3):212-221
Faculty of the General College are assigned advising responsibilities in addition to their teaching load. Full-time members, for example, advise 35–40 students per year. When the College initiated an individualized baccalaureate degree program in 1971, little provision was made for consequent changes on the advising function and the academic load. As a result, advisers, faced with the complex and time-consuming matters that adhere to individualized learning programs, felt mounting pressure. Large numbers of evening school students were attracted to the program and sought advice and, upon admission, expected to be assigned a faculty adviser. The College made no formal acknowledgment of the addition of the non-day school advisees to advisers' loads. Strained by the overburden, faculty participated in this study to identify how much real time they spend in advising, with whom, and on what kinds of activities. Evidence from this study was used to support their request for recognition by the College of the changed nature and full scope of their advising work.The author wishes to acknowledge Drs. Paul J. Feltovich and Thomas Brothen for their help with the researching of this paper. 相似文献
18.
黄小倩 《常熟理工学院学报》2007,21(5):38-41
人情作为一个本土概念,在日常人际交往中为每个人所熟知.它的产生有其独特的社会文化背景,其中农业社会的结构特征与儒家文化的熏陶教化共同发挥了重要的作用.人情交往反映了一种欠与报的交换关系,而其中关系、面子等因素又与人情有着千丝万缕的联系.通过对一节剧情的描述可以清晰地体现出这些特点,同时也能够反映出人情社会中的一些日常行动策略. 相似文献
19.
Robert Pasnak Brittany N. Thompson Katrina M. Gagliano Matthew T. Righi K. Marinka Gadzichowski 《The Journal of educational research》2019,112(4):528-534
Knowing what kinds of patterns are easy for children to recognize early in their kindergarten year, and what kinds are difficult, can be a useful guide for patterning instruction. Hence, the ability of children to recognize complex patterns early in their kindergarten year was assessed in two experiments. One experiment showed that the children were significantly less accurate on patterns made of progressively higher numbers or of letters that came progressively later in the alphabet than on patterns made of clock faces that showed increasing amounts of time or were made of rotating objects. There was an interaction between the type of element of which the pattern was composed and the pattern’s orientation. A second experiment showed that symmetric patterns were easier than growing patterns, and there were effects of orientation and the elements of which a pattern was composed, as well as interactions. This research indicates that instruction on clock faces and rotating objects should precede instruction on letters and numbers, and that symmetric patterns can also be easily understood. 相似文献
20.
水稻种子贮藏蛋白分为水溶性清蛋白、醇溶性蛋白、盐溶性球蛋白和稀酸或稀碱溶性谷蛋白,其中以谷蛋白为主;水稻种子贮藏蛋白的降解与蛋白酶活性密切相关,它的降解过程受赤霉素、脱落酸、多效唑、茉莉酸甲酯等植物生长物质调控. 相似文献