Application of microsatellites from maize to teosinte and other relatives of maize   总被引：5，自引：0，他引：5  

T. Lübberstedt    C. Dussle  A. E. Melchinger 《Plant Breeding》1998,117(5):447-450

Teosinte comprises different Zea species (Zea mays, Zea diploperennis, Zea perennis, Zea luxurians) that can be crossed with cultivated maize (Z. mays ssp. mays). Nine microsatellites from maize were applied to different teosinte species in order to evaluate their usefulness in markerbased exploitation of these genetic resources. The same microsatellites were tested with rye, barley, and sorghum as potential molecular markers for these species. Almost all microsatellite × teosinte combinations yielded polymerase chain reaction (PCR) fragments in the range of cultivated maize. Using an F₂ population of a cross between maize inbred A188 and an individual of Zea mays ssp. mexicana, amplification products for maize and teosinte originated from the same genomic location for each of nine microsatellites investigated. PCR fragments of reduced intensity were generally obtained by applying maize microsatellites to rye, barley and sorghum. Polymorphisms among accessions within teosinte (sub)species occurred frequently. In contrast, no polymorphisms were obtained within rye, barley, and sorghum. Hence, application of maize microsatellites to teosinte for fingerprinting or marker-assisted introgression of genomic regions from teosinte into cultivated maize appears promising.  相似文献   

Osmotic Adjustment in Maize (Zea mays L.): Changes with Ontogeny and its Relationship with Phenotypic Stability   总被引：1，自引：0，他引：1  

J. H. Lemcoff  C. A. Chimenti  T. A. E. Davezac 《Journal of Agronomy and Crop Science》1998,180(4):241-247

Genetic variation for osmotic adjustment was examined in a group of maize hybrids during vegetative and silking stages. Estimates of osmotic adjustment were derived from measurements of leaf relative water content (RWC) and osmotic potential (Ψ o ) before day-break. The degree of adjustment was estimated from the In RWC/In Ψ o relationship. All cultivars examined showed some degree of osmotic adjustment and significant differences (P < 0.05) were found among them. The utility of measurements in early vegetative stages as a mean of selection for osmotic adjustment in silking stage was established. A positive tendency was observed between osmotic adjustment and phenotypic stability.  相似文献   

Interactive Effects of Salinity and Biological Nitrogen Fixation on Chickpea (Cicer arietinum L.) Growth     

R. Zurayk  M. Adlan  R. Baalbaki  M. C. Saxena 《Journal of Agronomy and Crop Science》1998,180(4):249-258

The effect of salinity on the nodulation, N-fixation and plant growth of selected chickpea- Rhizobium symbionts was studied- Eighteen chickpea rhizobial strains were evaluated for their growth in a broth culture at salinity levels of 0 to 20 dS m⁻¹ of NaCl + Na₂SO₄. Variability in response was high. Salinity generally reduced the lag phase and/or slowed the log phase of multiplication of Rhizobium. Nine chickpea genotypes were also evaluated for salt tolerance during germination and early seedling growth in Petri dishes at five salinity levels (0–32 dS m⁻¹). Chickpea genotypes ILC-205 and ILC-1919 were the most salt-tolerant genotypes. The selected rhizobial strains and chickpea cultivars were combined in a pot experiment aimed at investigating the interactive effect of salinity (3, 6 and 9 dS m⁻¹) and N source (symbiosis vs. inorganic N) on plant growth. Symbiotic plants were more sensitive to salinity than plants fed mineral N. Significant reductions in nodule dry weight (59.8 %) and N fixation (63.5 %) were evident even at the lowest salinity level of 3 dS m-¹. Although nodules were observed in inoculated plants grown at 6 dS m-¹, N-fixation was completely inhibited. The findings indicate that symbiosis is more salt-sensitive than both Rhizobium and the host plant, probably due to a breakdown in one of the processes involved in symbiotic-N fixation. Improvement of salinity tolerance in field grown chickpea may be achieved by application of sufficient amounts of mineral nitrogen.  相似文献   

兰旗榆——一个在干旱草原区很有发展潜力的造林树种     

阎伟  李万宝  武巧文 《内蒙古林学院学报》1997,(1)

兰旗榆为白榆的一个地理生态变种,在锡盟浑善达克沙地及其南缘的镶黄旗、正镶白旗、正兰旗等地区生长表现突出。该树种较之其它的白榆品种具有抗旱、抗寒、抗风沙,物候期早,所需积温低以及生长迅速等优良特性,对我区北部干旱草原气候生态条件适应能力强,在草原造林中有着其它树种不可替代的地位和作用,建议大力推广。  相似文献   

郁金香花芽分化的解剖学研究   总被引：3，自引：0，他引：3  

杨秋生  萧蓉萍 《河南农业大学学报》1997,31(3):251-254

利用石蜡切片法研究了郁金香花芽分化的进程及温度变化对花芽分化的影响。结果表明：郁金香鳞茎内顶端生长点的分化过程可以分为营养生长期，生殖茎端形成期，花器官分化期，花器官伸长期４个时期花芽分化从７月上旬开始，８肿旬结束。在贮藏期间，郁金香鳞茎内顶端生长点前期发育速度较慢，后期发育速度较快，并按由外向内的顺序进行。  相似文献   

水稻光温敏两系不育系15S特征特性及繁殖技术   总被引：2，自引：1，他引：1  

杨金松  张再君  邱东峰  刘春萍 《湖北农业科学》2008,47(11)

介绍了水稻光温敏两系不育系15S的形态特征和生育特性,提出了繁殖地点选择,生育期安排,培育壮秧,落地谷的处理等繁殖高产优质不育系种子的技术措施.  相似文献   

野蚕越冬卵的孵化和年发生代数的研究   总被引：8，自引：3，他引：5  

黄尔田 《蚕业科学》1985,(4)

研究证实(1980—1984年),嘉湖平原野蚕年发生三代.越冬卵始孵期为四月中旬,盛期为六月中旬.但近半个世纪以来.很多人一直误认为四月中旬发生的野蚕是第一代,六月下旬发生的为“第二代”,事实上都是越冬卵孵化的幼虫.均为第一代.经测定,四月下旬越冬卵孵化率为0.15%,5月下旬为7.9%,6日20日为91%.本区野蚕产越冬卵最的早在9月17日,高峰期在11月上旬.结束期在12月14日,越冬卵产出越早,翌年卵孵期也早,孵化的早和迟之间可相差122天.野蚕越冬卵翌年孵化期长的原因.与秋冬产卵期长及桑园生态环境复杂有关.据室内4月24日越冬卵孵化的幼虫连续饲养,到第三代卵期恰与室外第二代卵期相重叠,说明自然界发生第四代是可能的,但真正存活率在1%以下.在防治措施上,以在越冬卵孵化高峰期(6月15—20日)施用0.1%敌敌畏.防效最好.  相似文献   

Diversity of grain proteins and bread wheat quality: I. Correlation between Gliadin Bands and Flour quality characteristics     

G. Branlard  M. Dardevet 《Journal of Cereal Science》1985,3(4):329-343

  相似文献   

Conversion of the Statistical Combining Ability into a Genetic Concept   总被引：1，自引：0，他引：1  

LV Ai-zhi  ZHANG Hao  ZHANG Zu-xin  TAO Yong-sheng  YUE Bing  ZHENG Yong-lian 《中国农业科学(英文版)》2012,(1):43-52

  相似文献   

用单叶鲜重速测青贮玉米地上生物量   总被引：3，自引：2，他引：1  

王得贤 《草业科学》1997,14(2):68-70

研究了苗期（４叶期）、拔节期和灌浆期的白马牙玉米每层叶鲜重与单地上生物量（鲜重或干重的）回归方程。结果表明，按人上至下的顺序排叶序，则苗期的第２－３层叶、拔节期的第４层叶和灌浆期的第４－６层叶的叶鲜民相应生育时期的单株地上生物量呈极显著的正相关，可分别用以快速估测该生育时期的单地上生物量。  相似文献