全文获取类型
收费全文 | 155篇 |
免费 | 9篇 |
国内免费 | 21篇 |
专业分类
农学 | 35篇 |
基础科学 | 2篇 |
2篇 | |
综合类 | 55篇 |
农作物 | 23篇 |
畜牧兽医 | 12篇 |
园艺 | 1篇 |
植物保护 | 55篇 |
出版年
2024年 | 1篇 |
2023年 | 5篇 |
2022年 | 5篇 |
2021年 | 9篇 |
2020年 | 9篇 |
2019年 | 4篇 |
2018年 | 3篇 |
2017年 | 7篇 |
2016年 | 8篇 |
2015年 | 6篇 |
2014年 | 5篇 |
2013年 | 5篇 |
2012年 | 11篇 |
2011年 | 14篇 |
2010年 | 6篇 |
2009年 | 5篇 |
2008年 | 6篇 |
2007年 | 13篇 |
2006年 | 8篇 |
2005年 | 5篇 |
2004年 | 9篇 |
2003年 | 5篇 |
2002年 | 6篇 |
2000年 | 5篇 |
1997年 | 3篇 |
1996年 | 1篇 |
1995年 | 4篇 |
1993年 | 1篇 |
1992年 | 4篇 |
1991年 | 6篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1982年 | 1篇 |
1955年 | 1篇 |
排序方式: 共有185条查询结果,搜索用时 265 毫秒
81.
麦根腐平脐蠕孢菌[Bipolaris sorokiniana(Sacc.)Shoemaker]引起的叶斑病是大麦上重要的病害叶部之一,在世界各大麦主要种植区均能造成严重的经济损失。本研究利用3个致病力不同的蠕孢叶斑病菌株Z 12010、Z 12014和Z 13010分别对来源于中国及国外引进的61份大麦种质资源进行苗期抗蠕孢菌叶斑病鉴定,田间接种Z 12014菌株进行成株期抗病性鉴定。在所鉴定的大麦种质中未发现在苗期或成株期对叶斑病免疫的材料。苗期抗叶斑病分析发现,品种之间对3个菌株的抗性存在明显差异,Varunda、Legacy、Tradition、09GW-01、09GW-07、08PJ-36、09PJ-39、垦啤麦7号、垦啤麦10号、驻大麦3号、S-4和中饲麦1号等12份材料对3个菌株表现为中抗至高抗反应型。7份材料成株期抗Z 12014菌株,其中Legacy、蒙啤麦3号、09PJ-39、垦啤麦9号、垦啤麦11号和龙啤麦3号等6份材料具有全生育期抗性特点,品种10-3苗期对菌株Z 12014感病,而成株期抗该菌株。 相似文献
82.
83.
薏苡叶枯病和叶斑病调查与病原鉴定 总被引:1,自引:0,他引:1
对福建省龙岩市新罗区薏苡叶部病害进行了调查。用组织分离法,PSA平板培养经纯化后作病原鉴定,在其上发现了两种病害:薏苡叶斑病为一种新病害,病原鉴定为薏苡尾孢(Cercospora sp.);薏苡叶枯病为福建省首次记录,其病原为薏苡平脐蠕孢(Bipolaris coicis)。 相似文献
84.
Wheat (Triticum aestivum L.) cultivars for the warm regions of South Asia must produce high yields and possess resistance to spot blotch (Cochliobolus sativus), early maturity and high kernel weight. A study was conducted to determine the effectiveness of selecting for high grain yield based on a selection index for spot blotch resistance, maturity and kernel weight in four wheat crosses involving a susceptible cultivar and resistant genotypes. Initial selection of 40 progeny lines in each cross had been made using a selection index based on disease severity, days to heading and kernel weight as reported by Sharma and Duveiller [{Crop Sci 43 (2003) 2031}]. The five highest grain-yielding progeny lines from among the 40 lines in each cross, their parents and five popular commercial cultivars were evaluated in field trials at two sites in Nepal in the 2002 and 2003 wheat seasons. Multiple spot blotch assessments were made to determine the area under disease progress curve (AUDPC). Grain yield, thousand-kernel weight (TKW), days to heading and plant height were examined. The wheat genotypes in the farmer's field were also ranked on the basis of cultivar preference criteria by the local farmers. The 20 progeny lines always showed a higher (+11 to +125%) grain yield and heavier (+10 to +44%) kernels than their parents and a lower (−83 to −89%) AUDPC than the susceptible parent. The progeny lines showed 98–100% grain yield, 97–100% TKW and 66–78% AUDPC compared to the highest grain-yielding commercial cultivar. Based on the farmers' preference criteria for a desirable wheat genotype, the best progeny lines ranked from 3rd to 5th, whereas the two commercial cultivars ranked 1st (Gautam) and 2nd (BL 1473). Results indicated that selection was effective in combining adaptation genes present in a local cultivar with some level of tolerance to spot blotch and resistance genes from exotic genotypes, which translated into improved agronomic performance and disease resistance. The selection index and farmer participatory approach used in this study could serve as a guideline in breeding efforts targeted for high yielding genotypes for wheat-growing conditions in South Asia where spot blotch is a serious biotic constraint to yield. 相似文献
85.
Summary Ten inbred lines from the open-pollinated maize variety Jarvis were selected from 51 randomly collected lines to represent a wide range of susceptibility to one isolate each of Bipolaris maydis or Colletotrichum graminicola. Ten isolates of each pathogen were selected for a range of virulence on a maize line with average resistance. Resistance and virulence ratings were based on lengths of lesions that developed on leaves of greenhouse-grown seedlings inoculated with 5 l droplets of suspensions of known spore concentrations. For each disease the ten maize lines were inoculated in all possible combinations with the ten pathogen isolates. The experiment was run six times with each pathogen. Analysis of variance for individual trials indicated a significant interaction between maize lines and B. maydis isolates in all six trials and between maize lines and C. graminicola isolates in four of six trials. For both diseases. the combined analysis over all six trials revealed no significant interaction. Apparently the expression of specificity in these host-pathogen interactions is variable. 相似文献
86.
Stay green trait: variation, inheritance and its association with spot blotch resistance in spring wheat (Triticum
aestivum L.) 总被引:2,自引:0,他引:2
A. K. Joshi M. Kumari V. P. Singh C. M. Reddy S. Kumar J. Rane R. Chand 《Euphytica》2007,153(1-2):59-71
One thousand four hundred and seven spring wheat germplasm lines belonging to Indian and CIMMYT wheat programs were evaluated
for stay green (SG) trait and resistance to spot blotch caused by Bipolaris
sorokiniana during three consecutive crop seasons, 1999–2000, 2000–2001 and 2001–2002. Disease severity was recorded at six different
growth stages beginning from tillering to late milk stage. SG trait was measured by following two approaches: difference for
0–9 scoring of green coloration (chlorophyll) of flag leaf and spike at the late dough stage (GS 87) and a new approach of
leaf area under greenness (LAUG). Germplasm lines showed a wide range (7–89) for LAUG and were grouped into four viz., SG,
moderately stay green, moderately non-stay green and non-stay green (NSG). However, very few (2.2%) lines showed high expression
of SG trait, i.e., LAUG >60. LAUG appeared to be a better measure of SG trait than a 0–9 scale. Mean spot blotch ratings of
SG genotypes were significantly lower than those of NSG genotypes at all growth stages. Two spot blotch resistant genotypes
(Chirya 3 and Chirya 7) having strong expressions of SG trait were crossed with NSG, spot blotch susceptible cv. Sonalika.
Individually threshed F2 plants were used to advance the generations. SG trait and spot blotch severity were recorded in the parents and F1, F3, F4, F5, F6 and F6–7 generations under disease-protected and inoculated conditions. SG trait in the F1 generation was intermediate and showed absence of dominance. Evaluation of progenies (202–207) in the segregating generations
revealed that SG trait was under the control of around four additive genes. Lines homozygous for SG trait in F4, F5, F6 and F6–7 generations showed significantly lower mean area under disease progress curve (AUDPC) for spot blotch than those with NSG
expression. A positive correlation (0.73) between SG trait and AUDPC further indicated a positive influence of SG on severity
of spot blotch. The study established that variation for SG trait exists in spring wheat; around four additive genes control
its inheritance in the crosses studied and there is positive association between SG trait and resistance to spot blotch. 相似文献
87.
用可溶性蛋白电泳法鉴定玉米小斑病菌生理小种 总被引:2,自引:0,他引:2
分别从玉米小斑病菌T、C、O三个生理小种的菌丝中提取可溶性蛋白,进行聚丙烯酰胺凝胶电泳(PAGE)和SDS聚丙烯酰胺凝胶电泳(SDS-PAGE),经多次比较试验,T、C、O小种的蛋白质图谱主带基本相同,个别带存在一定差异,而同一生理小种不同菌株间差异甚小.建议运用病原菌蛋白电泳的方法,作为小种分类、病害预测的手段之一. 相似文献
88.
Recessive genes controlling resistance to Helminthosporium leaf blight in synthetic hexaploid wheat 总被引:1,自引:0,他引:1
A study was conducted under controlled environment conditions in a phytotron to determine the nature of the inheritance of resistance Helminthosporium leaf blight (HLB) in a synthetic hexaploid wheat line, ‘Chirya‐3’, against the isolate KL‐8 of Bipolaris sorokiniana from the major wheat growing region of India. Crosses were made between two susceptible lines ‘WH 147’ and ‘Chinese Spring’. Analyses of F1 and F2 populations of these two crosses (‘WH 147’בChirya‐3’ and ‘Chinese Spring’בChirya‐3’) showed that resistance against the isolate in ‘Chirya‐3’ was governed by two recessive genes functioning in a complementary interaction giving an F2 segregation pattern of 1 : 15 (resistant : susceptible). The segregation pattern of the resistant F2 progenies in F3 families from both crosses confirmed that two homozygous recessive genes were responsible for resistance to the isolate of Bipolaris sorokiniana in the synthetic line ‘Chirya‐3’. It is proposed that the genes be designated as hlbr1 and hlbr2. 相似文献
89.
3种牧草根际平脐蠕孢形态和生物学特性 总被引:4,自引:3,他引:1
自甘肃环县沟壑草地牧草根部常规组织分离获得特异平脐蠕孢、高粱平脐蠕孢和麦根腐平脐蠕孢,并对其生物学特性进行了研究。结果表明,3种平脐蠕孢在生物学特性上有明显差异,特异平脐蠕孢孢子萌发的温限为5~45℃,最适萌发温度为35℃,在45℃时萌发率仍高达85.1%;高粱平脐蠕孢孢子的萌发温限为5~40℃,最适萌发温度为15~30℃;麦根腐平脐蠕孢孢子的萌发温限为5~45℃,最适温度15~25℃,在45℃时萌发率仅为2.3%;不同pH值时特异平脐蠕孢孢子萌发率均较后2种高,且前者孢子萌发的最适pH值为5.59~6.47,后两者pH值均为6.47;土壤液等4种营养液对特异平脐蠕孢孢子萌发率在4h后有促进作用,对高粱平脐蠕孢在最初2h有促进作用,而对麦根腐平脐蠕孢则有抑制作用;3种菌萌发均需要液态水,但对光不敏感。 相似文献
90.