全文获取类型
收费全文 | 24383篇 |
免费 | 1951篇 |
国内免费 | 1782篇 |
出版年
2024年 | 34篇 |
2023年 | 250篇 |
2022年 | 789篇 |
2021年 | 1277篇 |
2020年 | 883篇 |
2019年 | 1039篇 |
2018年 | 1032篇 |
2017年 | 749篇 |
2016年 | 1069篇 |
2015年 | 1468篇 |
2014年 | 1724篇 |
2013年 | 1891篇 |
2012年 | 2248篇 |
2011年 | 1925篇 |
2010年 | 1168篇 |
2009年 | 1020篇 |
2008年 | 1201篇 |
2007年 | 1064篇 |
2006年 | 922篇 |
2005年 | 809篇 |
2004年 | 695篇 |
2003年 | 628篇 |
2002年 | 544篇 |
2001年 | 481篇 |
2000年 | 417篇 |
1999年 | 405篇 |
1998年 | 255篇 |
1997年 | 269篇 |
1996年 | 256篇 |
1995年 | 242篇 |
1994年 | 220篇 |
1993年 | 136篇 |
1992年 | 206篇 |
1991年 | 145篇 |
1990年 | 130篇 |
1989年 | 109篇 |
1988年 | 73篇 |
1987年 | 94篇 |
1986年 | 56篇 |
1985年 | 56篇 |
1984年 | 43篇 |
1983年 | 30篇 |
1982年 | 30篇 |
1981年 | 19篇 |
1980年 | 8篇 |
1979年 | 6篇 |
1958年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
941.
942.
The roles of ethylene (ET) or salicylic acid (SA) in plant response to low temperature (LT, 5 °C) have been implicated. However, the combined effect of ET- and SA-signaling on plant growth and metabolism under LT remains to be evaluated. In this study, we comparatively analyzed the response of Arabidopsis ethylene insensitive (ein) 2-1 (an ET insensitive mutant), nonexprressor of pathogenesis relative (npr)1-1 (an SA insensitive mutant) and double mutant ein2-1/npr1-1 plants to LT. The results show that a LT of 5 °C induced plant growth retardation to a less degree in ein2-1, an intermediate degree in npr1-1, but a much larger in ein2-1/npr1-1 compared to the wild-type (WT) plants. The LT susceptibility of the ein2-1/npr1-1 plants was correlated to a lower net photosynthetic rate and proline content, and a higher content of H2O2 and malondialdehyde and electrolyte leakage relative to the WT plants. Lower activities of superoxide dismutase, peroxidase, and catalase, as well as a lower glutathione content and a ratio of its reduced form to its oxidized form were also observed in the double mutant plants as compared with the WT plants. However, at normal conditions (23 °C), all the tested physiological and biochemical parameters were comparable between the ein2-1/npr1-1 and WT plants, and plant growth was even better in the double mutant than in the WT plants. On the contrary, most of the above-mentioned parameters were advantageous in the ein2-1 and npr1-1 plants over the WT plants under the LT conditions. These data suggest that a parallel function or physiological redundancy of nonexpressor of pathogenesis relative 1 and ethylene insensitive 2 existed in the Arabidopsis plant response to the LT. On the other hand, an interaction between ET- and SA-signaling occurred during this process. 相似文献
943.
944.
Chun-Long Li Mei Wang Xiao-Meng Wu Dong-Hua Chen Hong-Jun Lv Jian-Lin Shen Zhu Qiao Wei Zhang 《Plant physiology》2016,170(2):1090-1104
945.
946.
947.
Weiliang Qi Yao Tang Wei Zhu Daiyan Li Chengdou Diao Lili Xu Jian Zeng Yi Wang Xing Fan Lina Sha Haiqin Zhang Youliang Zheng Yonghong Zhou Houyang Kang 《Planta》2016,244(2):405-416
Main conclusion
A new wheat-rye 1BL?1RS translocation line, with the characteristics of superior stripe rust resistance and high thousand-kernel weight and grain number per spike, was developed and identified from progenies of wheat-rye- Psathyrostachys huashanica trigeneric hybrids.Abstract
The wheat-rye 1BL?1RS translocation line from Petkus rye has contributed substantially to the world wheat production. However, due to extensive growing of cultivars with disease resistance genes from short arm of rye chromosome 1R and coevolution of pathogen virulence and host resistance, these cultivars successively lost resistance to pathogens. In this study, a new wheat-rye line K13-868, derived from the progenies of wheat-rye-Psathyrostachys huashanica trigeneric hybrids, was identified and analyzed using fluorescence in situ hybridization (FISH), genomic in situ hybridization (GISH), acid polyacrylamide gel electrophoresis (A-PAGE), and molecular markers. Cytological studies indicated that the mean chromosome configuration of K13-868 at meiosis was 2n = 42 = 0.14 I + 18.78 II (ring) + 2.15 II (rod). Sequential FISH and GISH results demonstrated that K13-868 was a compensating wheat-rye 1BL?1RS Robertsonian translocation line. Acid PAGE analysis revealed that clear specific bands of rye 1RS were expressed in K13-868. Simple sequence repeat (SSR) and rye 1RS-specific markers ω-sec-p1/ω-sec-p2 and O-SEC5′-A/O-SEC3′-R suggested that the 1BS arm of wheat had been substituted by the 1RS arm of rye. At the seedling and adult growth stage, compared with its recurrent wheat parent SM51 and six other wheat cultivars containing the 1RS arm in southwestern China, K13-868 showed high levels of resistance to stripe rust (Puccinia striiformis f. sp. tritici, Pst) pathogens prevalent in China, which are virulent to Yr10 and Yr24/Yr26. In addition, K13-868 expresses higher thousand-kernel weight and more grain number per spike than these controls in two growing seasons, suggesting that this line may carry yield-related genes of rye. This translocation line, with significant characteristics of resistance to stripe rust and high thousand-kernel weight and grain number per spike, could be utilized as a valuable germplasm for wheat improvement.948.
949.
Bo Li Bangqing Wang Hongyan Li Liang Peng Mei Ru Zongsuo Liang Xijun Yan Yonghong Zhu 《Protoplasma》2016,253(1):87-100
950.
Xiufang Liu Yunzhi Song Fangyu Xing Ning Wang Fujiang Wen Changxiang Zhu 《Protoplasma》2016,253(5):1265-1281