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1.
DONGFenggao ZHUXuedong XIONGZhenmin 《中国水稻研究通报》1995,3(1):1-2
The development of photo-thermo period sensitive genie male sterile (PGMS) rice, which exhibits male sterility in summer but normal fertility in autumn, has provided an opportunity to simplify the breeding and seed production of hybrid rice. However,as the conversion of fertility of PGMS indica rice is affected by unusual low temperature in summer, it will part 相似文献
2.
《中国水稻研究通报》1996,(3)
F_3 lines from Nonglin 20×Dongnong 415 were used for genetic analysis of blast resistance in japonica rice varieties. One hundred and eighteen lines from F_3 were randomly selected and 17 seeds from each line were sown in plots. Two plots were set corresponding to two 相似文献
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《中国水稻研究通报》1995,(1)
Cytoembryological studies were employed to reveal the origin of haploid and to determine the cytological facters relating to the production of diploid polyembryony within one embryo sac occuring in natural population of a polyembryonic line SB- 1 of O. sativa L. The results showed that one or both synergids may develop into embryos prior to fertilization with frequencies of 2.24% and 1.75% in observed ovaries, respectively. The double fertilization was observed in embryo sacs with one previously-deve-loped multicellular synergid embryo. In caryopsis 3-8 d after anthesis, 1.62% abnormal slender embryos, which are morphologically different from zygotic embryos, were present between the endosperm 相似文献
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QIANQian XIONGZhenming MINShaokai ZHULihuang 《中国水稻研究通报》1996,4(3):1-1
Lipid content of rice grain was lower than that of corn and other oil crops, but it was rich in the content of unsaturated lopacid. As all the lipid was stored in embryo, one of the promising way to raise its content is to increase the embryo size. Genetic etidies on giant embryo was therefore of great importance. In this experiment, Kinmaze, a japonica giant embryo mutant derived from Japan, and an indica variety Nanjing 11 were used as parents to construct a F_2 population of 58 plants. In combination with eight restriction enzymes (EcoR Ⅰ, EcoR Ⅴ, Dra Ⅰ, Xba Ⅰ, Hind Ⅲ, BamH Ⅰ, Bgl Ⅱ, andSca Ⅰ), 262 DNA clones were used to detect the RFLP's of the parents, of which 73.2% detected polymorphism between the two parents. Seventy-four polymorphism clones were used to analyze the RFLP's of 58 F_2 individuals. Linkage analysis was then performed with the computer package MAPMAKER (Lander et al, 1987). Twelve linkage groups were constructed, among which RFLP markers RG678 and RE395 on chromo 相似文献
8.
LIXin GUMinghong CHENGZhukuan YUHengxia 《中国水稻研究通报》1996,4(2):5-6
Scented or aromatic rice (Oryza sativa L.) is highly valued in many areas of the world. The development of high yielding scented cultivars has been limited because of lacking information on the inheritance of scent such as linkage of genes for aroma with other genes. We report here our studies on the determination of the chromosomal location of an aroma gene. Twenty-nine marker stocks, including 14 相似文献
9.
The newly developed hybrid rice combination “Xieyou 9308“ (Xieqingzao A/T9308) has been regarded as a super-high-yielding rice variety, of which the yield potential reached as high as 12 t/ha. However, its high shattering characteristic (as high as 60%) has limited its wider application. In the current experiment, a non-shattering mutant line, M9308, was developed from T9308 by gamma irradiation. Comparisons were made but no marked differences were found between T9308 and M9308 as well as between their F1 hybrids crossed to Xieqingzao A for major agronomic and grain quality characters as well as resistance to diseases. Genetic analysis indicated that the non-shattering character of M9308 was governed by a single recessive gene. 相似文献
10.
SHENSheng-quan CHENSheng-guang WUDian-xing XIAYing-wu SHUQing-yao 《水稻科学》2004,11(4):222-224
The newly developed hybrid rice combination "Xieyou 9308" (Xieqingzao A/T9308) has been regarded as a super-high-yielding rice variety, of which the yield potential reached as high as 12 t/ha. However, its high shattering characteristic (as high as 60%) has limited its wider application. In the current experiment, a non-shattering mutant line, M9308, was developed from T9308 by gamma irradiation. Comparisons were made but no marked differences were found between T9308 and M9308 as well as between their F1 hybrids crossed to Xieqingzao A for major agronomic and grain quality characters as well as resistance to diseases. Genetic analysis indicated that the non-shattering character of M9308 was governed by a single recessive gene. 相似文献
11.
A 21-day laboratory incubation experiment was conducted to investigate the impact of pesticides (Triazophos, Butaehlor and Jinggangmycin) on a paddy field soil health under controlled moisture (flooded soil) and temperature (25℃ ) conditions. The electron transport system (ETS)/dehydrogenase activity displayed a negative correlation with pesticides concentrations, and the activity was affected adversely as the concentration of the pesticides increased. The higher doses of pesticides,5 and 10 folds field rates, significantly inhibited ETS activity, while lower rates failed to produce any significant reducing effect against the control. The relative toxicity level of pesticides in decreasing the ETS activity was in the following order:Triazophos＞Jinggangmycin＞Butachlor, irrespective of their rates of application. The pesticides caused an improvement in the soil phenol content and it increased with increasing the concentration of agrochemicals. The pesticide incorporation did not produce any significant change in soil protein content. The response of biomass phospholipid content was nearly similar to ETS activity. The phospholipid content was decreased with the addition of pesticides in the given order of Triazophos＞Jinggangmycin＞Butachlor; and the toxicity was in the order: 10 FR (times of field rate)＞5 FR＞1.0 FR＞0.5 FR＞control. 相似文献
12.
LUJun ZHUANGJieyun LINHongxuan ZHENGKangle 《中国水稻研究通报》1994,2(4):2-3
Marker-aided selection has received more attention in recent years. This relies on the exploitation of close linkage between molecular markers and target gene(s). We report here a randomly amplified polymorphic DNA (RAID) marker tightly linked to the blast resistance gene Pi-11(t) derived from Hongjiaozhan, which confers the resistante to race ZBI of Pyricularia oryzae Car. 相似文献
13.
Morphology and inheritance of a new rice leaf death mutant 总被引：4，自引：0，他引：4
CHENGZhakuan GUMingkang 《中国水稻研究通报》1998,6(3):2-2
A new mutant showing successive leaf death was selected in a mutmion populalion from an indica rice variety Zhongxian 3037 trealed with 94^Co-γ rays. The leaves of this rnutanl began lodie on the emergence of tlle third leaf tip, and all leaves died sooner alter flowering. Consequently, 相似文献
14.
Irrigation projects with reservoirs have contributed to the stabilization of traditional rainfed rice and to the introduction of double-rice in monsoon Asia. This type of irrigation also has the capability of shifting the traditional rice-cropping season. This paper discusses the influences of the shifted cropping season on water resources and the effective use of the reservoir in the Ngamoeyeik Irrigation Project Area in Lower Myanmar. Synthesized streamflow data were applied to simulate water storage in the reservoir. The main results are as follows: (1) shifting the cropping season to avoid inundation problems can increase water availability, (2) the amount of evaporation loss in the reservoir water budget can be as high as 16%, which decreases water efficiency in the reservoir operation during the dry season, (3) a shifted cropping season is preferable under the special hydrological conditions found in Lower Myanmar. 相似文献
15.
QURongda BeachyRogerN. HODuvieTH 《中国水稻研究通报》1996,4(2):1-2
A cDNA clone encoding an ABA-responsive protein HVA1, was isolated by differential screening from barley aleurone layers (Hong et al.), Expression of the HVA1 gene is shown to be developmentally regulated, organ specif ic, and ABA and stress-induced (Hong et al.). Transgenlc tobacco plants constitutively expressing HVA1 protein displayed a 4-day delay of leave wilting under drought conditions and a lower water content threshcdd (39% vs 47.6%) at the time point of first wilting. These data indicate that HVA1 protein may play a role in plant tolerance to drought 相似文献
16.
《Field Crops Research》1999,63(3):199-210
The breeding of triticale (×Triticosecale Wittmack) is of great importance in those Mediterranean environments where low winter temperature and soil acidity interact with drought, increasing the adaptability of this species in comparison with other temperate cereals. In order to identify the way in which the various yield components contribute to the realisation of high yields in a Mediterranean environment, and the effect of a different phenology on these patterns, a two-year trial was carried out in Sardinia (Italy) with 271 pure lines grown under rainfed conditions. The relationships between characters were assessed by phenotypic correlation analysis after grouping the lines into phenological classes. In both years total biomass explained more of the variation in yield than harvest index and was little affected by earliness. Both total biomass and HI were strongly correlated with kernels m−2. More kernels m−2 are therefore essential to obtain high grain yields in triticale, regardless of earliness, highlighting the importance of the pre-anthesis period, even in conditions of increasing drought stress during spring. Grain yield showed a closer correlation with HI in the less favourable year, but became independent of HI above values of 20–25,000 kernels m−2 and HI values of 0.35. The winter types were taller, with less spikes m−2, and a longer and more fertile spike than the spring types. 相似文献
17.
WU SHUQingyao XIAYingwu 《中国水稻研究通报》1998,6(4):5-5
W25 is a low-temperature sensitive albino mutant line, Temperature not only controls the albino phenotype expression of W2o, but also determines whether it could survive, When the temperature is lower than 25℃. the leaves of W25 shows complete albino, but they exhibits normal green when temperature is higher than 30℃ 相似文献
18.
《中国水稻研究通报》1999,(2)
Rice bacterial blight（BB）resistance has been amajor target in rice breeding programs.How-ever,the result of resistance identificationwith traditional method is easily affected byenvironmental factors.This problem would besolved through marker assisted selection.Sofar,most of the known BB resistance genes,such as Xa-1,Xa-2,Xa-3,Xa-4,xa-5,Xa- 相似文献
19.
Kwaku Kyeremeh Kojo Sekyi Acquah Anil Sazak Wael Houssen Jioji Tabudravu Hai Deng Marcel Jaspars 《Marine drugs》2014,12(2):999-1012
A new actinomycete strain Micromonospora sp. K310 was isolated from Ghanaian mangrove river sediment. Spectroscopy-guided fractionation led to the isolation of two new compounds from the fermentation culture. One of the compounds is butremycin (2) which is the (3-hydroxyl) derivative of the known Streptomyces metabolite ikarugamycin (1) and the other compound is a protonated aromatic tautomer of 5′-methylthioinosine (MTI) (3). Both new compounds were characterized by 1D, 2D NMR and MS data. Butremycin (2) displayed weak antibacterial activity against Gram-positive S. aureus ATCC 25923, the Gram-negative E. coli ATCC 25922 and a panel of clinical isolates of methicillin-resistant S. aureus (MRSA) strains while 3 did not show any antibacterial activity against these microbes. 相似文献
20.
WU Cheng LI Xiu-lan DENG Xiao-jian WANG Ping-rong LI Ren-duan YANG Zhi-rong 《中国水稻科学》2003,11(1-2):11-11
The plant material used in the study was rice line 162d, a new small grain dwarf mutant. Polymorphic analysis of 221 SSR loci demonstrated that 162d derived from a semidwarf variety Shuhui 162 through mutation, and 162d and Shuhui 162 were just a pair of near isogenic lines. Genetic analysis of F1 and F2 populations suggested that dwarfism in 162d was controlled by a single recessive gene. phenotypic characteristics of the mutant gene were that plant height was about a quarter of normal height, grain size about a quarter of normal size, leaf was short and broad, and seed setting rate was very low, compared with the near isogenic line Shuhui 162. The mutant gene was sensitive to gibberellin (GA3) treatment and did not located on the region near the centromere of rice chromosome 5, where d1 gene located. Therefore, it was concluded that the mutant gene of 162d was a new small grain dwarf gene in rice. 相似文献