中棉所29栽培技术及其生理特性研究   总被引：5，自引：2，他引：5  

毛树春  韩迎春  宋美珍  张朝军  范正义 《棉花学报》2001,13(2):82-86

研究表明 ,抗虫杂交棉中棉所 2 9苗期叶绿素、IAA含量高 ,MDA含量低 ,SOD、CAT酶活性高 ,膜脂过氧化程度低 ,棉苗抗胁迫能力强 ,苗质好 ,生长健壮 ;中后期 MDA、ABA含量和 POD活性升高 ;整个生育期均保持较高的光合强度 ,N素营养充足 ,利于高产优质 ;在华北平原一熟种植最佳播期在 4月下旬 ,中等肥水条件下最佳密度为 5.2 5万株· hm- 2 ;对缩节安化调反应不敏感 ,应看苗化调  相似文献   

Simplified culture method of detached ears and its application to vernalization in wheat   总被引：3，自引：0，他引：3  

K. Kato  S. Tomo  S. Yamazaki  K. Hayashi 《Euphytica》1990,49(2):161-168

Summary The effects of the addition of sulfurous acid into culture solution and of cold treatment of the solution were examined to simplify the culture of detached wheat ears. In the simplified method, detached ears could be cultured at room temperature on the liquid medium containing 100 g/l sucrose and 0.075% sulfurous acid without any sterilization. The immature seeds in detached ears cultured by this method were treated with low temperature or with chemicals known to have vernalizing effect. The chemical treatment did not affect the chilling requirement of immature embryos, although photoperiodic response and narrow-sense earliness were reduced by kinetin and trypsin. The low temperature treatment drastically affected the chilling requirement, and fully vernalized mature seeds having normal germinability were obtained by treating the detached ears in culture with low temperature from 10 days after anthesis.  相似文献   

陆地棉早熟性遗传研究进展   总被引：7，自引：3，他引：7  

《棉花学报》1994,(1)

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Genetic linkage of QTLs for late blight resistance and foliage maturity type in six related potato progenies     

M. H. P. W. Visker  H. J. B. Heilersig  L. P. Kodde  W. E. Van de Weg  R. E. Voorrips  P. C. Struik  L. T. Colon 《Euphytica》2005,143(1-2):189-199

A set of test crosses of diploid potatoes was used to identify QTLs for foliage resistance against Phytophthora infestans and QTLs for foliage maturity type, and to assess their genetic relationship. The most important locus for both traits was found on chromosome 5 near marker GP21: the allele of marker GP21 that is associated with resistance to late blight is also associated with late foliage maturity. An additional QTL with a small effect on foliage maturity type was identified on chromosome 3, and additional QTLs for late blight resistance were found on chromosomes 3 and 10. Another QTL was detected on chromosome 7 when resistance was adjusted for the effect of foliage maturity type. The additional QTLs for resistance against P. infestans on chromosomes 3 and 10 seem to be independent of foliage maturity type and are not affected by epistatic effects of the locus on chromosome 5. The effects of the additional QTLs for resistance are small, but early maturing genotypes that necessarily have the allele for susceptibility for late blight on chromosome 5 may benefit from the resistance that is provided by these QTLs on chromosomes 3 and 10.  相似文献   

Effect of inbreeding on horticultural performance of lines developed from an open-pollinated pickling cucumber population     

David B. Rubino  Todd C. Wehner 《Euphytica》1986,35(2):459-464

Summary The effect of self-pollination of cucumber (Cucumis sativus L.) for 6 generations in lines developed from the North Carolina Medium Base Pickle population was determined by regression of trait expression for each generation on Wright's coefficient of inbreeding. Two yield traits (total and marketable), earliness and 3 fruit quality traits (shape, color and seedcell size) were evaluated in 2 environments (spring and summer, 1983). The regression did not result in significant negative slopes, indicating that inbreeding depression was not important in the population for the traits studied. Midparent heterosis was found for most traits in many hybrids obtained from crossing S₆ lines with the gynoecious inbred line, Gy 14A.  相似文献   

Effect of Water Stress on the Yield of Cowpea (Vigna unguiculata L. Walp.) Genotypes in the Delmarva Region of the United States     

R. B. Dadson  F. M. Hashem  I. Javaid  J. Joshi  A. L. Allen  T. E. Devine 《Journal of Agronomy and Crop Science》2005,191(3):210-217

Drought is an important yield-reducing factor for corn and soya bean which are the two major crops in the Delaware, Maryland and Virginia (Delmarva) region of the United States. Cowpea (Vigna unguiculata L. Walp.) is primarily grown in drier regions of the world where it is one of the most drought-resistant food legumes. Field experiments were conducted in which 10 genetically diverse cowpea genotypes were evaluated for adaptability to the Delmarva area. The cowpea genotypes were grown in rain-out shelters under non-water-stressed and water-stressed conditions. The results showed that under non-water-stressed conditions cowpea genotypes California Blackeye 5, Champion and Mississippi Silver gave higher seed yields, while genotypes White Acre, Six Week Browneye and Texas Cream 8 provided lower seed yields. Genotypes California Blackeye 5 and Champion gave comparatively better seed yields under water-stressed conditions. California Blackeye 5 was the highest seed-yielding genotype under both water-stressed and non-water-stressed conditions. The highest biological yield under non-water-stressed conditions was given by genotypes Two Crop Brown, White Acre and Elite, whereas under the water-stressed condition genotypes Texas Cream 8, California Blackeye 5, and Mississippi Silver gave higher biological yield. Genotypes Quickpick Pinkeye and Elite were identified as early maturing genotypes. The harvest index (HI) varied significantly among genotypes, with Texas Cream 8 having the lowest HI. Cowpea genotypes which gave higher seed yield under water-stressed conditions could play an important role in sustaining crop production in the Delmarva region.  相似文献   

Identification and Gene Mapping of Completely Dominant Earliness in Rice   总被引：2，自引：0，他引：2  

DENG Xiao-jian  ZHOU Kai-da  LI Ren-duan  CHUN Ze  LI Ping  WANG Wen-Ming  ZHAI Wen-Xue  ZHU Li-Huang 《中国农业科学(英文版)》2002,1(1):11-18

The completely dominant earliness was identified in a genic male-sterile and early maturing indica line 6442S-7. F1 progenies from 6442S-7 crossed with thirteen various types of medium- or latematuring varieties, shared the same heading date as 6442S-7. The segregation of heading date in the F2 and B1F1 populations showed that the earliness of 6442S-7 is mainly controlled by two dominant major genes. The local linkage map of one dominant earliness gene harbored in 6442S-7 was constructed with F2 population and four kinds of molecular marker techniques. The results showed that the gene was located between a RFLPmarker C515 and a RAPD marker OPI 11. 557 on the terminal region of short arm of rice chromosome 3,10.9cM and 1.5 cM from C515 and OPI11. 557, respectively. The genetic distances from the target gene to twoSSR markers, RM22 and RM231, and one AFLP marker, PT671, were 3.0, 6.7 and 12.4 cM, respectively. This gene, being identified and mapped first, is designated tentatively as Ef-cd (t). As a new genetic resource of completely dominant earliness, 6442S-7 has splendid future in rice improvement.  相似文献   

Dynamic climate control; an optimization study for earliness of cucumber production     

A.H.C.M. Schapendonk  H. Challa  P.W. Broekharst  A.J. Udink Ten Cate 《Scientia Horticulturae》1984,23(2):137-150

The culture of a cucumber crop can be divided into two stages: growth of young plants until flowering, and fruit production. The first stage should be as short as possible to minimize the costs during the vegetative phase. In the present study, a simple optimization model was tested. The model quantifies the instantaneous effect of environmental factors on earliness of production using the number of leaves as a characteristic parameter related to the onset of the production stage. The temperature in the glasshouse was optimized by maximizing the difference between the rate of economic production and the rate of energy consumption.In a glasshouse experiment, it appeared that effects of light and temperature on the leaf unfolding process differ. Whereas the leaf unfolding rate responds rapidly to a change in temperature, changes of light intensity give rise to a considerably delayed response. The effect of light intensity during the time prior to planting appears to be of significant importance to the leaf unfolding rate in the subsequent period from planting until flowering.  相似文献   

Genetic Analysis of Earliness Trails in Short Season Cotton （Gossypium hirsutum L.）     

SONG  Mei-zhen FAN  Shu-li YUAN  Ri-hong PANG  Chao-you YU  Shu-xun 《中国农业科学(英文版)》2012,(12):1968-1975

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Ten consecutive years of regulated deficit irrigation probe the sustainability and profitability of this water saving strategy in loquat     

Juan J. Hueso 《Agricultural Water Management》2010,97(5):645-650

The successful application of postharvest regulated deficit irrigation (RDI) over ten consecutive years (from season 1999/2000 to season 2007/2008) confirms the sustainability of this strategy for producing ‘Algerie’ loquat. Postharvest RDI consisting in a reduction of watering (between 45 and 80% depending on the season) from early June until the end of August, improved loquat profitability by increasing fruit value and by reducing water consumption with respect to fully irrigated trees (control). The increase in fruit value in RDI trees was due to a consistent improvement in harvest earliness as a result of an earlier blooming. Water savings of around 20% did not diminish yield nor fruit quality. Water use efficiency in RDI trees rose by over 30%. Water productivity reached 9.5 € m⁻³ of water applied in RDI trees versus 6.6 € m⁻³ in control trees. The most noticeable effect of RDI on vegetative growth was a significant and progressive decline in trunk growth. The canopy volume seems to be strongly influenced by pruning and no significant effects were detected in this parameter. Our results confirm the suitability of RDI in loquat and the economic benefits of saving water during the summer.  相似文献