Cold tolerance in beans (Phaseolus spp.) as analyzed by their exotherms     

R. Holubowicz  M. H. Dickson 《Euphytica》1989,41(1-2):31-37

Summary Cold tolerance of common bean (Phaseolus vulgaris L.), runner bean (P. coccineus L.) and several bean lines was evaluated under artificial conditions. Seedlings were exposed to –6°C gradually, then to –12°C rapidly in the growth chamber with copper-constantan thermocouples attached to various parts of the plant. Seedling freezing curves with exotherms were then analyzed. Three basic parameters were measured: time required for exotherm to appear, temperature of the appearance of the exotherm and temperature rise caused by the exotherm. Exotherm appearance in beans was related to freezing injury and death of the seedlings. Exotherms of the common bean variety Bush Blue Lake 92 seedling recorded at the stem, primary leaf base, tip and petiole and true leaf appeared at the same time, however their shape was different. Exotherms of stem appeared at higher temperature than those of primary leaves. Their shapes always followed the same pattern. Beans with cold tolerance were found to produce exotherms later than susceptible ones. Exposing 3 weeks old bean seedlings to 12°C delayed the time of exotherm appearance in the cold susceptible cultivar Bush Blue Lake 92. Some plants survived 2 hours exposure to –6°C in the growth chamber.  相似文献   

我国农业工程科技创新与农业产业化   总被引：12，自引：8，他引：12       下载免费PDF全文

朱明 《农业工程学报》2003,19(1):7-10

进一步明确农业工程在我国农业发展新阶段的作用和任务，以促使农业工程在农业现代化建设中充分发挥作用。该文在分析我国农业发展新阶段的形式、特点及面临的问题的基础上，进一步分析了我国农业产业化的特点及内涵，农业工程的任务、特点及研究领域，农业工程科技与农业产业化的关系，介绍了农业工程科技在我国的应用与发展状况，提出了加快农业工程科技创新，促进我国农业产业化发展的对策与建议。  相似文献   

QTL analysis of photoperiod sensitivity in common buckwheat by using markers for expressed sequence tags and photoperiod-sensitivity candidate genes     

Takashi Hara  Hiroyoshi Iwata  Kazutoshi Okuno  Katsuhiro Matsui  Ryo Ohsawa 《Breeding Science》2011,61(4):394-404

Photoperiod sensitivity is an important trait related to crop adaptation and ecological breeding in common buckwheat (Fagopyrum esculentum Moench). Although photoperiod sensitivity in this species is thought to be controlled by quantitative trait loci (QTLs), no genes or regions related to photoperiod sensitivity had been identified until now. Here, we identified QTLs controlling photoperiod sensitivity by QTL analysis in a segregating F₄ population (n = 100) derived from a cross of two autogamous lines, 02AL113(Kyukei SC2)LH.self and C0408-0 RP. The F₄ progenies were genotyped with three markers for photoperiod-sensitivity candidate genes, which were identified based on homology to photoperiod-sensitivity genes in Arabidopsis and 76 expressed sequence tag markers. Among the three photoperiod-sensitivity candidate genes (FeCCA1, FeELF3 and FeCOL3) identified in common buckwheat, FeELF3 was associated with photoperiod sensitivity. Two EST regions, Fest_L0606_4 and Fest_L0337_6, were associated with photoperiod sensitivity and explained 20.0% and 14.2% of the phenotypic variation, respectively. For both EST regions, the allele from 02AL113(Kyukei SC2)LH.self led to early flowering. An epistatic interaction was also confirmed between Fest_L0606_4 and Fest_L0337_6. These results demonstrate that photoperiod sensitivity in common buckwheat is controlled by a pathway consisting of photoperiod-sensitivity candidate genes as well as multiple gene action.  相似文献   

干旱半干旱地区径流林业研究进展   总被引：1，自引：0，他引：1       下载免费PDF全文

吴淑芳  冯浩  吴普物 《西北农林科技大学学报(自然科学版)》2007,35(4):150-154

在径流林业理论的基础上,对干旱半干旱地区抗旱造林中高效集水技术及土壤蓄水保墒技术的研究现状进行了综述,分析了集水造林技术中存在的问题,最后对集水造林技术的发展方向进行了展望。  相似文献   

碧流河水库鲤和鲫生长特性及其利用的研究   总被引：3，自引：0，他引：3  

梁兆川  杨书葳  吴连秋  赵德树  邹波 《大连水产学院学报》1993,(Z1)

本文研究分析了碧流河水库鲤和鲫的生长特性。用臀鳍第3根鳍条(假硬刺)作为鉴定年龄的材料优于鳞片。鳞片与之年轮比较,其吻合率:鲤4年轮组为81.8％,5年轮组为50％,6年轮组仅33.30/;鲫4年轮组为75％,5年轮组为28.6％,6年轮组下降为11.1％,7年轮组完全不一致。体长(L)与鳍条半径(R)增长呈指数关系,鲤L=0.5833R~(0.8716),鲫L=1.1965R~(0.6744)。鲤和鲫渐近体长分别为71.47cm和30.14 cm,渐近体重为7410.2 g和815.79 g。拐点年龄鲤t=6.15龄,鲫t=5.19龄。底栖动物现存量为1.62 g/m~2,鱼产潜力为8.1 kg/hm~2。鉴于水库春季水位仍将呈下降趋势,为维持和提高种群数量,必须注意其苗种的人工投放。  相似文献   

饲养水平和遗传特性对XX;mas-1/mas-+鲤鱼(Cyprinus carpio L.)性别决定的影响     

张东鸣  J.Komen  C.J.J.Richter  陈颖 《吉林农业大学学报》2002,24(3):96-101

饲养水平对E4×E5 (XX ;mas- +/mas- +×XX ;mas- 1/mas - 1)鲤鱼 (CyprinuscarpioL )F1代的性别决定有显著影响 ,高饲养水平和低饲养水平处理组中雌性比率分别为 5 1 5 %和 4 1%。遗传特性对E4 5×E5 (XX ;mas- 1/mas - +×XX ;mas- 1/mas- 1)F1代的影响比饲养水平的影响显著 ,在 2个处理组中只发现 1～ 2尾雌性。 2个饲养水平对E4×E4 5 (XX ;mas- +/mas- +×XX ;mas- 1/mas - +)F1代的影响差异显著 ,高饲养水平 2个处理组中雌性比率分别为 86 2 %和 76 8% ,而低饲养水平 2个处理组中雌性比率分别为 76 8%和 5 7 9% ,高饲养水平处理组的雌性比率与低饲养水平处理 1组 (雌性比率 5 7 9% )相比差异显著。 2个饲养水平条件下E4×E5和E4×E4 5后代的XX ;mas - 1/mas - +鲤鱼性别转化率之间没有显著差异。  相似文献   

鲤鱼红细胞电泳淌度的研究     

齐红莉  於林芬  盖宏伟  吴垠  桂远明 《天津农学院学报》2004,11(3):24-27

以单细胞成像法测量了经功夫菊酯攻毒处理的水质净化剂组和无水质净化剂组的杂交鲤鱼红细胞在塑料(polymethal methacrylate,PMMA)微流控芯片上的电泳淌度。认为功夫菊酯攻毒处理后水质净化剂组和无水质净化剂组均使鲤鱼红细胞电泳淌度有明显改变，但前者增加幅度低于后者。红细胞电泳淌度可作为环境毒理检测指标，为今后毒理学研究奠定一定的理论基础。  相似文献   

L-肉碱强化卤虫对鲤鱼开口苗脂肪酸组成和C/N比率的影响          下载免费PDF全文

陈玉珂  蔺丽丽  宋丹 《西北农林科技大学学报(自然科学版)》2011,39(6):31-36

【目的】研究L-肉碱强化卤虫对鲤鱼开口苗脂肪酸组成和C/N比率的影响,为鲤鱼开口苗的饲养提供参考。【方法】分别用质量浓度为0(对照),1,100,1 000 mg/L的L-肉碱强化卤虫无节幼体(Artemiasp.)12和24h,然后投喂给鲤鱼(Cyprinus carpio)开口苗,21 d后测定鱼苗的脂肪酸组成和C/N比率。【结果】投喂L-肉碱强化12 h的卤虫时,1 mg/L L-肉碱处理组鲤鱼开口苗的∑C14-24脂肪酸含量、饱和脂肪酸含量和单不饱和脂肪酸含量较对照组显著降低(P<0.05);1 000 mg/L L-肉碱处理组鲤鱼开口苗的单不饱和脂肪酸含量较对照组显著升高(P<0.05);L-肉碱对鲤鱼开口苗的多不饱和脂肪酸含量、∑n-3+∑n-6和∑DHA+EPA含量均无显著影响(P>0.05);1 000mg/L L-肉碱处理组鲤鱼开口苗的C/N比率显著低于对照组和1 mg/L L-肉碱处理组(P<0.05)。投喂L-肉碱强化24 h的卤虫时,1和100 mg/L L-肉碱处理组鲤鱼开口苗的∑C14-24脂肪酸和饱和脂肪酸含量较对照组显著降低(P<0.05),但2组之间差异不显著(P>0.05);1 000 mg/L L-肉碱处理组鲤鱼开口苗的∑C14-24脂肪酸和饱和脂肪酸含量较对照组显著升高(P<0.05);1 mg/L L-肉碱处理组鲤鱼开口苗的单不饱和脂肪酸含量较其他3组显著降低(P<0.05),多不饱和脂肪酸、∑n-3+∑n-6和∑DHA+EPA含量与对照组差异不显著(P>0.05);100 mg/L和1 000 mg/L L-肉碱处理组鲤鱼开口苗的多不饱和脂肪酸、∑n-3+∑n-6和∑DHA+EP A含量较对照组显著升高(P<0.05),且2组之间差异显著(P<0.05);1,100 mg/L L-肉碱处理组鲤鱼开口苗的C/N比率较对照组和1 000 mg/L L-肉碱处理组显著降低(P<0.05)。【结论】本试验条件下,以质量浓度100 mg/L L-肉碱强化卤虫24 h后再投喂鲤鱼开口苗,可显著改善鲤鱼开口苗的脂肪酸组成和C/N比率。  相似文献   

锌、硼对生姜（Zingiber　officinale　Rose．）的增产效果及吸收、分配规律的研究     

王晓云  程炳嵩  张国珍 《山东农业大学学报(自然科学版)》1994,(1)

本试验的姜田土壤经测定有效锌含量为０．６５ｐｐｍ，有效硼含量为０．３２ｐｐｍ。单纯施锌（硫酸锌）增产２４．０％，同时施锌和硼（硼砂）增产３８．９％。施锌后提高了生姜植株各器官的锌浓度；累积吸锌量也有大幅度提高；植株的锌主要在生育后期吸收；施锌还增加生育后期锌在根状茎中的分配。施硼主要提高了生姜叶片中的硼浓度；累积吸硼量也有大幅度提高；施硼还增加了硼在叶片中的分配比例。  相似文献   

天津地区常见草坪病虫害的防治   总被引：3，自引：0，他引：3  

张洁  王俊礼  党红岩  王秀香 《天津农学院学报》2006,13(4):43-46

综述了天津地区几种常见的草坪病虫害的症状、发生规律、危害,介绍了这几种病虫害的防治方法。  相似文献