“复激保果剂”在杂交水稻制种上应用技术总结

复激保累剂,在杂交稻制种上使用,能促使花器发育良好,调节父母本花期,提高结实率,增加每穗实粒和粒重,提高产量。且成本低,有显著的经济效益。     

苹果采前落果与内源激素的关系

为了探讨苹果采前落果与内源激素之间的关系,在采前8周间定期测定了不同苹果品种的果柄、果台和离层形成部位组织中IAA、ABA含量;在采收前20d内定期测定了离层部位组织中细胞壁分解酶(Cellulase)的活性;在收获期测定了果实乙烯的发生量。结果表明:不同品种果柄、果台和离层部位组织中IAA和ABA含量变化有差异,但它们变化的总趋势相似,都是随着果实成熟IAA含量下降,而ABA含量上升;不同品种的成熟果实中乙烯发生量有很大差异,以落果多的品种显著大于落果少的品种;采前落果重的品种离层部位组织中细胞壁分解酶的活性在果实成熟期急剧增加。由于果实进入成熟阶段后,IAA含量下降,ABA含量升高,ABA/IAA之间的相对平衡被打破,高ABA/IAA以及高乙烯会刺激离层组织中细胞壁分解酶的活性增高,进而促进离层形成,这可能是导致落果发生的原因。     

饲粮中添加抗菌肽对肉鸭增重及血清尿素氮、总蛋白水平的影响

240只1日龄肉鸭随机成分4组,每组设3个重复,对照组用基础日粮,试验组在基础日粮上每千克分别添加1、2、3mL抗菌肽制剂。结果显示:1)2、3mL/kg添加量组增重效果显著(P<0.05),3mL/kg添加量组最佳;净肉率升高,达到显著水平(P<0.05),其中主要是胸肌率上升;腹脂率降低但差异不显著(P>0.05);料重比无显著变化(P>0.05)。2)血清总蛋白浓度差异不显著(P>0.05),但尿素氮浓度下降,2、3mL/kg添加量组达显著水平(P<0.05),3mL/kg添加量组最低。     

影响羊肉产量和品质的因素

本文综述了品种、饲料营养、饲养方式、性别、年龄、去势、屠宰等方面对羊肉产量和羊肉品质的影响,并提出建议。     

异黄酮植物雌激素在家禽生产中的作用

异黄酮植物雌激素广泛分布于植物界,其生理活性多种多样。它具有促进家禽生长,提高产蛋性能等作用,但对其作用机制目前尚未完全明确。本文综述了近年来有关异黄酮植物雌激素在家禽生产方面的研究概况。     

民勤绿洲生态气候资源及其利用

民勤绿洲边缘 ,光照丰富、温差大 ,有利于农产品质量的提高。但是水资源缺乏 ,地下水位急剧下降和土地沙化是民勤绿洲农业生产的首要问题。如何充分利用现有生态资源 ,并充分提高其利用率是摆在我们面前的一个主要课题。只有通过引进优良品种 ,调整农业种植结构 ,大力推广节水灌溉技术 ,才是解决上述问题的有效途径     

大白菜子叶离体培养再生植株

 探讨了植物激素、AgNO₃ 和琼脂浓度对大白菜子叶培养芽再生和植株再生的影响。结果表明:优化培养基条件为MS 培养基中加入5 mg / L BA、0. 5 mg/ L NAA、2 mg/ L AgNO₃ 和1. 2%~ 1. 6 %琼脂。培养过程中, 子叶的乙烯释放量对芽再生起很重要的作用, 具有高芽再生率的基因型或高浓度琼脂的培养条件下, 子叶产生的乙烯量较少。培养基中有AgNO₃ 存在时, 尽管子叶的乙烯释放量增加, 芽再生率也有提高。对子叶的乙烯释放量和不定芽再生的关系进行了讨论。     

两系稻制种穗期病害发生较重的原因及防治措施

调查分析稻粒黑粉病、穗颈稻瘟等两系杂交稻制种穗期主要病害的发生原因,提出了清除菌源、轮换制种、健身栽培、对口药剂防治等防治措施。     

Restoration of tuber production by exposure to unshaded daylight in Eleocharis kuroguwai Ohwi shaded during the early tuber formation period

The loss of final tuber weight of Eleocharis kuroguwai Ohwi by shading during the early tuber formation period (TFP) is overcome by exposure to unshaded daylight thereafter (late TFP). In the present study, the growth parameters that contribute to the dry matter increase (DMI) per day of tubers in the late TFP were examined. DMI of the tuber during the late TFP was determined by that of the whole plant and the ratio of the DMI of the tuber to that of the whole plant during this period. The ratio of the DMI of the tuber to that of the whole plant during the late TFP was significantly correlated with the DMI of the whole plant during the first 14 days of the late TFP. During the late TFP after the exposure to unshaded daylight, DMI of the whole plant correlated with the surface area of the stem (SAS) and net assimilation ratio (NAR), and the SAS correlated with the stem dry weight (DW) and specific stem-surface area (SSA). SSA negatively influenced NAR, but NAR was increased by unshading. During the late TFP after shading, the effect of the decrease of the stem DW due to shading on the DMI of the whole plant was mitigated by the large SAS and high NAR. These results indicate that the growth parameters that contribute to the DMI of tuber during the late TFP after exposure to unshaded daylight are SAS and NAR just after unshading, and SSA during this period.