不同eui基因对杂交稻干物质积累的影响

分别取带有eui1(t)、eui2(t)基因的长穗颈不育系及其对照2对,以及带有eui1(t)基因的恢复系及其对照2对,以不完全半双列杂交方式组配成遗传背景一致、但eui基因型不同的一套4组共16个F1材料,采用随机区组设计,对其干物质积累进行研究。结果表明:含有eui基因使杂交稻的茎、叶干物质生产能力增强,且以eui1(t)基因效果最大,eui2(t)基因效果不显著,而同时含有eui1、2基因的效果则相当或略小于eui1(t)基因;eui基因对穗干物质重影响较小;e-杂交稻的群体生长率也比不含eui基因的对照高,以eui1(t)基因的作用最为显著,作用强度依次为:eui1(t)>eui1(t)+eui2(t)>eui2(t),eui基因对杂交稻群体生长率增加作用主要是在生长前期和中期。eui基因对物质输出和转化影响较小。     

Inflammatory Response of Healthy Horses Subjected to Small Colon Enterotomy and Treated or Not With Heparin

The acute phase response is a response to injury and depends on the severity of the trauma. Heparin is routinely used for postsurgical treatment of horses to prevent abdominal adhesions; however, its effect on inflammation is unknown. This study aimed to assess systemic inflammatory response of horses subjected to small colon enterotomy and to evaluate heparin effects on postsurgical inflammation. Ten adult horses were subjected to small colon enterotomy and were assigned to a control or a treatment group. Both groups received prophylactic antibiotics and flunixin, and the treatment group received 150 IU/kg heparin subcutaneously after surgery and every 12 hours for five days. WBC counts, peritoneal fluid evaluation, determination of serum and peritoneal haptoglobin (Hp), and serum amyloid A (SAA) were performed before, 12 hours, and 1, 2, 4, 6, 10, and 14 days after enterotomy. Forty-eight hours after surgery, a significant increase in serum Hp was observed in the control group, and SAA concentrations increased significantly in the both groups between 24 hours, 48 hours, and 4 days after surgery. The SAA and serum Hp concentrations produced no significant differences between the groups. Peritoneal Hp increased significantly in the control group 4 days after surgery and was significantly higher in the control group than in the treated group 14 days after surgery. Serum Hp and SAA identified the acute phase response changes faster, however, were not able to identify differences between groups. Peritoneal Hp concentrations identified inflammatory differences between the groups 14 days after surgery; the difference suggests that heparin may act decreasing inflammation.     

不同pH和氮素形态对作物幼苗生长的影响

在pH 4.0和6.0的条件下研究铵态氮(NH4 -N)和硝态氮(NO3--N)对玉米、白羽扇豆、水稻和小麦幼苗生长的影响。结果表明:不同介质pH和氮素形态均能对玉米、白羽扇豆、水稻和小麦幼苗的干物质积累和体内的分布产生影响。就玉米而言,不论供应何种形态的氮素,低pH均明显有利于干物质的积累,但低pH条件下NH4 -N最不利于小麦干物质积累;而对水稻来说,低pH条件下供应NO3--N最不利于干物质积累。pH 6.0条件下玉米、白羽扇豆和小麦3种植物均显示出较大的根冠比,表明较高的pH条件有助于同化产物向根部的运输和在根部的积累。     

小豆生长发育规律研究 Ⅹ．小豆群体干物质生产与产量形成的关系

以JN2、JN5、JN6、JN7等4个不同粒型的红小豆品种为材料,研究了小豆群体干物质生产与产量形成的关系。结果表明:(1)夏播小豆的群体生产量变化表现为前期增长慢,从8月中旬开始快速增长。(2) JN2、JN5、JN6、JN7在开花期最适宜的干物重积累量分别为368．64、339．66、354．72和406．08 kg/hm2,生育后期干物质积累JN2为6 241．36 kg/hm2时产量最高,而其他3个品种后期累积量在4 000 kg/hm2左右即可达到预期目标。(3)开花期的叶面积指数,JN2应控制在6-7之间,JN6控制在4-6之间,JN5控制在4左右, JN7控制在3左右为最适,产量较高。(4)在中等肥力大田生产条件下,JN2适宜高密度(36万株/hm2)种植, JN5和JN7适宜中低密度(18万株/hm2)种植,JN6适宜中高密度(24万株/hm2)种植。     

水稻不同氮肥量水平下铜肥肥效的研究

本文研究了微量元素铜在同样的氮肥量水平下对水稻生育的影响。结果表明,在氮、磷、钾配合施用的基础上,适量施用铜肥,可提高氮肥利用率,增加有效分蘖率,减少空秕率,提高抗稻瘟病、抗倒伏能力和产量。铜肥不仅促进水稻的氮素吸收,还促进氮素同化利用,氮肥量水平高时更为明显。