特早熟扁豆新品种‘湘扁豆1号’   总被引：1，自引：0，他引：1  

彭友林  李密  唐纯武  王新明 《园艺学报》2001,28(5):480-480

 ‘湘扁豆1 号’为特早熟扁豆新品种, 鲜荚上市比常规品种早95 d 以上, 商品性好, 质脆嫩, 品质优; 植株生长势强, 能密植高产, 产量高达42 000 kg/ hm² ; 抗病性强, 较耐寒, 适宜长江中、下游及以南地区作特早熟品种栽培。  相似文献   

黑穗醋栗果实成熟过程主要营养成分变化规律   总被引：12，自引：2，他引：10  

杨咏丽  崔成东 《园艺学报》1994,21(1):21-25

黑穗醋栗果实的各种营养物质，在整个发育成熟过程中，各阶段的变化不同。薄皮和厚皮两品种表现出相同的变化规律。果实内总糖含量随果实成熟逐渐增加，果实成熟后略有减少，总糖中以果糖和葡萄糖为主；有机酸含量随果实成熟逐渐减少。接近成熟时增长缓慢；维生素Ｃ、氨基酸的相对含量的幼果中最多，随着果实的成熟逐渐减少。氨基酸在果实成熟时相对含量最低，其后略有增加；而维生素Ｃ则一直下降，果实成熟时下降缓慢。相关分析表明  相似文献   

来源和质量不同对山羊卵母细胞体外成熟率的影响     

刘海军  马群  王儒  郑梓  张文昌 《华北农学报》2012,27(2):117-120

比较了卵母细胞级别对体外成熟率的影响,以及促卵泡素(FSH)处理山羊对卵母细胞采集的数量和质量的影响。结果表明:卵母细胞级别对体外成熟率有显著影响,不论是来源于FSH处理卵巢还是屠宰场卵巢,均是A、B级卵母细胞的成熟率高于C级卵母细胞,差异极显著(P<0.01)。但是A、B级卵母细胞之间差异不显著;卵巢来源对卵母细胞采集的数量和质量有显著影响,A、B级卵母细胞在获卵总数中所占的比例,平均每个卵巢获卵母细胞数及A、B级卵母细胞数,均是FSH处理卵巢高于屠宰场卵巢,差异显著(P<0.05);卵巢来源对卵母细胞体外成熟率有显著影响,来自于FSH处理卵巢的卵母细胞体外成熟率高于屠宰场卵巢(81.6%比67.6%),差异极显著(P<0.01)。  相似文献   

种植密度对东北特早熟棉区棉花生物量和氮素累积的影响   总被引：6，自引：2，他引：4  

王子胜  吴晓东  郭文琦  徐敏  那艳斌  张雷  周治国 《棉花学报》2012,24(1):35-43

 以辽棉19号（生育期125 d）和新棉33B（生育期135 d）2个生育期差异较大的品种为材料,于2007－2008年在东北特早熟棉区（辽宁辽阳,41°26' N,123°14' E）设置棉花种植密度试验（7.50万、9.75万、12.00 万株·hm^-2）,研究不同棉花群体生物量与氮素动态累积特征的差异及其与产量品质形成的关系。结果表明,棉花群体生物量和氮素累积动态随生育进程的变化符合“S”型曲线,棉花群体生物量和氮素存在异速累积现象,氮素累积快速起始期及终止期均较生物量累积提前10 d左右。2品种均以9.75 万株·hm^-2密度下棉花生物量、氮素动态累积过程最为优化,皮棉产量最高,纤维品质最优;密度过高尽管群体生物量、氮素累积量较高,但经济产量下降。  相似文献   

The maturation of Pinus sylvestris seeds in relation to temperature climate in Northern Finland     

《Scandinavian Journal of Forest Research》2012,27(1-4):243-249

The probability of achieving an anatomically mature seed crop of Scots pine (Pinus sylvestris L.) in Northern Finland has been studied on the basis of earlier data and meteorological observations. The meteorological data over the period of 1951–1980 was used to calculate the probability of having a mature seed crop in various parts of Northern Finland. The climatic variables used were: (a) June‐August mean temperature (b) June—September mean temperature, and (c) annual temperature sum (+5°C base temperature). A non‐linear relationship between the percentage of mature seeds in a seed crop and the annual temperature sum was detected, indicating that 50% mature seed crop was achieved at appr. 890 degree days. The results suggest that the probability of having 50% mature seed crop is approximately 0.02–0.03 near the polar timber line. The probability of the occurrence of such years is, however, considerably higher in lowlands and lake districts even near the timber line.  相似文献   

Rooting Success of Cuttings from Young Picea abies in Transition to Flowering Competent Phase     

《Scandinavian Journal of Forest Research》2012,27(6):498-504

Abstract

Abundant flowering occurred in a central Swedish trial with 10-yr-old Picea abies L. (Karst.) cuttings, taken on 4-yr-old seedlings. Large deviations in cone-set between clones were assumed to reflect different stages in transition from juvenile to flowering competent phase. Rooting success and first-yr growth performance (leader length, leader origin and plagiotropic growth) were studied on cuttings originating from the upper and lower parts of the crown in 15 clones with heavy cone-set and 15 clones without cones. Twigs from the lower part of the crown had a significantly higher rooting percentage. Cone-set did not have an effect on any of the variables analysed. The results suggest that flowering ability and rooting capacity are independent age-related processes, implying that selection for high rooting capacity in clonal forestry does not reduce flowering competence. The results will have a great impact on breeding of P. abies, since both early flowering and high rooting ability are important traits for reducing the turnover time of the breeding cycle.  相似文献   

猪卵泡卵母细胞的体外成熟与体外受精     

徐小波  周晓龙  于建宁  王公金 《养猪》2012,(3):36-38

本试验对猪卵泡卵母细胞不同体外成熟培养时间、不同精子获能时间、不同精卵共孵育时间对体外受精的影响进行了研究。结果表明,体外成熟培养44 h左右,精子获能时间在1～2 h之间,精卵共孵育时间在6～8 h之间,受精后卵裂率最高。  相似文献   

Distribution of protein disulfide isomerase during maturation of pig oocytes     

Yumi OHASHI  Yumi HOSHINO  Kentaro TANEMURA  Eimei SATO 《Animal Science Journal》2013,84(1):15-22

Oocyte maturation in mammals is characterized by a dramatic reorganization of the endoplasmic reticulum (ER). In mice, the ER forms accumulations in the germinal vesicle (GV) stage and distinctive cortical clusters in metaphase II (MII) of the oocyte. Multiple evidence suggests that this ER distribution is important in preparing the oocyte for Ca²⁺ oscillations, which trigger oocyte activation at fertilization. In this study, we investigated the time course and illustrated the possible functional role of ER distribution during maturation of porcine oocytes by immunostaining with protein disulfide isomerase (PDI). PDI forms clusters in the cytoplasm of oocytes. After immunostaining, PDI clusters were identified throughout the cytoplasm from the GV to metaphase I (MI) stage; however, at the MII stage, the PDI formed large clusters (1–2 µm) in the animal pole around the first polar body. PDI distribution was prevented by bacitracin, a PDI inhibitor. Our experiments indicated that, during porcine oocyte maturation, PDI undergoes a dramatic reorganization. This characteristic distribution is different from that in the mouse oocyte. Moreover, our study suggested that formation of PDI clusters in the animal pole is a specific characteristic of matured porcine oocytes.  相似文献   

Effect of L‐carnitine on maturation,cryo‐tolerance and embryo developmental competence of bovine oocytes     

Teewara Phongnimitr  Yuanyuan Liang  Kanokwan Srirattana  Kanchana Panyawai  Nucharin Sripunya  Chatchai Treetampinich  Rangsun Parnpai 《Animal Science Journal》2013,84(11):719-725

In this study, the effects of the addition of L‐carnitine in in vitro maturation (IVM) medium for bovine oocytes on their nuclear maturation and cryopreservation were investigated; they were matured in IVM medium supplemented with 0.0, 0.3, 0.6 and 1.2 mg/mL of L‐carnitine (control, 0.3, 0.6 and 1.2 groups, respectively) and some of them were vitrified by Cryotop. Moreover, the effects of L‐carnitine during in vitro fertilization (IVF) and in vitro culture (IVC) on the developmental potential and quality of IVF embryos were also examined. A significantly higher maturation rate of oocytes was obtained for 0.3 and 0.6 mg/mL groups compared with the control (P < 0.05). The blastocyst formation rate in the 0.6 group was significantly improved, whereas the rate in the 1.2 group was significantly decreased when compared with the control group (P < 0.05). No significant difference was found in embryo development between the control and the L‐carnitine group after oocyte vitrification. Supplementation of IVF and IVC media with L‐carnitine had no effect on development to the blastocyst stage of IVM oocytes treated with 0.6 mg/mL L‐carnitine. In conclusion, the supplementation of L‐carnitine during IVM of bovine oocytes improved their nuclear maturation and subsequent embryo development after IVF, but when they were vitrified the improving effects were neutralized.  相似文献   

牛卵丘细胞对卵母细胞体外成熟与孤雌发育的影响   总被引：1，自引：0，他引：1  

张锐  章孝荣  陶勇  张运海  章美玲 《中国畜牧杂志》2008,44(7):12-15

试验以牛卵泡内卵丘-卵母细胞复合体(COCs)为材料,探讨了牛卵丘细胞包裹程度对卵母细胞体外成熟(IVM)和孤雌胚胎(PAEs)发育的影响。试验1,将COCs随机分为2组,在开展IVM前,将其中一组COCs的卵丘细胞机械吹打去除成为机械裸卵(DOs),研究卵丘细胞层存在与否对卵母细胞体外核成熟(排出第一极体)和孤雌激活后发育能力的影响;试验2,根据COCs卵丘细胞包裹层数将COCs分为3组,即卵丘细胞层少(1～4层)的COCs为A组、卵丘细胞层多(5层以上)的COCs为B组及包裹5层以上卵丘细胞且附带卵泡壁颗粒细胞层(FSP)的COCs为C组,研究卵丘细胞层包裹程度对卵母细胞的体外核成熟和孤雌激活后胚胎发育能力的影响。结果表明:卵丘细胞的存在更有利于卵母细胞体外成熟和孤雌胚胎发育;COCs中卵丘细胞包裹层数对卵母细胞体外核成熟率没有显著影响,但包裹卵丘细胞层数多且附带FSP的卵母细胞,其PAEs的囊胚率显著高于包裹卵丘细胞少的卵母细胞PAEs。  相似文献