共查询到20条相似文献，搜索用时 78 毫秒
1.
抗大豆胞囊线虫4号生理小种新品系的选育 总被引：6，自引：2，他引：6
采用兼抗大豆胞囊线虫１，３，４，５号生理小种的兴县灰布支黑豆，五寨赤不流黑豆和应县小黑豆等抗源与生产上广泛应用的优良品种杂效，经多年选择培育，获得１４个抗大豆胞囊线虫４号小种的黄粒新品系，历年鉴定，抗性稳定，根系胞囊平均在１０个以下，其中１０个品系根系胞囊在３以下，属高抗材料，并且表现直立不倒，百粒重比抗源亲本提高５０％以上，产量大大提高，折合产１２５－１５０ｋｇ，均超过抗源亲本的１０－１５％，接 相似文献
2.
3.
大豆种子抗劣变性的鉴定方法研究 总被引：3，自引：0，他引：3
以抗种子劣变性不同的５个栽培大豆和５个野生大豆品种为材料，比较了高温湿（相对湿度１００％，温度４０℃）条件下贮藏３天、７天、１０天和１４天及２０％的甲醇浸泡２小时等５种种子加速第化方法鉴定了种子抗劣变性的效果。结果表明，高温高湿老化７－１０天和２０％的甲醇浸泡２小时，可鉴定出大豆种子抗劣变性。 相似文献
4.
5.
棉花双抗新品系８６－６号抗黄萎病、兼抗枯萎病棉花新品系８６－６号（原编号８８０３１）是中国农科院植保所与河南新乡县小冀镇王屯科技组合作，１９８５年以中１２为母本，以８６－４号为父本杂交，在枯、黄萎混生病圃经多年连续选择育成的，为“八五”攻关科技新成果... 相似文献
6.
抗盐碱罗布麻DNA导入棉花的研究 总被引：13，自引：1，他引：13
利用微注射技术，把抗盐碱罗布麻ＤＮＡ导入鲁棉６号。对其后代经人工配制的盐碱土筛选育成了两个耐盐碱品系９１－１１和９１－１５，在含盐量为０．５１％的滨海盐碱地种植，其皮棉产量分别比受体亲本鲁棉６号增产１９１．７％和２３７．８％。对９１－１１和鲁棉６号在盐胁迫条件下测定其细胞质膜透性和超氧化物歧化酶（ＳＯＤ）活性，结果表明，９１－１１在盐胁迫条件下能够维持较高的ＳＯＤ活性和较稳定的膜透性，而鲁棉６号呈现相反的变化，而且差异显著。据此说明，应用这一技术能够筛选出含有抗性基因的改良品种。 相似文献
7.
本研究是“七五”期间鉴定的继续和深入，通过５年的抗病虫鉴定、多年多点鉴定以及室内生理小种和抗生性测定，选出单抗病虫材料１７０６份、双抗３６３份、三抗１０７份、四抗６份，以及嘉农籼育３６、安选４号等１５份抗性较为稳定并兼抗多种病虫的品种供育种和生产部门利用 相似文献
8.
9.
１ 水稻１．１ 辽盐９号：北方农业技术开发总公司选育,１９９７年辽宁省审定。在辽宁全生育期１５７ｄ左右,与中丹２号同熟期。米质主要指标均达到部颁优质粳米一级标准。对稻瘟病、稻曲病、纹枯病均为中抗以上,并具有耐肥、抗倒、耐盐碱、耐旱、耐寒及活杆成熟、不早衰等特性。１９９６年至１９９７年北方稻区试单产４８８．０ｋｇ／６６７ｍ２,比对照中丹２号增产１０．８％。１９９８年北方稻生产试验单产４７６．７ｋｇ／６６７ｍ２,比对照增产４．４％。适宜在辽宁、西北及华北中丹２号熟期稻区种植。１．２ 辽盐糯１０号：北… 相似文献
10.
11.
旨在阐述多样性种植模式对于糯高粱农艺性状、生理特性的影响及防控高梁炭疽病的效果,为推广糯高粱栽培技术和防控高梁炭疽病进一步提供理论依据。采用糯高粱与大豆、花生间套作,同时应用隔年换带轮作技术,结果表明：与单作糯高梁比,多样性种植模式对糯高梁的穗长、千粒重、穗粒重等农艺性状有一定影响;多样性种植模式对糯高粱开花期的净光合速率、蒸腾速率、气孔导度、胞间CO2浓度等光合特性有显著性影响;多样性种植模式对高梁炭疽病发病株率、病情严重度分级、病情指数有显著性影响;对高粱炭疽病的防控,A2B2种植模式相对防控效果最好,高达71.95%。糯高梁与大豆、花生间套作的多样性种植模式对糯高粱生长有影响,能够提高糯高粱光合能力,有效控制高梁炭疽病的发生,对大面积生产具有较大的利用价值。 相似文献
12.
Intercropping of sorghum and pearl millet with different growth cycles is used widely in third-world countries to ensure and increase yields. However, it is questionable whether yield increases because of intercropping can be maintained under more developed systems, since temporal differences are necessary to allow mechanized planting and harvesting.
Three sorghum hybrids with expected growth cycles from 90 to 110 days were planted in sole stands and in alternate rows and mixed within the rows with a pearl millet hybrid having a growth cycle similar to that of the early sorghum. Sole stands of millet also were included. The plots were planted at three locations in Kansas, two dryland and one including dryland and irrigated. Results show that yields were consistently highest in sole stands of sorghum, owing to the higher yield level of sorghum. No yield increase could be found on a land equivalent ratio basis, indicating no intercropping advantages. However, under good moisture conditions, a tendency toward yield increase was observed with the later maturing sorghums, which had 1–2 weeks of grain filling after the millet was mature. When moisture supply was insufficient, millet showed higher competitiveness for water than sorghum, and sorghum was adversely affected more than pearl millet was favored. It was concluded that moisture conditions have to be good and that temporal differences between sorghum and millet have to be greater than those used in this experiment to achieve intercropping yield advantages. 相似文献
Three sorghum hybrids with expected growth cycles from 90 to 110 days were planted in sole stands and in alternate rows and mixed within the rows with a pearl millet hybrid having a growth cycle similar to that of the early sorghum. Sole stands of millet also were included. The plots were planted at three locations in Kansas, two dryland and one including dryland and irrigated. Results show that yields were consistently highest in sole stands of sorghum, owing to the higher yield level of sorghum. No yield increase could be found on a land equivalent ratio basis, indicating no intercropping advantages. However, under good moisture conditions, a tendency toward yield increase was observed with the later maturing sorghums, which had 1–2 weeks of grain filling after the millet was mature. When moisture supply was insufficient, millet showed higher competitiveness for water than sorghum, and sorghum was adversely affected more than pearl millet was favored. It was concluded that moisture conditions have to be good and that temporal differences between sorghum and millet have to be greater than those used in this experiment to achieve intercropping yield advantages. 相似文献
13.
高粱(Sorghum vulgare Pers.)营养器官中的硅质细胞与硅质体 总被引：2，自引：0，他引：2
本文着重讨论高粱硅质细胞的形态、排列方式和分布数量。幼苗三叶期的幼叶硅质细胞为葫芦形,排列成1—2行。成长植株的中、高位叶硅质细胞成马鞍形,通常与栓质细胞成对,与长细胞相间排列成多种图形。硅质细胞分布数量:低位叶少,中、高位叶增多;叶下表皮多于上表皮;尤以贴叶脉下表皮、主脉下表皮、大平行侧脉下表皮多于其它部 相似文献
14.
高粱与苏丹草杂种优势利用的研究 总被引：33，自引：3，他引：30
高粱与苏丹草杂种优势明显,F1单株生物产量性状高于双亲平均值,甚至超过或接近高亲。影响高粱-苏丹草杂交种单株茎叶鲜重的主要因素是主茎粗、叶长;决定单位面积鲜草产量的主要是密度、叶长和单株茎叶鲜重。多年随机区组试验结果表明,杂交种单位面积鲜草产量显著超过苏丹草,并以30万株/hm2为最适种植密度。杂交种营养品 相似文献
15.
高粱种子的发芽试验比较难做，特别是新收获时，很难掌握其发芽率。为此，我们对发芽方法进行了分析研究。
高粱种子难发芽的主要原因是因为高粱种最忌湿度过大。湿度过大，种子呼吸速度减慢，造成种子顶芽初生感染引起腐烂，最终坏死。针…… 相似文献
16.
17.
18.
Perspectives of Sorghum in Europe 总被引：4，自引：0，他引：4
This paper attempts to review the present status and offers a perspective on sorghum [Sorghum bicolor (L.) Moench] use and breeding in Europe. Topics such as botany, origin, utilization, agronomic performances and improvement of sorghum are discussed. Clearly, producers and users of sorghum should be more familiar with the crop so that they can take advantage of some of the unique characteristics that are associated with sorghum as it relates to Europe. 相似文献
19.
20.
高梁基因组学研究进展 总被引：1，自引：0，他引：1
高粱是世界上最主要的禾谷类作物之一,是日趋重要的生物燃料作物。同时,它也是一种最有害的杂草的先祖,是许多具有复杂基因组的热带草的植物学模型,开展其基因组学研究具有重要意义。目前已经构建了高粱种内和种间的遗传图谱,完成了高粱全基因组的测序,这为探索高粱基因和功能的对位提供了保障。笔者对高粱基因组遗传图谱、物理图谱及基因组特征、序列分析、QTL定位及关联遗传学等几方面的研究进展进行了整理和总结,为开展相关研究工作及想了解相关信息的广大学者提供了参考信息和研究方向的建议。 相似文献