赤霉素对枣花繁殖生物学特性的影响     

阿布都卡尤木·阿依麦提  樊丁宇  郝庆  曾斌  张翔飞  余镇藩  唐义莲 《新疆农业科学》2020,57(2):283-291

【目的】 研究赤霉素对枣花繁殖生物学特性的影响,为生产上赤霉素的科学应用提供理论依据。【方法】 以灰枣和骏枣的鲜花粉为材料,于盛花期喷施赤霉素(GA₃)处理,采用离体培养基,I-KI(碘-碘化钾)染色法,联苯胺-过氧化氢法测定,分析赤霉素对红枣花粉萌发和活力特性的影响。【结果】 低浓度(10~30 mg/L)赤霉素对灰枣和骏枣花粉萌发率、花粉管长度、花粉活力、花粉量和柱头可授性有较显著的促进作用。随着赤霉素浓度的升高,对花粉的萌发特性产生抑制作用;赤霉素处理后7 d的花粉萌发率和花粉活力跟对照没有显著差异。【结论】 枣花粉萌发、花粉管长度、花粉量和花粉活力特性,对外源赤霉素的响应表现为低浓度促进,高浓度抑制作用。  相似文献   

环境温度对发酵床养殖公猪繁殖性能的影响     

刘金林  李兆龙 《福建畜牧兽医》2022,(1)

微生物发酵床养殖是一种生态养殖模式,在冬天具有很好的保暖作用,减少了日粮的损耗,但在夏天,缺少散热的功能,对育肥猪和种猪的养殖影响较大。实验对某微生物发酵床生态养猪场的4头种公猪,通过连续观测公猪舍环境温度、垫料温度及公猪的精神状态,检测公猪血液生化指标、精子活率、精子质量、精子密度及生化指标项目。结果发现1号公猪的总蛋白水平较高,其它生化指标差异不显著;4头公猪中只有4号公猪精子活率达到70%,其余公猪精液中精子活率低于10%,大量死精。结果表明微生物发酵床养殖对公猪繁殖性能的影响较大。  相似文献   

农业科研院所激发人才创新活力的实践探索——以中国农业科学院茶叶研究所为例          下载免费PDF全文

任淑敏  李书魁 《农业科研经济管理》2023,(4):44-47

人才是第一资源，只有充分激发各类人才创新活力才能将人才优势转化为发展优势。文章以中国农业科学院茶叶研究所为例，分析农业科研院所在统筹推进学科、项目、平台、人才“四位一体”建设，强化三链一体布局的主要做法，总结存在的问题，并据此提出强化使命牵引的制度安排、持续推动“产业链－创新链－人才链”协同融合、系统提升有利于创新创造的激励机制、全面提升条件平台支撑能力等激发科研人才创新活力的具体对策和建议，以期为农业科研院所激发人才创新活力提供借鉴。  相似文献   

Soil water stress at young urban street-tree sites in response to meteorology and site parameters     

《Urban Forestry & Urban Greening》2022

Growth conditions at urban street-tree sites are unfavorable and tree vitality is increasingly threatened by water scarcity due to changing climate. Developing adaption and management strategies to ensure early stage and long-term tree- and root growth requires thorough knowledge about root zone soil-water dynamics at young urban street-tree sites. Therefore, we established a soil water potential (SWP) monitoring at 17 young urban street-tree sites in the city of Hamburg, Germany. Over four years (2016–2019) we measured and quantified critical soil water availability in the root ball, planting pit, and surrounding urban soil using a threshold value (SWP < −1200 hPa) and assessed the tree sites sensitivity towards meteorological variables, tree- and site characteristics using a data driven random forest model. During 2018 and 2019, average critical soil water availability in the root ball and planting pit occurred between three to five months per year, and the trees were exposed to prolonged periods of critical soil-water availability for two consecutive years. After planting, critical soil water availability increasingly shifted year wise from the root ball into the entire planting pit as a consequence of root development and increasing water demand of the trees. Considering less usable water within the surrounding sandy soils, soil water in the planting pit may be depleted earlier and more rapidly with tree aging. The random forest model successfully predicted critical soil water availability and identified tree age as an important predictor. Long-term (10-day) rainfall was the most important variable predicting the occurrence of critical soil water availability, suggesting a further extension of periods with critical soil water availability as rainy summer days are projected to decrease with climate change. Additionally we identified soil temperature as a more important predictor than air temperature as it reflects site specific characteristics affecting water- an energy balance. This study underlines the urgency to adapt the growing conditions of young urban street-trees in terms of sufficient water storage, and provides an approach for future application in tree site soil water management, to maintain their vitality under urbanization pressure and climate change.  相似文献